Download Xerox 820 Service Manual

XEROX
820/820-II PROceSSOR
SERVICE MANUAL
600P84592
MAY, 1982
Prepared by:
Xerox Corporation
.
Office Products Division
Customer Service
Field Engineering
1341 W. Mockingbird Lane
Dallas, Texas 75247
Copyright@ 1982 by Xerox Corporation
.
Xerox® is a registered trademark of Xerox Corporation
Printed in USA
TABLE OF CONTENTS
1.0
GENERAL DATA
1.1
1.2
1.3
1.3.1
1.3.2
1.4
1.5
1.6
2.0
1-1
1-1
1-2
1-2
1-3
1-3
1-3
1-5
INSTALLA nON
2.1
2.2
2.3
2.4
3.0
How to Use this Manual
Specifications
Call Management. •
General.
••
Call Mlmagement Procedure •
Supplemental Tools and Supplies
Change Tag Index. • • •
Applicable Documents. • ••
•
4.0
Pre install Checkout •
Unpack Machine • •
Set Up. • • • • • • •
Installation Check List.
PL 4.1
PL 4.2
PL 4.3
PL 4.4
PL 4.5
PL 4.5
5.0
2-1
2-1
2-1
2-3
DISPLAY/PROCESSOR
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
Display/Processor Covers
CRT! PWA. • • • • • • ••
•
Powe'r Supply. • • • •
Main/Processor PWA
Power On/Off Switch • ••
•
Brightness Control •
6.0
3.2
KEYBOARD ASSEMBLY
3.2.1
3.2.2
3.2.3
Keyboard Covers • • • • • • • •
Keyboard PW A • • • • • •
Keyboard Harness Assemb.ly
3.3
DISK DRIVE ASSEMBLY(5.25")
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
Disk Covers • •
••
Disk Drive.
Head Load Pad •
Disk Drive Belt.
Disk Drive Harness •
3.4
DISK DRIVE ASSEMBLY (8")
3.4.1
3.4.2
3.4.3
3.4.4
Disk Drive Covers. ••
•
Disk Drive(s). • • • • • •
Load Pad, Single Side Disk Drive •
8" Disk Drive Power Supply. • • •
3.5
FIXED DRIVE ASSEMBLY (8" FIXED)
3.5.1
3.5.2
3.5.3
3.5.4
••••
•
Disk Covers
Disk Fixed Controller PWA.
Fixed Drive • ••
••
10 MB Control PW A. • •
•
10 MB Stepper PW A. ••
10 MB Disk Motor/Belt • •
Damper Assembly. • • • •
Fixed Disk Assembly Adjustments.
Interlock Switch ••
•••
3.5.5
3.5.6
3.5.7
3.5.8
3.5.9
3-3
3-5
3-6
3-6
7.0
8.0
3-9
3-9
3-13
9.0
3-17
3-19
Plug/Jack Location • • • • • •
Plug/Jack Terminal Identifieatior
Wire Run Lists • • • • ••
•
THEORY OF OPERAnONS
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
3-10
3-12
Introduction • • •
•
Level 1 Checkout Explanatiofl
Level 2 Checkout Explanation •
Level 1 Checkout Procedures. •
Level 2 Check Chart Procedures
Chain 1.1 AC/DC Power
Distribution.
•
PLUG/JACK UST
8.1
8.2
8.3
3-8
3-8
3-14
3-15
3-15
3-16
TROUf;U..ES1-IOOTING,
7.1
7.2
7.3
3-7
3-7
3-13
3-14
3-14
DlSPLAY QUAUTY
6.1
6.2
6.3
6.4
6.5
6.6
3-1
3-1
3-3
3-5
3-5
Display!Processor.
Keyboard Assembly •
Disk Drive Assembly
(5.25" SS/DS). • • • • • ••
Disk Drive Assembly (8" SS/DS) •
Disk Drive Assembly (e" Fixed)
8" Fixed Drive
••••••
N/A
REPAIR DATA
3.1
PARTS IDENTIFlCAnON
System Block; Diagrams
820!82o-ll. • • • •
Power Block Diagram. •
SA1403D Interconnect. •
General ••
•••
DC Power Supply.
•••
Processor (CPU) PWA ••
Daughter PW A • • • • • • •
Disk Drive Assembly (5.25" 55)
Disk Drive Assembly (8" 55)•••
5.25" and 8" Dual Sided
CRT Assembly
_.•
Keyboard Assembly • • •
14030 Disc Controller.
SAlo04 Fixed Drive •
S:P!M Introduction
SCHEMATIC DIAGRAMS
600P84592
GENERAL DATA
.L.
600P84592
1.1 How to Use This Manual
1.2
Changed
Illustration
I
I
~l
Ll HOW TO USE THIS MANUAL
The XEROX 820/820-II IP Processor MANUAL contains
the necessary information for service and maintenance.
The Service Manual is divided into the following Chapters:
Chapter 1. GENERAL DA TA
New
Illustrations
8lack vertical bar
t,) area changed.
Chapter 2. INSTALLATION
required
for
machine
I
Black vertical bar,
to art number.
i
If the same page is changed by a later revisio~, the
Contains information on the use of the service manual,
general specifications, change tag information, and
supplemental tools and supplies list.
Contains
information
installa tion.
Specificatiof\
I
identification marks will be removed and
identification marks added to the new information.
A new title page with a revision Control List will be
with each Change Package. This list will contain the
number of each changed or added page as well 2J
revision letter of that page. Pages not listed are or:·
or previous revision pages.
Chapter 3. REPAIR
Contains removal, replacement, and adjustment
procedures which are indexed by number to the related
parts list in Chapter 4 (Parts Identification).
Chapter 4.
BASIC SIGNS USED IN THIS MANUAL
F our signs are used to show areas or sections
iii':
Service Manual which have been affected by a tag crn
PARTS IDENTIFICAnON:
This sign is used to show a particular part:
area of a figure which has been modified b
the tag number within the circle.
Provides exploded views of all spared parts (and their
configuration) which are indexed to the item number
and description of the spared parts list. The following
codes are provided in Parts Identification to show that
a
Removal/Replacement,
Adjustment,
or
a
Removal/Replacement and Adjustment procedure is
provided in the Repair information.
This sign is used to show a particular part
area of a figure which has not been modi:'.,
by the tag number ~ithin .the circle.
This sign is used to show a tag change: he!
modified an area of the machine.
III
Remove/Replace
EI
Adjustment
[g
Remove/Replace and Adjustment.
This sign is used to show a tag change has
modi fied an area of the machine.
COMMENT SHEET USAGE
The number in the box is the number of the repair
procedure.
You can help improve the Service Manual by iderr
errors, providing input for improvements, and .tati1"l
reasons. A publication comment sheet is located
rear of this manual.
It contains instructiol
completion. An answer will be sent to you UpOf1 req
Chapter 5. DISPLAY QUALITY
1..2
NA
Chapter 6. TROUBLESHOOTING
Provides the troubleshooting approach which begins by
viewing all visual indicators in their normal sequence of
operation. Th" first incorrect visual indicator will provide access to a fault isolation/repair procedure.
.
MANUAL REVISION MARKS
Tables
Product Codes
820 Processor
820-II Processor (Floppy)
820-11 Processor (Fixed)
Keyboard Unit
Disc Drive Assembly (5.2S" SS)
Disc Drive Assembly (8" 5S)
Disc Drive Assembly (Fixed)
Disc Drive Assembly (5.25" OS)
Disc Drive Assembly (8" OS)
Dimensiol')S
Display/ControUer
Revision pages for the Service Manual tell of
configuration modifications. When a page is changed or
added, a revision letter on the bottom of the page wiU
identify it as a revised page. The actual change will be
identified as follows:
Text
SPECIFlCAnONS
Width
Depth
Height
Weight
(15.0")
(13.5")
(13")
(30 lbs)
I
Black vertical bar in
the left, margin.
Keyboard Unit
I
Black vertical bar left
of changed data.
Width
Depth
Height
Weight
(20.0")
(9.5")
(J.75")
(10 Ibs)
(38.lcm'
(34.3cm)
(33.0cm)
(J?6Kg)
(50.gcm)
(24.lcm)
(9.5cm)
(4.5Kg)
US
927
U03
U05
928
92~
973
U07
T66
FlO
1. GENERAL DATA
1.2
1.2
Specifications
1.3 Call Management
600PB45
SPEClFlCAnONS
Disk Assembly 5.25"
Width
Depth
Height
~eight
Electrical
Voltage
(20.3cm)
8.0"
(22.8cm)
9.0"
(l7.0cm)
6.7"
10 lbs (4.5Kg)
13.0"
22.75"
11.25"
48lbs
220V-240V
193V-215V
242V-:2b4V
59HZ ,'!... O•.5HZ
(33.0cm)
A standard two pole, three wire grounded recepta
required.
(57.8cm)
(28.6cm)
(21.8Kg)
Environmental
50 0 to90oF
Temperature
Fixed Drive Assembly (8")
Width
Depth
Height
Weight
R.X.
Normal 115VAC
Minimum 90VAC
Maximum 132VAC
60HZ!0.5HZ
Disk Assembly 8"
Width
Depth
Height
Weight
u.s.
15.5"
(39.4 cm)
22.75" (57.8 cm)
11.25" (28.6cm)
'54lbs. (24.5 kq)
(loa to 32 0 C)
0
Humidity
15% to 85% at 78 F (250C)
Elevation
6,000 feet above sea level. (1800 Meter
1.3
(NON COl
CALL MANAGEMENT
Space Requirements
1..3.1 General
The minimum space requirements around the machine as
shown (Figure 1-1) are needed for both normal operator
functions and service maintenance functions.
The Call M.anagement procedure is to be performed I
every service call. Can Management will ensure th,
critical areas of the 820 are in specification and I
tional. Performance of Call Management will enab
level of service targets to be met, .assuming a r
territory alignment.
20" (5 0 em)
...
The materials listed in Table 1-1 are required to pe
the Call Management procedure.
Table 1-1 Call MenagernM'tt
[
~30"~~O[~Jj)' .
T
DISPLAY 1(7.6 em)
PROCESSOR
.
(7.) em)
Materiala
DISK
DRIVES
(7.6 em)
-JI 3.0"~1+-:..:::======::.....,I . . - _ - - . - J
KEYBOARD
!of-----+1S"__+!
~-=============:::::'-
(45.7 em)
---l- __
SERVICE AREA
oJ
Part No.
(USO)
(RXI
6015868
·6015547
1652
5.25"
Head Load Pod
Head Load Pad
B"
Anti-Static
6015747
Cleaner
8R90020
Film Remover
Drum Polishing
43P46
Paper
Clean-Ups (Box
of 50)
43P67
Cleaning Solvent
43P78
Oil Lo-l7
70H23
Paper Towel Pocket
35P2163
Lint Free Cloth
35Pl638
Wax Wiping Cloth
Cleoning Kit (SI/4)
73P80439
Cleaning Kit (8")
73P80400
43P80006
Cleaning Solution
3P8
'OOT9
8R9
4
4
600T9
'OOTS
8KS
35F
35F
13P8
73P8(
l.3P8
The Call Management steps are presented in a I
that will avoid backtracking and repeat operations.
PRINTER
Figure 1-1 Space Requirements
1-2
Remember, when performing a Call Manog :ment, :
in the customer's office. Try not to interrupt the
office operation. Keep your work area clean and '
as possible; do not scatter tools and parts around. (
of solvent-soaked towels in proper receptacle.
1
1. GENERAL DATA
1.5 Change Tag Index
600PW
The information in this manual is applicable to all
machines which have not been modified beyond the
standard indicated by the modification plates. Refer to
the appropriate modification leaflets for additional
information when a machine has been modified to a later
standard.
RX machines use a 10 digit serial number system
in which the digits underscored designate the
sequential change in number.
111 - XXXXXXX 820 Display Processor
(E 39)
NOTE:
All machines manufactured after January 1,
1982 will have l:n-XXXXXxx.
1.5.3 . Matrix Tag
The matrix tag for the 820/820-U Processor is
located on the top of the CRT support. Any retrofit
made to the machine must be marked on the matrix
tag. The matrix tag for the disk drive assembly and
the keyboard assembly are located on the bottom
cover of that particular assembly.
CHANGE TAG INDEX
PROCESSOR
TAGH
DISCRIPTION
1
2.0 Rom Level CPU PW A
Etch 2 Level CPU PW A (RXO)
2
B" DISK DRIVE BOX
1-4
TAG fI
DISCRIPTION
1
Universal AC Harness (RXO)
cu:r IN
131-:503-
600P84592
1.4 Supplemental Tools and Supplies
1.3 Call Management
1.4
1.3..2 CALL MANAGEMENT
PROCEDURE
Items marked with an asterisk (*) are to be performed
only once within a 6-month period.
Paragraph references in
procedures in Chapter 3.
A Call Management
Management procedure.
the
following steps are to
checklist
follows
the
SlPPLEMENTAL TOCX-S AN) Su>PLIES
Supplemental
Hire Tooi Kit
Supplemental
required to
Processor.
tools are in addition to the a50/860 I
(600T1391) and the 1700 Terminal Sel
Tools. The tools listed in Table 1-1
service the XEROX a20/a20-II SE
Table 1-1 Supplemental Tools
Call
XEROX 820/820-0 Processor
1.
Check connector panel and ensure connectors are
properly secured.
2.
Check display (CRT) alignment (3.1.2).
3.
Turn system power OFF.
4.
Remove top cover (3.1.1).
5.
Clean face of CRT with general purpose cleaner and
antistatic cleaner (6015747).
Clean back of CRT with wax wiping cloth.
*6.
1. GENERAL DA
1.5 Change Tag Ind:
600T1504
Loop Back Tool
73SXXXX
Diagnostic Dillc
'P-l/1730/630 Service Ml
600pa3475
Table_!:~ is
!.i
l!~t
of miscellaneous supplies.
Table 1-2 Consummables
NOTE:
Do not remove PWA unless necessary.
7.
Brush/clean PWA.
8.
Ensure connectors are properly seated.
9.
Replace head load pads if necessary (3.3.3/3.4.3).
10.
Install top cover' (3.1.1).
11.
12.
Turn system power ON.
13.
Run Diagnostics
14.
Operate system to ensure proper operation.
15.
Perform printer (fermin]1) periodic maintenance
(1700 series Communications Terminal Service
Manual).
Perform disc head cleaning procedure
provided on the head cleaning kit package.
12P422
99P3049
70aW1601
70aW9501
70aWSOOI
1..5
CHANGE TAG IN:>EX
~ •.5.1
Introduction (USC)
TY Wrap
Fuse, 2.SA (USO)
Fuse, 2.0 AMP (R)<
Fuse, 1.2SA (RXC
FUM, 4.0 AMP (R>
All significant changes to the machine, whic
installed in the factory or in the field, are ider
by a tag number and a priority letter. The~
listed in the Change Tag Index. The priority
change is designated as follows:
f
M-
mandatory
0-
optional
N-
not for field retrofit
!s
Also ~hown
the description of the change, kit I
assocIated WI th the change, and a list of serial num
mac~ines .affected by the change.
The type n
confIguratIon affected by the change is identi fled
product code preceding the serial number.
1•.5.2 Introduction (RX)
CALL MANAGEMENT CHECKLIST
All significant changes to the machine, whic
installed in the factory or in the field, ant ider
by a tag number and a priority letter. The:
listed in the Change Tag Index. The priority I
change is designated 8S follows:
1.
Ensure connectors on connector panel are secure.
Class 1
2.
Check display (CRT) alignment.
3.
Remove top c,over.
Modifications
must be made
field immediat
parts
are
available.
4.
Clean face of CRT.
Class 2
s.
Clean back of CRT.
Modifications IT
the field, retr
on all rna.chin
next service call
6.
CleanPWA.
Class 3
Repair by r'eplc
modifiesdons.
Clas's 4
ModificatiQns
porated at discr
local manageme
customer's req\
Class .5
Production orUy
16.
Complete machine records.
7.
Check connectors.
8.
Check load pads.
9.
Install top cover.
10:
Operate system.
11.
Perform pr.inter maintenance.
12.
Complete machine records.
6DOP84592
1.6
1. GENERAL [
REFERENCE LIST OF TECHNICAL PUBLICATIONS FOR 820/a20-IT
-
1.6
REFERENCE LIST OF TECHNICAL PUBLICATIONS FOR 820/820-0
MANUAL NAME
VENDOR PART IJ
l-
820 Training Manual
(Xerox Corp)
600P84430
2.
630 Printer OEM Manual
(Diablo Systems)
90443-00
3.
630 Printer Service Manual
(Xerox Corp)
600P83475
4.
Motorola Monitor Service Manual VP41
(Motorola Corp.)
68P252~3A89-0
5.
Ball Monitor Service Manual
(8all Bros.)
5-017-1045
6.
Shugart Disk Controller 14030 OEM Manual
(Shugart)
0390Z2-1
7.
Shugart SAI000 Disk Service Manual
(Shugart)
039011-0
8.
Shugart SA850 Disk Service Manual
(Shugart)
039018-1
9.
Shugart SA800 Disk Service Manual
(Shugart)
039025-1
10.
Mostek zao MicroComputer Data Book
(MO$tek Corp)
MK7960Z
11.
Zilog zao Microcomputer Components
Data Book
00-2034-01
12.
Zilog Z80 Microcomputer Components
Data Book Document Change Notice
EO-2034-01
NOTE: Xerox Corp. only supplies Xerox Publications (600P). All other
publications will have to be ordered from the vendors listed above.
'600P84592
,,--·,),\4·
r"
IN-S'TALLATION
as
2.0 lN5TALLAllON
600PB4592
2. 2 Unpack Machine
2.1 Preinstall Checkout
2.4 Installation Check List
2.1 PRElNSTALL O£CKOUT
1.
Check the equipment for damage
NOTE: If the following condition(s) is not
corrected, tell your supervisor in writing of the
problem.
2.
Check the space requirements (Chapter 1,
Section 1.2).
WARNING
DO NOT try to correct wiring. If thefoUowing voltage(s)
is not within specification, tell customer not to connect
machine to outlet and have a licensed electrician correct
wiring.
Kr·.
4..
193
ACN
NEUTRAL
:02~~~V;~
(RX)
7('
ACH
UVE
~GND
3. With the top cover removed the two disk drives
should now be exposed. The fixed drive is the
outermost with the floppy drive between it and the
Power Supply. As you stand facing the left-hai1d
side of the unit (outer case of hard disk). note the
circular aperture in the hard disk's cage, exposing an
aluminum spindle hub (Figure 2- 1).
A fingered
flange is inserted into B hole in this spindle hub.
The fingered flange is a shipping restraint, called a
spindle lock, which MUST be removed before power
is applied to unit.
WARNING
After removal of the· spindle lock (step 5), be extremel
careful when attempting to move the system.. The fixe
disk drive is extremely delicate and can be ' everl
damaged if bumped or jolted.
ALWAYS replace th
spindle lock if you are going to move the system mar
than a few feet. After removal of spindle .lock, th
.spindle hub may be manually rotated, but QtI.LY in th
,CLOCKWISE direction. The read/write heads have
slight chamfer, and counterclockwise, motion couldC8UI
, them to gouge the media..
5~
Unscrew and remove the spindle lock. Invert it so
the protruding finger faces outwards towards you,
then screw it in this position (finger facing out) to
the disk drive case in order not to lose it.(Fig. 21)
6,
When you have inverted the spindle lock, walk
arwnd behind the un.it again. A white translucent
jack (Figure 2·1) mounted in a metal standoff'will
be visible from the rear of the Winchester disk
drive. This is a AC cable jack. A plug which
obviously mates to this jack should also be vi.ible
at the end of a cable running from the rear of the
floppy disk drive.
Press the plug into the
'Winchester dri.ve jack, making certain they are
securely mated.(Fig. 2-])
7.
Remove thedardboard shipping insert from within
the floppy disk drive.
It has been lnsened
between the heads to protect them:duI"ing
shipment. i
8..
Make certain that there is a Winchester. media
error map printout within the plastic pouch
attached to the disk drIve bubble.
This
information Is very important; it will be used as
backup hardcopy in event the flaw map
informatIon already on the disk is inadvertently
destroyed.
9.
Replace the top cover Do the. reverse of removing
the top cover, (Fig. 2-1). The long interlock screw
should be placed in the left hand hole of the top
cover when viewed from the rear.
(Figure 2-2)
3•. Check the ACPower at outlet (Figure 2-2).
2.2
• I
Check contents of installation kit.
UNPA~K MACHINE
1.
Remove all
materials.
external
packing
tape
and
Z.3 ~ET UP1
1.
Ensure power switch is off.
2.
Connect keyboard to display/processor.
3.
Connect disk drives to display/processor.
WARNING
DO NOT A TTE~T TO APPLY POWER TO FIXED
DRIVE BOX YET: severe damage to the hard
.0........disk drive will result.
FIXED DRIVE
1.
Set lJp
4. Ver.ify correct Jumper and Switch settings on Fixed
Controller PWA, on 10 MB Controller PW A, and on
Floppy Controller PW A. (See Repair Data Fixed
Disk Assembiy Adjustments 3.5.8.)
Lt:SS'THAN
10VAC
4.,
2.3
Remove (2) screws at rear of drive assembly;
NOTE:· The long screw in the left side of the box, facing
rear" makes the interlock switch when screwed in. When
replacing be. sure to put it in the left side, facing the rear
of the box.
10. Connect power cord(s) to AC outlet.
NOTE: There is an AC outlet at the rear of the 8'
BnCf'"Fixed Disk Drives that is live. when ,power or
switch on the drives is turned on. The printer 01
processor can be pluqged into it.
2. Slide top cover to reaf. then 11ft coveroff.(Fig. 2-1)
11.
Verify system operation by running system
diag.(chapter 6)
7-
z.o INSTALLAnor
600P84592
8" FlcIJPY Disk Drive
2.4 INSTALLTlON a-Ea< LIST
Remove Top Disk Cover.
PREINSTALL CHECKOUT
1.
2.
Ver:ifycorrect Jumper settings on the Floppy
Controller PW A. (See Repair Data 8" Disk
Drives 3.4.2.>
3.
Replace Top Disk Cover.
4.
Remove the cardboard shipping insert from
within the drive. It has been inserted between
the heads to protect them during shipment.
Shipping damage.
Space requirements.
AC power at outlet.
~.
5.
Installation Kit contents.
2.
UNPACK MACHINE
Connect power cord(s) to AC outlet.
Remove tape
6. Verify system operation by running system diag.(chapter 6)
the
("laTE: There is an AC outlet at
rear at tha a"
'driV"ei that is llve wh'en the power on switch on the:drive. is tumed On. The prlnter or processor can be
plugged into it.
3.
.
and materials.
SET UP
Power OFF.
Connect keyboard.
Connect disk drives.
Printer
1.
Connect Signal Cable to Processor.
Connect power cord(s).
2.
Select Baud Rate for 1200.
Install printer.
NOTE: If Installing 630 printer, use P-l/1730/630
Printer Service Manual,and set switches on HPR05
PWA as shown in fig. 2-3.
4.
OPERATIONAL/SYSTEM CHECI
Perform the Level 1 Checkc
Proce.dure
(Chapter 6).
WITHOUT
CONTROL PANEL
WITH
CONTROL PANEL
-...ON
I
ETX/ACK ENAIL!
DClIDc:J ENAILI
SEI! TAIU 2·2 {
Ill!
T~11.I 24.{
,
.:1
I
t ,
2
I
at
• -i' ,•
•
•
SELl' TEST
OC1/Od ENAILI
TEN I"tTCH
'A"'" (HAIU
EVfN 'IIlRITY
FULL DUI"L£X
iI 7
'20sneD
I' •
30
uno
Table 1·1
Table 1·3
omOI'CAL BAUD RATE SELEcr
LANGUAGE SELEcr
swtTCH
J
•
a,."
0"'"
• ., •
SWITCM
S
OFF
ON OFF OFII
OF" ON OF"
ON
ON OFF
OFII OFF ON
ON OFII ON
ON
OF" ON
ON
ON
ON
BAUD
,~
600
'800
2000
2<&00
4800
7200
9600
OFF
ON
01'11
ON
OFF
ON
OFF
.ON
Of'F
01'1'
ON
ON
OFF
OFI"
ON
ON
OFII
OFF
OFII
OFF
ON
ON
ON
ON
'''INT WHIIL SfLECT
OEFAUl.T TWP
rwp
LOGICAl. liT "AIRED
ArLo
FRENCH AZERTY
GERMAN
SCANDINAVIAN
NORSI(
(Figure 2-3) 1730/630 HPROS Contral·Switch
3.
F~ona
Connect power ,cord to AC outlet.
2
z.o INSTALLAnON
600P84~
\
~
...=•
iii
F'lgure2-1F'lxed Drive Assembly (8")
600PB4592
REPAIR DATA
3.0
3.1
REPAIR DATA
CRT Assembly
600P84592.
0
Note: The CRT must be tumed 90 clockwise while
placing it in front of assembly to relieve any strain on
high voltage lead.
B.
7.
Carefully place CRT on it's face in front of
assembly.
8.
Remove (4) screws from CRT PWA
remove PWA.
1.
Mark the bezel outline on CRT face wIth a
felt tip/grease pencil.
2.
Remove top cover (3.1.1).
3.
Tum power on.
and
REPLACEMENT
WARNING
Load diagnostic exerciser disc in Drive A 81
an initialized disc in Drive B, type A and pre
.-.
RETURN.
4.
DO NOT strike, nick, scratch or subject the CRT to any
undue pressure. The CRT may implode.
1.
Checkout Procedure: Load diagnostic exerciser' disc
In drive A and an inItialized disc In drive B, type
A and press RETURN. When X's fill the screen, prel
CTRL and type S. Using figure 3-4 check alignment
5.
When xes fill screen, press CTRL and type
Disconnect P102 and P103 from CRT PWA
(Ball Monitor only).
VERTICAL
LJ-EARITY
2.
Disconnect grounding springs from CRT
bracket and separate springs (Ball Monitor
only).
3.
Carefully place CRT in front of assembly
with the CRT anode towards the left.
4.
Install CRT PWA and place grounding spring
toward back of assembly.
5.
Connect green
(Motorola only).
ground
strap
on
o
screw
o BRIGHTNESS
o FOCUS
~f ---1
NOTE: The CRT must be tumed 90 0 counter
clockwise while installing CRT.
6.
7.
Carefully install CRT.
Connect grounding springs to CRT bracket
(Ball Monitor only).
8.
Connect P102, P103 and J1 to CRT 'PWA Ball
Monitor only).
9.
"-T'
$'
,
oJ
G)
0
HORIZONTAL
WIDTH
HORIZONTAL
UNEARITY
Connect power cord to wall outlet.
Ball
10. Perform adjustment procedure.
ADJUSTMENT
C.
@g "
0
PurQose: To obtain the correct size, centering
andhrightness of the viewing screen.
;l~
;~~
~@
VERTICAl.
HJLO
m~
BEZEL OUTUNE
HORIZONTAL
CENTERING
d
@
Ul
Uld
~o::
@sg is
&t-@
"-u
;i
~~
0
0~~
0
COMPONENT SlOE
Figure 3-4 DISPLAY ALIGNMENT
Motorola
'Figu~e" j~~'DIS'pt:Av ADJUSTMENT
3-2
s.
3.0 REPAIR DATA
3.1 Display/Processor
600PB4592
3.1
DlSPLAY/PROCESSOR
3.1.1
DISPLAY/PROCESSOR COVER(S)
A.
REMOVAL
3.1 CRT Assembly
GROUNDED SCREWDRIVER DISCHARGING CRT
WARNING
I-igh voltage exists on CRT. Remove all jewelry.
extreme care when working on or arOl.WKJ CRT.
Use
I
l
Figure 3-2 DISCHARGE CRT
3.
Discharge high voltage on CRT (anode 2)
shorting to frame. This is done by IJsing
meter lead, alligator clip, and scn'tW driv
as shown in fig. 3-2.
4.
Disconnect PI02, P103 and JI from C
PWA (Ball Monitor only).
5.
Disconnect grounding springs from (
brack~t and separate springs. (Ball Monito
only).
WARNING
DO NOT strike, nick, scratch or subject the CRT to
undue pressure. The CRT may implode.
Figure 3-1 REMOVE TOP COVER
1.
2.
J.
B.
Tum Power OFF.and remove power cord.
Remove (2) top cover screw~
Lift up top cover to remove.
REPLACEMENT
1.
2.
Place top cover on display/proc~ssor.
Install (2) top cover screws.
SUPPORT CRT
3.1.2
CRT
A.
REMOVAL
1.
Z.
AN)
PWA
REMOVE
HARDWARE
(4 PLACES)
Disconnect power cord from wall outlet.
Remove to,? cover (3.1.1).
Figure 3-3 REMOVE CRT
WARNING
Do not. strike, nick, scratch or subject the CRT to any
undue pressure. The CRT may Implode.
6.
While supporting the CRT, remove
hardware from bracket.
3.0 REPAIR DATA
600P:
3.1.4, Main/Processor PWA
".1.4
MAIN/PROCESSOR PWA
REF.
(Continu~d)
BETWEEN PINS
El
E2
'1 & Z
J9
7&8
11&12
15 & 16
19&20
ZJ &Z~
Z7 & 28
:51 &:5Z
:55 &::56
JlD
:5&4
7&8
I:"§:]
1
z
820-n PROCESSOR (CPU) PWA
SHUNT CONFIGURATION
REF.
BETWEEN PINS
,E1
1&2
E2
1&2
E4
1&2
E6
2&3
E7
1&2
J9
7&8
11&12
15&16
19&20
2:5&24
27&28
J10
:5&4
7&8
3-4 '
Figure 3-8 PROCESSOR SHUNT CONFIGURATION
J9
3.0 REPAIR DA'
600PB4592
6.
7.
3.1.3 Power Supply
Position
brightness
slide
control
for
maximum brightness.
Adjust brightness
control on the CRT PW A until the raster is
visible.
3.1.4
MAIN/PROCESSOR PWA
A.
REMOVAL
Alternately adjust the horizontal width and
horizontal linearity/centering until the X's on
both sides of the CRT are within 5/8" of the
bezel outline (figure 3-4).
.
8.
Alternately adjust the height/size and
vertical linearity untU the X's on top and
bottom of the CRT are within 1/2"(1.27 em)
of the bezel opening (figUre 3-4).
9.
Adjust vertical hold to center of adjustment
range.
3.1.4 Main/Processor F
1.
Remove top cover (3.1.1).
2.
Disconnect all connectors from bac
display/processor. (Fig. 3-18)
10. Position brightness slide control until raster
is not visible.
11.
Adjust the focus control until the edges and
center of the display image is in focus.
12.
Dress hIgh voltage lead down, towards
processor PWA, and the yellow cathode lead,
towards top of assembly.
13.
Clean face of CRT and install top cover
(3.1.1).
3.1.3
POWER SUPPLY
A.
REMOVAL
PROCESSOR PW A
1.
Remove top cover: (3.1.1).
2.
Disconnect PI from the power supply and P2
from the processor PWA.
REMOVE SCREW
(4 PLACES)
Fig'Jre 3-7 PROCESSOR PWA REMOV AL
POWER·SU'PLV
I
I
3.
Using a meter lead and alligator l;lips,
screw driver to CRT frame.
4.
Discharge high voltage on CRT (anode
shorting to frame.(fig. 3-2)
5.
Disconnect P5, P6, P7 and spade lug
the processor PWA
6.
If
820/820-n then remov., (2)
attaching support block for Deught
Remov~ Oa'Jghter PW A from processc
I
I
I
I.
I
•I
• .;_.
,0•
Remove (4) screws from the proce~
and remove by sliding out of the
processor.
REPLACEMENT
7.
~
B.
NOTE: Before installing the processor PW At ens
the shunt configuration is correct (Figure 3-8).
Figure 3-6 REMOVE POWER SUPPLY
3.
Remove (4) power supply screws from the
supply.
c:RT:fr~meandremovepower
B.
RiPLACEMENT
'.'
-
1.
Install processor PWB and (4) screWI.
2.
If
820/820-n replace Daughter P'
support block.
NOTE: Daughter PWA is not keyed. Mati
on daughter PWA with pin 1 on connector.
3.
Connect PS, P6, P7 and spade lug
processor PWA.
4.
Connect all connectors to the back c
5.
Install top cover (3.1.1).
..
I., :'Insta11pc:»~!rsupply.and replace (4) screws.
2.
ConnectPf'andP2.
3,.. ~sta11·t~~,~~t~'r.~).1.J).
3.0 REPAIR DATA
3.2.2 Keyboard PW A
3.2.3 Keyboard Harness Assembly
600P8459
3.2.2 KEYBOARD PWA
CLAMP
A. REMOVAL
1.
Remove keyboard cover (3.2.1).
GROMMET
LOOSEN
(4· PLACES)
Figure 3-12 REMOVE HARNESS
4.
Release locking tabs from harness Bsser
bracket and remove assembly.
5.
Remove harness clamp and grommet.
Be REPLACEMENT
1.
Install harness clamp and grommet.
CAUTION
Grommet must be inserted in bracket cutou
damage to the harness will occur.
2.
Install harness on bracket insuring
is in bracket cutout.
Figure 3-11 REMOVE KEYBORD PWA
3.
Install harness assembly in bottom cover.
2.
Remove (4) screws securing keyboard and
brackets in place.
4.
Install keyboard cover (3~2.1).
3.
Remove keyboard, shield, and brackets.
5.
Connect keyboard
processor.
Be REPLACEMENT
1.
Install shield.
2.
Put keyboard in top cover ensuring alignment
tabs are. positioned . in keyboard bracket
cutouts.
3.
Position locking ,tabs over brackets and
tighten. screws.
Install keyboard cover.
4.
3.2.3 KEYBOARD HARNESS ASSEMBLY
A. REMOVAL
3-6
grOrT
1.
Turn power off.
2.
Disconnect keyboard harness from display I
processor.
3.
Remove keyboard cover (3.2.1).
harness
to
disl
600P84592
3.0 REPAIR OAl
3.1.5 Power ON/OFF Switch"
3.LS
POWER ON/CFF SWITCH
A.
REMOVAL
B.
3.1.6 Brightness Control
3.2 Keyboard
RELEASE TAB
(2 PLACES)
1.
Disconnect power cord from wall outlet.
2.
Remove top cover (3.1.1).
3.
Remove main/processor PWA(3.1.4).
4.
Disconnect wires from terminals 1 and 2 of
the power on/off switch.
PRESS
5. Remove switch.
REPLACEMENT
1.
Install switch and connect wires to terminals
1 and 2.
2.
Install main/processor PWA (3.1.4).
3.
Install top cover (3.1.1).
4.
Connect power cord to wall outlet.
Figure 3-9 REMOVE COVER
3.1.6
BRIGHll£SS CONTRa..
A.
REMOVAL
B.
2.
1.
Remove top cover (3.1.1).
2.
Remove main/processor PWA (3.1.4).
3.
Remove knob from brightness. control. lever
by pulling down on knob.
4.
Disconnect PI from brightness control.
5.
Remove (2) screws from· brightness control
and remove.
Press on cover above iocking tabs and
tabs.
CAUTION
The keyboard hamess and grtUlding wire ma
connected befm:e removing top cover and Iceybc
REPLACEMENT
1.
Install brightness control and (2) screws.
2.
Connect PI to brightness control.
3.
Install brightness control knob.
4.
Install main/processor PWA(3.1.4).
5.
Perform brightness adjustment (3.1.2C).
6.
Install top cover (3.1.1)•.
GROUND
3.2 KEYBOARD
HARNESS
Figure 3-10 DISCONNECT CABLE(S)
3.2.1 KEYBOARD COVER(S)
3.
Lift back of top cover, disconnect ke:
harness and grounding wire.
4.
Remove top cover and keyboard.
A. RElv10VAL
1.
Tum power off.
CAUTION
When releasing locking tabs, if presata'8 is not applied
directly above tabs, they may break.
B. REPLACEMENT
1.
Connect keyboard harness and ground
wire.
2.
Insert front tabs of k.,yboard.
3.
Press on cover above locking tabs am
tabs.
3.0 REPAIR DA 1
600P84592
3.3.1 Disk Drive Cover
3.3.2 Disk Drh
3.3 DISK DRIVE ASSEMBLY (5.25")
3.3.1 DISK COVER(S)
A. REMOVAL
1.
Tum power off.
2.
Disconnect
disk
disp~ay/processor.
drive
harness
from
NOTE: In the following step, protect top cover
from damage.
3.
Tum disk drive over to allow removal of the
cover mounting screws.
REMOVE SCREWS
(2 PLACES)
Figure 3-14
3.
DISK DRIVE REMOVAL
Remove (2) disk drive screws and remo\'
drive.
.
B. REPLACEMENT
NOTE: The left disk drive must be conf
before installing.
.f
REMOVE SCREWS
(4 PLACES)
Figure 3-13
4.
TOP COVER REMOVAL
Remove (4) top cover screws and remove
cover.
1.
Position disk drive under bottom cover•
2.
Install (2) disk drive screws.
3.
Connect Pl and P2.
4.
Install top cover (3.3.1).
C. ADJUSTMENT
Purpose: To strap the left drive for p
drive A and the right drive for physical drivt
B. REPLACEMENT
1.
Install drive assembly in top cover.
2.
InstaH(4ltop cover screws.
3.
Connect drive assembly to display/processor.
3.3.2 DISK DRIVE
A. REMOVAL
1.
Remove top cover (3.3.1).
2.
Disconnect P1 and P2 from disk drive PWA
i
Checkout Procedure: Load the system/dia,
disc from drive Aand check operation.
3.0· REPAIR DATA
J.J.2 DISK DRIVES (5)
J..J.J I-EAD LOAD PAD
RESISTOR NETWORK
DRIVE A
LEFT
/
10
:8
14
7
1
DOUBLE
SIDE
16CJ9
1· •
A.. REMOVAL
DRIVE B
RIGHT
SINGLE
SIDE
CUT/BEND
14
600P8459~
3.3.4 Disk Drive Belt
3.3.3 Head Load Pad
c:J
W
1.
Remove top cover (3.J.l).
NJTE: To remove load button on left disk driremove drive before proceeding.(3.3.2)
8
7
CUT/BEND
8
Figure J-16
DRIVE B
(RIGHT)
DRIVE A
(LEFT)
HEAD LOAD PAD REMOVAL
2.
Disconnect PI, P2, P4 and remove (2)
from disk drive PWA
3.
Remove PWA from bracket and move to ri
of drive.
4.
Hold load arm away from head, sque
locking tabs together with needle nose pi:
and press forward.
Sl
. B.. REPLACEMENT
1.
Press head load pad into load arm from h
side. Inspeck and clean head if nec~Bry.
2.
InstalldrivePWA.
3.
Install top cover (3.3.1).
3..3..4 DISK DRIVE BELT
CUT
DOUBLE
~SIDE
lim
CUT
A. REMOVAL
1.
NOTE: To remove drive belt from right
drive, remove drive before proceeding.(3.,~.2)
2.
SHUNT
Figure 3-15 DISK DRIVE
3-8
1.
Configure program shunt by cutting shunts as
shown in. drawing.
2.
Configure
drawing.
resistor
network
Remove top cover (3.3.1).
Remove drive belt.
B. REPLACEMENT
1.
Install drive belt with smooth aids of I
against pulley.
2.
Perform adjustment.
3.
Install top cover (3.3.1).
as shown in
. Y.U Kt:JJAIK
DATA
600P84592
3.4.2 DISK DRIVE(S)
3.4.2 DISK DRIVE{S)
A. REMOVAL
1.
Remove top cover (3.4.1).
2.
Disconnect AC, DC, and signal harness 'plugs
from disk drive.
3.
Loosen (2) screws holding front bezel in place
and remove bezel.(Fig. :5-20)
4.
Remove (2) disk drive screws and remove disk
drive.(Fig. 3-20)
LOOSEN SCREWS
Fig. 3-20 DISK DRIVE REMOVAL
a.
REPLACEf\,£NT
NOTE: The right disk drive must be configured
before installlng.(3.4.2)
1.
Position disk drive on bottom cover.
2.
Install (2) disk drive screws.
T
x
3.
Install front bezel.
4.
Connect AC, DC, and signal harness plugs to
disk drive.
.
NOTE: When replacing· left Disk Drive the clamp
holding the AC/DC harness should .be replaced
also.
s.
00
¥
•
A
8
-n
1:)O""TI
100
Install top cover (3.4~l).
~
801
C.
ADJUSTMENT
1. Replacement disk drive must be jumpered
before installation (Fig•.3-21)
NOTE: The disk drive spare may have factoryinstalled jumpers which are different from those
shown in Fig.3-21. Some models of this. disk drive
wiUnot have jumper pins at location L. A wire has
been soldered to accomplish the same function.
·2.Referto Fig. 3-21 and configure jumpers
exactly as shown.
. . .
a. Remove. any jumpers not shown!n Fig. 321 •.
,b. Add any jumpers 'necessar'y;'askfi6wn'ln "',.,
Fig. 3-21.
3-10
...
o
Figure 3-21
SINGLE SIDE
Disc Drive Jumper Locations
cont.
).u
Kt.J'AlI
3.3.5 Disk Drive
600P84592
3.3.5 DISK DRIVE HARNESS
c. ADJUSTMENT (Motor sPeed)
Purpose: To adjust the disk drive motor for
correct operating speed.
O1eckout Procedure:
NOTE: When performing the checkout procedure,
do not disconnect disk drive harness from
display Iprocessor.
o
Remove top cover (3.3.1) and observe the
dark lines of the rings on the spindle pulley.
The dark lines should appear motionless.The
outside ring is 60 HZ and the inside ring Is 50
HZ.
NOTE: This adjustment can be made only in an
area where there is flourescent lighting.
ADJUST
A. REMOVAL
1. . Remove top cover (3.3.1).
2.
Disconnect PI, PIA, P2 and P2
drives.
3.
Disconnect black lead (.12VDC
bottom cover.
4.
Disconnect and remove ham,
clamp and save.
~ REPLACEMENT
1. . Install restraint clamp over harn
2.
Attach restraint clamp to bottOf1
3.
Attach black lead (.12VDC fllte
cover.
4.
Connect PI, PIA, P2 and P2A to
5.
Install top cover (3.3.1).
6.
Connect
disk
display/processor,
drive
h
3.4 DISK DRIVE ASSEMBLV (8")
3.4.1 DISK COVER(S)
A. REMOVAL
DISK DRIVE SPEED ADJUSTME~T
1.
Turn power off.
Install disk In drive to be· adjusted, type AlB
press return.
2.
Disconnect PI, PIA, P2 and p'
drives.(Fig.3.;.18)
Figure 3-17
1.
usa
2.
Adjust motor speed pot until the dark lines of
the outside ring on the spindle pulley appear
motionless.
RXO
3.
Adjust motor speed pot until the dark lines of
the inside ring on the spindle pulley appear
motionless.
4. Install top cover (3.3.1).
+12VDC FILTER
REMOVE SCREWS
~--2~
Fig.3-19 TOP COVER REMOVAL
3.
Remove (2) screws at the
asembly (Fig. 3-.19), slide COy
rear, then lift top cover off.
B. REPLACEMENT
CLAMP
Figure 3..18 DISK DRIVE HARNESS REMQVAL.
,
"
·.0 -
- -
-.-
~-:l,'::.-
1'1
.-j
: 1.
Install top cover on Drive ass
2.
Slide cover towards the fron1
'3.
Install (2) rear cover
4.
Connect drive a$sembJy to dl
screWS.
3.0 REPAIR DATA
600P84592
]
~.
Left Disc Drive
Left Disc Drive
Right Disc Drive
Figure 3-21
~
DOUBLE SIDE! MLC 14 PWJ!.
..
Disc Drive Jumper Locations
:-
,.4.3
Right Disc Drive
HEAD LOAD PAD, SINGLE SIDE
DISK DRIVE
REMOVAL
f'igure3-21 > .
.DOUBLE' SIDE!: MLC 12 PWA
Dlse DrIve Jumper LocationS' -
-
1. . If removing left disc drive load pad, remove t
cover {3.4.1) and left disc drive (3.4.2)•
removing the right disc drive load pad, remo
top cover only.
.
2. Rotate head stepper motor shaft at rear of
until head assembly is moved forward.
:.
I
3. Lift and hold head load .arm out away
head..(Fig. 3-22)
4. Squeeze locking tabs together with needle
pliers and press forward to pop out load pad.
3.0 REPAIR DAT,l
600P84592
-
"" I'
o
Itt
••
• 00
"
io~
OS1._·
"
_0
.. -
0.-0
0.11
S
32
00. T2
00
III
.,. ....
_ _ 00
OSI A
".
III
T1
.a
HL 0
a •
Left Disc Drive
Y
I
••
' • •0 ...
00000000 0
000
,,"n"at"""
,.,
Left Disc Drive.
L
-.
... I'
I tt
••
.OO
g
~
S·
[
_c
.. "m*
........
"
• • _0
0.11
" ..
_.00
00
OS1 0 0 _
OS2_ T2
3 00
4 00
3 00
0
801
J
T4 00
fggg
_ _ 00
A
B
OSI
HL 0
x
00
T1
··Right Disc Drive
Figure 3-21
SINGLE SIDE
wI LSI CHIP
Disc Drive Jumper Locations
••
Y. I
".
.. oo
• oo
a •
......
.
00000000 0
000
"""""",,,. ,.,
Right Disc Drive
Figure 3-21
SINGLE SIDEw/NE.W LSI CHIP COI"-FlGl
Disc Drive Jumper Locations
.).u Kl::..PAIR DATA
3.5..2
3.5.3
FlXED DRIVE CONTROLLER PWA
10 MBCONTROL PWA
3.5.4
,.5.2
6UUP8459Z
FIXED DRIVE CONTRCJ..LER PWA
3.
FIXED DRIVE
Secure locking Key into spindle (Fig.3-26)
I CAUTION
00 NOT ATTEMPT TO MOVE DRIVE WITHOUT
.SPINDLE LOCKED DOWN.
A.REMOVAL
1.
Remove top cover. (3.5.1)
2.
Remove (2) screws supporting Controller.
PWAsupport bracket to drives. (fig. 3-25)
DO 00
DC and Signal hamess
~
19
Q
.•
LOCKJNQ
\.~: COYIII
f\.IOTE: Whenever the machine or the fixed
drive is moved,the lock key must be put
b·9ck in place to keep from damaging the
drive. When removing the lock key, turn
.it bottom side up and fasten it to the
drive so it can be stored for future use.
Fig. 3-26 FIXED DRIVE SPINDLE LOCK
Fig.
3-~5
4.
Disconnect AC, DC, and signal hamess.
5.
Disconnect ground strap from AC connector.
6.
Loosen (2) screws securing bezel.(fig. 3-20)
and remove bezel.
FIXED. DRIVE ASSEMBLY
7.
3.
Unplug DC and signal harness plugs from
Controller PWA.
4.
Lift ControllerPWA and support out of drive
assembly.
5.
Remove. (5) screws attaching PWA to support.
Remove (2) screws securing Fixed Drive to
~ase !J~dremove drive.(f="i~.3:-~..!!L_
8. REPLACEMENT
1.
Replace drive onto base and install (2)
screws.(Fig.3-20)
2.
Install front bezel.(fig.3-2.0)
3.
Connect' ground strap, AC, DC, and signal'
harness.
8. REPLACEMENT
1.
Refer to procedure 3.5.8 for switch setting.
2:
Fasten Controller PWA to support bracket
with (5) screws.
.
5.
Lower PWA and bracket into the slot
between floppy drive and fixed drive.(fig.325)'
'.
','
Remove locking screw, invert spindle locking
key, and attach it to the drive casing.(flg.326)
6.
Replace top cover.(3.5.1)
3.
4.
Attach
DC
PWA~(fig.3-25)
and
signal
NOTE: Care
should be
;'refns talllngsignal. harness.
S.
6:
':5.3
,R~plac~ top cover.(J.S.1)
":'-'-~''''.;'':_'. -':'
..
A~REMOVAL'
:2.
taken
Secure bracket with (2) screws to drives.
FIXED DRiVE
1.
harnesses
to '.5.4
when
10 MB CONTROL PWA
A.
REMOVAL
1.
Remove top cover (3.5.1.).
2.
Remove fixed controller PW A (3.5.2.).
3.
Remove fixed drive (3.5.3).
4.
Disconnect J6 through J9 on 10 MB
controlPWA. (See Figure 3-27).
5.
Remove one screw located at top edge
of ~,,!A. (Fig.3-27)
6.
Ulfasten
mounts•
7.
Remove 10MB control PWA.
Removetopcover.(3.5.1)
Remove Controller PWA.(3.5.2)
. ;·...r'-~i_t ",,,,': >~<-h:'~-'l~'\(¥;~'l
i:~~''f:'><'
--- - -- . '. - .
thee,) quarter
tum
PWA
600P84592
J.S FIXED DRIVE ASSEMBLY
3.4.4 8" DISC DRIVE POWER SUPPLV
REPLACEMENT
CAUTION
Do not touch the soft pad surface on the load pad. TIle oU
or dirt from fingers can harm the disc lurface..
1.
Connect P-l and P-2 to power supply.
2.
St'!("ure power supply with (4) nuts to br..
1. Press load pad into arm from head side until it
3.
snaps Into place.
2. Lightly wipe the read/write head with Clean-ups
and allow load pad arm to return to operating position.
Check J-S pins on cbk drive board to
. voltages (F"ig. J- 24).
4.
Replace top cover· (J.~l).
5.
Run dlagnostica to check system.
3. Replace disk drive, if removed, and verify repair.
4. Replace top cover(J.4.l).
J-5VCJ
5. Run diagnostics to verify replacement.
PIN I
1
2
3
'4
-
5
6
100
00
101
i \
1/
'-d.'
II _~~. ';,,\:.
.:o
C
~oadPad~">
'.':')
.FlG.:3-24 J-S PLUG ON DRIVE BOARD
~.~
'.5
F1G... )';'Z2··I-EAO LOAD PAD REPLACEMENT
.
FIXED DRIVE ASSEMBLY
Note: F"or removal and replacement of 8 ft floppy
fixed assembly reference floppy drive assembly 8t
, F"or jumperconfigurat1on reference 3.5.8, step J.
\
3.4.4 8" DISC DRIVE POWER SLPPLV
NOTE: F"or .removal and replacement of power
the fixed drive assembly, reference 8 t1 eliek dri
supply 3.4.4.
.
REMOVAL
1.
Tum drive power. off.
2.
,Remove. top~oves:. (:'5.4.1)
3.
Remove (4) . nuts
bracket.(Flg.'.Z3)
4.
'.5.1
securing
power
supply
to
DISK COVER(~)
A.REMOVAL
Disconnect P.1 and P-2 from power supply and
lift out.
1.
Tum power off.
2.
Disconnect
disk
displayIprOcessor.
3.
R.emove. ,(2) screws at the rear of
assembly· (fig.3,;,19), slide cover towarcb
then 11 ft cover off.
drive
harness
NOTE: The,<.lcmg screw in the left side (as v
from the. rea~",ofthe unit) of assembly Is to
the interlock' switch. When replacing be Sl
install long screw in left side.
a.
"/~ ,t~,i'f"::~~;~'~'t,
'.'. _ _ _.
-, __ '.
,. ~
F1G.. '-23 POWER,·SUPPLV REPLACEMENT'
REPLACEtvENT
1.
Install top cover on drive assembly.
2.
Slide cover towards front.
,.
Install (2) rear cover screws. F"acing th
of the assembly the long screw goes
left side•.
4. 'C~nec,t
signal
di8p~ay/processor.
harness
to
J-l
3.0 REPAIR DATA
3.5.7 DAMPER ASSEMBLV
9.
Loosen and slide capacitor mounting
bracket out of way.
10.
Note wire color codes connecting to
capacitor, then remove wires from
capacitor.
11.
Remove remaining motor mounting nuts
and washers, and remove motor and
cable hamess.
600P84592
"""L'" ----1=---
AC 0 ..1."
"'0"
.
.
Be
REPLACEMENT
NOTE: If replacing only the belt, perform steps 9 thru 15.
1.
2.
Remove .motor pull ~y nff of old motor
and' install onto new motor.
Motor pUlley should be .035 inch (.88
MM) up off of motor face. (See Figure
3-29).
Ensure that one· set screw Is
located on flat side of motor shaft.
Mount motor to casting placing an
insulating washer on each side of casting
on all four posts except the post which
the belt cover mounts, no washer is
needed on the nut side of that post.
4.
Verify center to center distance of 7.74
inches (19.6 cm) from motor shaft to
spindle shaft.
5.
Reposition motor if necessary to meet
center to center spacing and tighten
nuts.
6.
Replace color coded wires on the noted
leads ,of· capacitor.
7.
Route wires for rear AC connector and
mount in rear bracket.
8.
9.
Rqtate·. capacitor.securlng bracket over
capacitor and tighten screw.
Replace 10 MB Drive Belt by sliding over
pulleys wi th number of belt on outer
side.
,CAUTION
Rotating. the spindle. in a counterclockwise
direction will cause severe damage to the
heads or media.
10.
Figure 3-29
10 MB'ORIVE MOTOR
Pulley Replacement
3.5.7
DAMPER ASSEMBLV
A.
REMOVAL
1.
Remove top cover (3.5.1.).
2.
Remove fixed controller PW A (3.5.2.).
3.
Remove fixed disc drive (3.5.3.).
4.
Remove 10 MB disc cover by removing
(3) securing screws.
CAUTION
AC power must be applied to drive when
removing damper.
CAUTION
(
I
Do not tum on system power until spindle
locking bracket is removed.
5.
Position drive on its side with damper
facing up.
6.
Remove spindle locking b~acket, connect
J4 and apply power to fixea disc drive.
7.
Remove filler screw from
damper. (See Figure 3-30).
Replace 10 MB belt cover and .~curing
nut. (Use motor mounting post and nut
inside of belt path.)
11.
Replace drive spindle lock.
12.
Replace 10 MB disc
securing ,screws.
13.
~eplace
14.
Replace fixed controller PW A (3.5.2.).
15.
Replace top cover (3.5.1.).
side
~FILLER
..
•
I
-...
SCREW
ALLEN
WRENCH
cover and (3)
fixed disc drive (3.5.3.).
Figure 3-30
DAMPER ASSEMBLY
Removal Procedure
of
600P84592
3.5.5 10 MB STEPPER PWA
3.5.6 10 MB DISC MOTOR/BE
RED TRACER
e
rUg
-{[f-.=-I
.-;'1
• ..;,j
--
J11
n·-.21
Figure 3-28
'3- .,: J5
h~.~.~
Figure 3-27
10 MB STEPPER PWA
...
10 MB CONTROLPWA
Be
REPLACEMENT
1. Refer to procedure
settin!)",.
'.5.8,
B.
step Z, for jumper
Replace stepper PWA.
2.
Replace ground strap and (3) sere..
stepper PWA to castlng.(Fig. '·28)
Replace 10 MB control PW A.
3.
Fasten the (,) quarter turn PWA mounts.
,.
4.
Replace one screw located at top edge
of PWA.
4.
s.
Replace "disc cover and the 0)
screws.
Refer to Figure '-27 and reconnect J-S
..th.rough J-9.
S.
Replace fixed drive
6.
Replace fixed controller PW A ('.5
6.
Replace Fixed Disc Drive ('.5.3.).
7.
Replace top cover (3.5.1.).
7.·
Replace fixed drive Controller PWA
('.5.2.).
Replace top cover n.S.l.)
Connect flat ribbon connector to s
PWA.
Sf!
C~.S.3.)•
10 MB DISC MOTOR/BELT
3.5.6
A.
REMOVAL
1.
Remove top cover (3.5.1.).
Z.
Remove fixed controller PW A (3.
10 MB STEPPER PWA
:5.
Remove fixed drIve (3.5.:5.)
REMOVAL
4.
Remove 10 MB disc cover by 1
(3) screws securing disc cover to
S.
Remove spindle locking key
i'KlTE: On future fixed driw systems the stepper control
PWAwillbe incoporated intoal0 MBcontrol PWA.
A.
1.
2.
8.
3.5.5
REPLACEMENT
1.
Remove top cover (3.5.1).
2.
Remove fixed controllerPW A(3~S.2.).
3.
Remove fixed drive (3.5.:5.).
4.
Remove 10 MB disc drive cover by
removing (:5) screws securir:'g cover to
casting.
S.
Disconnect flat ribbon connector from
stepper PWA. (figure '-28).
6.
Remove (3) screws securing stepper·PWA
to casting.
7.
Remove stepper PW A.
28).
(See Figure. 3-
CAUTION
Rotating the spindle. in a counterclockwise (
cause severe damage to heads or media.
6.
Remove 10 MB disc belt
removing the (1) nut secUring
casting.'
7.
. Remove 10 Me disc belt by sl
belt off the motor pulley.
8.
Remove AC, connector fr
bracket.
NOTE: Perform steps 8 thru 11' only If r
disk drive.
t
3.0 REPAIR DATA·
600P84592
,.
'·'6.
J8
J1
8" floppy disc controller PWA must be
jumpered before installation to match
Figure
Spares
may
be
jumpered
differently or may have soldered or
wire wrap wire instead of jumpers,
which wlll require correcting to
the appropriate setting or jumper.
NOTE:
DRIVE
OPTIO."
DJPSWITCH
(2Hl
.1
1101
COMPONENT SlDI!
o
.1
"'"
o
Q
srATUSg
LED"S
Q
o
o
J5
Jt.
Figure 3-34
FIXED DISC CONTROLLERPWA
Switch Settings
Figure 3-36
DOUBLE smE!MLC 12 PWA
Replacement 10 MB disc· controller PWA
must be Jump.ered. before installation. to
match F1gure ,.".
.
.
TPgo
o
o·TPI3
TPS
Disc Drive Jumper
Locatio~
oTP4
oTPl4
°TP3 •
o
. TPl2
r----;I
TERMINATOR
L--.:J +- CHIP . INSTALLED
oTPl1
TP2
oTPI
°
TP7
° TP8
°
oTPIa
°TPIO
oTP6'
.flgure3-3'
10 M8 DISC CONTROLLER PWA
-..Jul]l~r.,~ttings
Figure 3-36 ..
DOUBLE SIDE!MLC14 PWA
Disc Drive Jumper Locations
600PB4592
3.5.8
8.
Insert a .05 inch (1.27 MM) allen wrench
into hole and loosen screw. (See Figure
3-31~
.
9.
3.0 REPAIR OAT,
FIXED DISC ASSEMBLY ADJUSTMENT~
5.
Place damper on actuator motor shaft
.01 inc", (.25 MM) off the track 00 flag
collar.
Rotate damper 90 and loosen second set
screw.
6.
Tighten set screw rotate 90 0 and tighten
second set screw. (See Figure 3-33).
10.
Gently remove
pressure.
7.
Replace filler screw.
8.
Wipe damper clean.
11.
Replace filler screw.
9.
Turn off system power.
12.
Turn power off.
0
damper with
upward
10.
Replace 10 MB disc cover.
11.
Replace fixed disc (3.5.3.).
12.
Replace fixed controller PWA (3.5.2.).
13.
Replace top cover (3.5.1.).
FEELER GUAGE
0.01 INCH
(0,25 MM)
Figure 3-31
DAMPER ASSEMBLY
Screw Locations'
a.;
Figure 3-33
REPLACEMENT
I;;'
DAMPER ASSEMBLY
Replacement Procedure
Ensure' power 'ls on and J4 is connected.
CAUTION
Do not move damper assembly without AC
power applied to fixed disc.
2.
Locate and align one set screw with
filler hole on replacement damper.
3.
Using pHer,remove'damper plug.
Figure 3-32).
4.
Remove
filler
screw
damper~
from
side
FIXED DISC ASSEMBLV ADJUSTMENTS
3.5.8
NOTE:
For removal and replacement of E
floppy drive in fixed drive housir
reference floppy drive assembly ~
3.4.2.
NOTE:
For removal and replacement l
power supply in fixed. drive housil
reference 8" disc drive pawl
supply 3.4.4.
(See
of
1.
Fixed drive controller PWA switches
set beforeinstallatlon.
DIP SWITCH SETTINGS
FIgure 3-.32 .
DAMPER ASSEMBLY
, withPlug'········
,A.
Switches 2, 3, 5 ON
Swit.C::hes 1, 4, 6, 7, 8 OFF
Refer to (Figure 3-34).
600P84592
3.0 REPAIR D.
3.5.9
3.5.9
INTERLOCK SWITCH
A. REMOVAL
NOTE: Interlock switch has AC power going to it.
Disconnect AC cord before removal and
replacement.
1.
Remove- top cover (3.5.1)
2.
Remove securing" screw forfnterlock--swffch
mounting bracket.
3.
Lift interlock bracket out, and dlsconnect
interlock harness from interlock switch at
connection J5/P5.
4.
Remove interlock
bracket.
switch
from
interlock
B. REPLACEMENT
1.
Insert interlock switch into interlock bracket.
2.
Connect interlock harness to interlock
switch. Insure locking insert on the switch
mates to locking tab on harness.
3•. Replace bracket and install securing screw.
Ensure fixed drive ground strap is connected
to screw.
C. AD.:l.JSTMENT
1.
Placement of mounting bracket must be 1 inch
away from. top cover screw mounting tab.
Tighten securing' screw. (Refer to figure 327).
2.
Replace AC cord.
3.
Replace top cover.
NOTE: If no power is observed when system power
switch is turned on, check interlock switch
mounting bracket alignment.
LOa<ING INSERT
AND TAB
FlG.3-Z7 INTERLOCK SWITCH
INTERLOCK
swr
600PB4592
-PARTS
IDENTI,FICATION
4.0
PL 4.1
PARTS IDENTIFICATION
Display Processor
600PB4592
XEROX
PART NO.
ITEM
8
9
11
12
13
15
16
17
2582073
105P80366
110P80540
117580673
117§80724
123P80103
140582702
140582628
140582828
152524160
152581238
6015870
140582771
140582758
3P80664
116P80768
116P80769
A
99P3049
1
2
3
4
~
5
6
7
*The monitor PWA is
O.JSO'
DESCRIPTION
Top Cover "Assembly (l5C only)
Power 5UP~IY
Power On Off Switch
Power Cord Assembly (927)
Power C~rd Assembly (U05N03)
* Monitor (CRT & PWA)
Brightness Control PWA
Processor (CPU) PW A (927)
p'rocessor (CPU) PWA (U03!U05)
Prin"ter Cable (10, feet)
Signal Harness
2.0 Rom Kit
Floppy Drive Interface
Fixed Drive Interface
Knob
Contact Strip-Bottom
Contract Strip-Top
Fuse 2.5A (Package of 5)
p~r~
C?f Item 5.
" (RXO)
!m:1
1
XEROX
PART NO.
2582073
2582110
105580383
110P80470
117580697
117580729
123P80105
123P80114
104582626
104582755
140582774
140582777
152524160
152'581238
N/A
2
3
4
5
6
7
. 8
9
10
11
12
13
14
--
15
16
17
140582771
140582758
2582072
2582114
3P80664
116P80768
116P80769
A
708W09501
.
DESCRIPTION
Top Cover Assembly
Top Cover Assy .• FCC Class B
Power Supply
Power OnlOff5witch
Power Cord (E 39)
Power'"Cord '(U04!U06!U44!U45)
* Monitor (CRT & PWA)
* Monitor (Green CRT)(U44/U45)
Brightness Control PWA
Processor PWA Tag 112 (E39) (except Germany)
Processor PWA FCC Class B (E39:(Germany on
Processor PWA J~04!.~_~6/~44/U45) "
Printer Cable
~ignal Harness
Data Label
2.0 ROM Kit (US)
Floppy Drive Interface PW A (U04/U06/U44/U4~
Fixed Drive Interface PWA (UG4/U06/U44/U45
Bottom Cover
Bottom Cover FCC Class' B
Knob
Contact Strip-Bottom (U04/U06/U44/U45)
Contract Strip-Top (U04/U06/U44/U45)
FuseL.25A
.
~rheMonitorPWBis part of Item 5.
4,.0
PL 4.2
PARTS IDENTIFICATION
600P84592
Keyboard .Assembly
(USO)
XEROX
··ITEM
PART NO.
1
2
2P29832
4P80154
91PS1375
110580542
110580564
152581237
19P80573
3
4
.,
5
.
,
DESCRIPTION
Keyboard Top Cover
Foot
Logo
Keyboard Assembly
Keyboard Assembly (Alt.)see note
Keyboard Harness
Keyboard Mounting Bracket
NOTE: This keyboard will reduce entry errors associ ated wi th
typing speed, comr:nonly known as keybounce.
(RXO)
XEROX
"ITEM
1
2
3
4
5
6
7
PART NO.
2P29832
4P80154
91P8137.5
110580.5.52
1.52581237
91P81.574
73522090
.73522091
73522092 "
73522.093
~i~~~g~·~,·
·735'22096
73522097
73522098
! 3.~.?2S·30
8
9
4-3
. 73522831
2P82033
19PB0573
DESCRIPTION
Keyboard Top Co.ver
Foot
Logo
. Keyboard Assy
Keyboard Harness
Product Code Label
UK English Keycap Kit
French Keycap Kit
German Keycap Kit
Dutch Keycap Kit
Italian Keycap Kit
Swedish/Finnish Keycap Kit
Norwegian/Danish Keycap Kit
Spanish Keycap Kit
ASC U· Keycap Kit
Swiss French Keycap Kit
Swiss German Keycap Kit
Keyboard Bottom Co~er
Keyboardtv1ounting Bracket
4.U
600P84592
.
PAKI
PL 4.1
.
~
1U t:..NllfLC,£
.
Dlsplay
Pro
~.
I
5
-----7m
II (
./
I10
(RXO)
14 (RXO)
IS
TS IDENTIFICATION
4.0
PAR
PL 4.2
600P84592
Keyboar
d Assembly
,1
,
[I
8 (RXO)
6 .~,.
.
:;~"+"
,<.<,.B".:'. i. 9>-.,.,
.
'4-4
4.0
PARTS IDENTIFICATION
PL 4.3 Disk Drive Assembly (5.25" Sing1E~/Dual Sided)
600P84592
(USO)
ITEM
-,-
XEROX
PART NO.
1
2582071
TBA
2
3
4
76520215
6015868
82P80650
82P80675
152581236
6015869
73580445
73580504
5
6
7
DESCRIPTION
Top Cov~r (TSC only)
Injection Molded
Top Cover (TSC only)
See Note 1
Drive Belt
Head Load Pad
Disk Drive (Single Sided)
Disk Drive (Dual Sided)
Harness Assembly
Shunt Kit
Di agnostic Disk
Dual Sided Diagnostic Disk
NOTE 1 - The plastic injection molded· cover has a lead
base paint on the inside of the cover.
(RXO)
ITEM
-.
XEROX
PART NO.
1
2582071
TBA
2
76S202l5
76520216
82P80650
82P80675
152581265
133P80440
130521204
9.JJ'_~1573
91P81608
3
4
5
6
7
8
DESCRIPTION
Top Cover
Injection Molded
Top Cover
5ee Note 1
Drive Belt
Head Load Pad
Disk Drive (Single Sided) (E41)
Disk Drive (Dual Sided) (E44)
Harness Assembly
Shunt
Diagnostic Disk
Product Code Label (E41)
Product Code Label (E44)
NOTE 1: - The plastic injection molded cover has a lead
base paint on the inside of the top cover.
..... u
.~
'"""" • oJ
tUC-I'" t Lr- L...... ~ I LU''I
PL 4.3 Disk Drive Assembly (5.25" Single/Dual Sided~
600PB4592
5[IJ
/
l(JJ
7
8
(RXQ)"
4-6
4.0
PARTS IDENTIFICATION
PL 4.4 Disk Drive Assembly (8" Single/Dual Sided)
600PB4592
(usa) ,
ITEM
1
2
3
4
5
6
7
8
9
9A
10
11
12
13
14
15
16
17
19
A
ITEM
1
2
3
4
5
6
}
a
9
9A
XEROX
PART NO.
2P82083
~OlS547
3P80545
23P80122
55P80607
82P80437
82P80642
105P80376
105P80396
110P80470
113P1304
113P1305
113580667
127P1290
152581258
152581259
152581287
73580446
73580503
117P80447
19P80487
76520218
708W2001
Fuse 5A
XEROX (RXO)
PART NO.
DESCRIPTION
2P82083
6015547.
3P80545:
23P80121
55P80607
82P80676
82P80674
105580382
110P80470
113P1304
:,113P1305
10.
11
12
13
14
15
16
17
18
19
'A
DESCRIPTION
Top Cover (T5'C only)
Load Pad (5 per pack)
Disk Drive Indicator
Drive Belt (60 HZ)
Bezel (T5C only)
Disk Orive (8")55
Disk Drive (8")05
Power Supply
Power Supply CALT.)
Power Switch
Fuse Holder
Fuse Holder Cap
AC Receptacle Assembly
Fan
DC Harness
AC Harness
Signal Hamess
Diaonostic Disk
Diasrnostic Disk (820-II)
AC Power" Cord
Clamp
Disk Drive PWA (55)
127580376
" 152581258
152581268
152581308
152581292
152581307
152581287
130521804
152582370
152592371
152592787
19P80487
~/A ..
N/~
76580218'
, ,.70a.W01601
Top Cover
Load Pad (E42) (5 per pack)
Disk Drive lridi'cator
Drive Belt (50 HZ)
Bezel (U50)
"Disk Drive' Single Sided (E42)
Disk Drive Double Sided (E89)
Power·· Supply
Power Switch
Fuse Holder
.Fuse Holder Cap
Ac:Receptacle Assy (usa) (RXO PIa Item
.· •. Fgn
" DC Harness (USO)
,AC Harness (E42)
ACHamess Tao III (E42)
Ac Harness (E89)
AC Harness Tag III (E89)
Signal Harness
Diagnostic Disk
UK Mains Lead
European VDE Mains Lead
Swiss. Mains .Lead
,Clamp
Qata. Lai:lel(E42)
Data Label(E89)
DiskDrlvePWA
Fuse·2.0A
4.0
.'
600PB4592
PARTS IDENTIFlCA'nO
PL 4.4 Disk Drive Assembly (8" Single/Dual Sic
4.0
PARTS IDENTIFlCAllON
600PB4592
PL 4.5 Disk lliive Assembly (8" Fixed Drive)
-
ITEM
(usa)
XEROX
PART NO.
DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2PS2107
3PS0545
17PS0202
23PS0122
56PS0164
73'580503
S2PS0642
105P80403
I1OPS0470
113P1304
113P1305
113P80667
117PS0447
127P1290
152581301
152581302
152581303
152581322
1P80730
110P2340
Top Cover (TSC only)
Disk Drive Indicator
Foot
Drive Belt (60 Hz D.S.)
Bezel
Diagnostic Disk
Disk Drive Assembly S" 0.5.
Power Supply
Power Switch
Fuse Holder
Fuse Holder C~p
AC Receptacle Assembly
AC Power Cord
Fan
AC Harness
DC Harness
Signal Harness
Signal Control Harness
Base (TSC only)
Top Cover Inter ~ock
A
B
C
708W2001
99P3049
26P80459.
Fuse 5A
Fuse 2.5A (Package of 5)'
Top Cover Interlock
Screw
(RXO)
ITEM
XEROX
PART NO.
DESCRIPTION '
"
1
2
3
4
5
'6
7
's '
9·"
10
11
12.
~.
2P82107
3P80545
17P80202
23PS0121
56PS0164
73580446
82P80674
105580409 .
110P80470
, 113P1304
113P1305
'13
14
127580376
15
~152S81310
16
,152581302
t52S81303
17
181S2S81322··
";.19"lPSo.7JO
20
110P2340
. ~- --:-~~:,:.~:;;:::: _...~~.;: ~-:' -~~:_~:"'~."~f~''''-;,.\'''·.'
~~ ;;:~ .-,,"';'~::~V.."'·-~~:~-::,~,~ ~~-j;:'t ~·:·-'l.·~~t'"-- -~
,'708'1150'01
·4';'9."
7q~W09501
2~e:80459 .
Top Cover (T5C only)
Disk Drive Indicator
foot
Drive Belt (50 Hz D.S.)
Bezel
Diagnostic Disk
Disk Drive Assembly (8"D.5.)
Power Supply
Power 'Switch'
Fuse Holder
Fuse Holder Cap
AC Receptacle
Assembly Part of Item 15
See PL 4.4 item 16
Fan
ACHarness
DC Harness
Signal Harness
'Signal Control Harness
Base
';
,.. __"... T9P.9~~~z:}~~~~!~sk ..
Fuse4A
.,f~s~I.25t\, .·. c: ..•..••.'...•.
,...•.... " ...
'<,.
,J.oP'C;over· Inter.loc~ ?C::J:'ew
4.0
600P84592
PARTS
IDENTIF1CAnOt~
PL 4.5 Disk Drive Assembly (8" Fixed DriVt~)
4.U
PARTS IDENTIflCATION
PL4.5
arr Fixed Drive
600PB459:
DESCRIPTION
9
10
11
12
13
,J4
__ -.:!.? ..._,..
Stepper PW A(See Note 1)
10 MB Control PW A(See Note 1)
.10 MB' Control PWA (See Note 1)
Drive Motor
60 Hz Drive Belt
Spindle Lock
Ground Spring
Damper Assembly
10 MB Disk Drive (includes1 to 7 and 11 to 13)
AC Harness
DC Harness
10 MB PWA Interconnect Harness
Signal Control Harness
10 MB Data Transfer Harness
. Fixed Drive Controller PWA
Capacitor
152581301
152581302
76520209
152581322
152581305
82580692
(T5C only)
A
112W24410
5emsScrew (6-32 x 1/4)
B
112W36510
5ems Screw (8-32 x 5/16)
C
220W10904.
Self-Locking Nut (8-32)
Notel: 76520229 replaces 76520201 and 76520202.
(RXO)
ITEM
1
2
3
4
5
6
7
8
9
10
'II
12
13
14
15;
XEROX
PART NO.
76520201
76520202
76520229
76520226
76520206
76520208
·76520210
76520211
82P80672
.;1.52580301
"fS2581302
76520209
152581322
152581305
82580692
,.. 76520227·
DESCRIPTION
Stepper PWA (See Note 1)
10 MB Control PWA (See Note 1)
10 MB Control PWA (See Note_I)
Drive Motor
50 Hz Drive Belt
Spindle Lock··
Ground Spring
Damper Assembly
10 MB Disk Drive Cincludes1 to 7andll'toI3)
AC Harness·" .
DC Harness
10 MB PWA Interconnect Harness
5i gnalControl.Harness
10 MB ~Data' Transfer Harness
ControllerPW A
Motor ~apacitor
4.U
600P84592
PARTS IDENTIFlCATION
PL4.5 8" Fixed Drive
13
1.-....--12
10
[§JJ.
~
~~
%- .
. ..
...
C
[1]1
B
----~
4-12
600P84592
COpy QUALITY
600PB4592
THIS PAGE INTENTIONALLY LEFT BLANK
THIS SECTION DOES NOT APpLy
600PB4592
TROUBLESHOOTING
6.0 TROUBLESHOOTII\IG
600PB4592
6.1
Introduction To Troubleshooting
6.1 INTRODUCTION TO TROUBLESHOOTING
The XEROX 820/B20-IT is to be serviced using three major
fault isolation sequences.
1. Performance of the LEVEL 1 CHECKOUT procedure,
which includes visible indications and running Exercisers. '
2. Depending on the information obtained in LEVEL 1
CHECKOUT, you w111 be directed to access one or more
of the following:
'
a. Componentl Assem~ly ",placement.
b. LEVEL, 2 CHECK~ART procedures.
c. Exercisers.
3. If corrective action does not resultjn solvinQthe
problem, callforassistance from the TSC., (USO).
The' Check charts Yler~writtenwith the knowledge that,
if a certain· visible indicatiOn Occurs,.,several areas are
eliminated aspossibiUties. F'orthisreason,. it is absolute ly necesssi'ythafttle LEVEe 1 CHECKOUT procedure
be followed in the sequence given and that no exceptions
be made. F'or example, if you miss a visible indication
and later an error occurs, the CHECKCHARTS will have
assumedyousaw the visible and it was correct,therefore
some areas which could cause theerror'wiU not be
checked. The results w111 be the check chartswiU not be
effective. If an error does not occur, the performance of
the Level 1 Checkout will have eliminated most of the
possibilities and the remaining possibilities can be
checked quickly.
If you have spent a teasonableamount of time
(determined by local management) and do not see an
immediate correction to the problem, you should request
assistance from the TSC. TheTSCis your support in
solving the problem. (USO)'
6.2 Level 1
Chec~out
6.2 LEVEL 1 a-ECKOUT
EXPLANATION
Figure 6-1 shows a sample of the LEVEL 1 CHECKOUT
procedure. Notice the three columns.
1. Procedure - This column details the action(s) required
to perform the step.
2. Visible Indications. - Indications In this column iden'tify visIble indicaton of properly operating system.
Each of these viSUals must be Checked and verified
iin the sequence given. If the sequence Is not
·!followed, the LEVEL ~ accen canr')ot be~pended
I upon to properlYisolatelthefauUy, componefJt. _
3. iLevel 2 Ac~e81 - This column identifies the correcjUveactlon to take Ifone'of thevislbht indications
do NOT occur, is ,incorrect, or If a:F'ault Code is
reported, a number lrl' this column identifies the
LEVEL· 2· CHECK CHART procedure to use. In some
cas~~, you may either be directed to seethe replace
a part or you may be directed to continue to the
next visible Usted in the. Level 1 Check Chart. In,
other cases, you may be directed to "See NOTE."
!The NOTE. will be f~nd following the statement.
All notes within the LEVEL 1 must be followed. They teU
yoU what to do during or after the LEVEL 1 is performed.
A·visibleindication of the LEVEL 1 will reference you to
one or more of the following:
a.
LEVEL 2 CHECK CHART procedures.
b.
Component Replacement.
LEVEL 2
ACCESS
Cheek for abvloua problem.
Repair if IOlutlan II apparent
(refer to repair procedurea.)
Z. Remove any floppy dllCS from
driv...
3. TumtyltemOF'F.
.. Weit 10 lIICandi then turn
ayltem ON. ,
After 10 lIICandI
Procedwe 1.0
•••XEROX
la dlapleyed.
5. lnIert dlagnoatlc dlac In the
left handdlac drive.
ti. Type A an the keyboard.
Explanation
A dlaplayed an the acreen
F'igure6';'lSample LEVELl CHECKOUT
Keyboard
ProcelllOr' PWB
Keyboard Harnea
, 6.0 TROUBLESHOOTING
6.3 Level 2 Checkout Explanation
600P84592
6.3 LEVEL 2' CI-ECK CHART
EXPLANATION
4. Test Point - The column identifies how or where to
check the procedure statement•. If a voltage reading is
to be made, the first entry is for the RED or (+) lead
and the second entry is for the BLACK or (-) lead. If
no second entry exists, the BLACK lead must be
connected to any good machine frame ground (not on
painted or non-metallic surfaces). Chapter 4, (PARTS
LIST) or .Chapter 7, (PLUG/JACK LIST) can be used to
locate the component or plug/jack where the test is to
be made.
Figure 6-2isa sample of a LEVEL 2 CHECK CHART.
Notice the different column headings.
1. Within this box is
procedure.
th~
number and'name of the Level 2
2. Step - This column lists the number for each 'step of
the procedure. Not all steps will be performed. Only
perform those steps necessary to Isolate the faulty
components(s).
5. Correct· Indication - If the voltage or visual observed
was CORRECT or occurred as stated In the procedure;
this column will either direct you to thenext place to
continue troubleshooting or it will direct you to
replace a component or perform an adjustment.
3. Procedure·- This column describes' theset.;up required,
If any. If It is avoltage,~e t"olerance is given.
All AC voltages will be written as VAC, and all DC
voltages wlll be written as VOC. Always tum the system power off .when disconnecting/conne~ting'plugs or
removing/inserting PWA's. DC voltage are to be
assumed positive unless a mlnus'(-) Is' shown prior to
the voltages.
6. Incorrect Indication - If the voltage or visual observed
was INCORRECT or did· NOT occur .as stated in the
procedure; this columnwiU either, direct yo~. t~ the
next place to continue troubleshooting or it Will direct
you to replace a component or perform an adjustment.
These stepS must be followed as lilted.
6QOP83aOO
STEP'
to
1.
PRoc::EI:)U!E . .•.•. . .
__ XERox.
·(s
i ..
(y .. .
NOT Ot". "Cfm--.
~
Meuure voltage
Input
of Pow.- Supply, vol~'
IhouId be within !2..!!::!!!
130 VAC.(USO)
TEST
POINT
Pll.'
lNJlCAnQ\I
CORRECT
(;'\
\!.J Step z
J!:CORRECT
CD
. Chectc wtrtng
InC! $0.1 between· .....
pow.. cordMd
power wpply.
m:mYAC .Or US-Z64VAC
~O)0
Pow.. Supply
MnaIN voltllllll at
gutputof Pow.. Supply,
vol~ 1hoUId' be within
U' InC! 5.25
yoc
........ Voltllllll ~output
'ofPOWWSuppiy, voltllllll
P,.-
PowwSupply
&(.)
PS. Z(.)
Ihouldbe~
...
Checlc BrightnMe ~
. POtlItdarneun ,. . . .
, Pl.'(·)
Pl· Z(.)
step 5
PotentIometer.
Vo1~ 8houJd 90 .between"'
OVOC MdlSO YOC
WhenrnavlncJ
.Figure 6-2 Sample LEVEL 2 CHECK CHARTS' .
6.0 TROUBLESHOOTING
600P84592
6.4 Levell Oleckout Procedures
LEVEL 2
STEP, PROCEOlRES
VISUAL INJICATORS
ACCESS
1. Check for obvloua problem.
Repair, If solution Is apparent
(refer to repalr'procedures.)
2. Remove any floppy discs from
drives.
,. Tum. system OF"F'.
4. Walt 10 a8Condsthen turn
system on.
NOTE: Dispiay for 820 Systems
...XEROX 820 VER.X.X...
A-BOOT SYSTEM
T-TYPEWRITER
After 10 seconds
NOTE: Display for 820 II System
820-11 VER. XX 1982 XEROX CORP.
L - LOAD SYSTEM'" "
,
H- HOST TERMINAL
T - TYPEWRITER
s.
Procedure LO
Procedure LO
Insert, diagnostic disc
In the Jeft disc drive.
6. NOTE: -This step does not apply
to the'Flxed Drive. -,
Insert initiallzed disc
in right disc drive.
.
7. Type A for 820:
Type L A for 820-11
A displayed on the screen
L A displayed on the, screen
.8." NJTEi Do'nofpressany keyes)
~~,:"DI!P."",_,l,ay. f~, 820 SYI,te,ms" ,~,.
COPYRIGHT (C) 1981,XEROX CORP.
CP/MREG."TM X.X oI X.X (Serial No.)
while dia9nOs~Jcs ~erunning,
after pressing the return ,key, ,:,.
unless inStrUCted to do so
Preathi'R]::TLRN'key "
NOTE. , D~lng th~ remainder of
Level I,'" at any time a disc
error,is displayed" perform Procedure
'.0. , This note does not apply
to 'the, OOISK' Procedures•.
Keyboard
Daughter PWA (820 II
Only)
Processor PWA
Keyboard Hamess
Procedure 2.0
(Procedure 6.0 for
Fixed Drive System)
NOTE: Display for8Z0'II SYstem
820-tt XEROX 60K CP/M VER. XX' XXX.
Error:Message Displayed
Procedure
,.0
9. Observe thevlsuallndicatora
while the foUowlrigtests are
running. and respond accordingly.
,..
o
o
MTEST
0001
MTEST2
MAP OF TESTED MEMORY
Passes complete = 0001,
Count of Error Bytes. 0000
MAP OF'TESTED
Processor PWA
~MORY
,Paases ,complete, .0001
"";"'Count> of Error Bytes.OODO
Proceasor PWA
6.0 TROUBLESHOOTING
6.4 Level 1 Checkout Procedures
600P84592
The data in these columns
will vary from system to
system but the format wlll
. th
!. .
The data in this column
will remain the same for
all systems.
rem"In rme.
10001~7-8-C-3-F-3-0-0-E-l-F-1-CA-2-8-0-E-2-3-2-2---B-9~0:--F-E-B-2-1-A-8----X-.'1010 06 4E 23 46
co
••-,.-.-.-(~~~II-=-~'~.-~~- .-~!'
."'-cl
S7 08 OA 28 DE CO C8 00 2A 4A OF .N#F.W •• ( •••• *J.
1020 EB 3E 82 B7 37 C3 8S 08 FB 2A 40 OF 1C BS CA 4E.> •• 7 •••• *M.:
1030 DE 2B 22 40 OF CD 1F DC C2 4E DE 3A 4C OF 87 C2
.+"M ...•• N.:1
.. N
•••
01040 48 OE' CD '8S DE C3 8S 08 CD, '44 00 C3 8S 08 CD C8 H •••••••• D••••••
10S0 OD 3E 2A CD C7 DB 2A B9 OF CD 93 og D2 62 DE 22
*
.>*
1060' OC 00 CD 2E DC 2A B7 OF 22 SO OF C3 FE ·0611 .OD ••••
b."
'.* .. "]
.
1070 00 21 2F OF 7E AD 23 BE 23 CA 81 DE 14 lD C2 74 .!/.-.#.# •••••• t
1080 DE SA 16 00 C9 2A B9 OF 4623 ES CD 6E OE 21 49 .Z •••.
lOgO OF 73 21 9C DE 19 19 SE 23
s6
*. . FII • • n.!I
EB E9 B8 DE EO DE .s! .... ""f/V ••••••
"
10AO B8 OE EO odE BE OE F2 DE 04 OF 26 OF 26 OF' 23 OF ••••.••..• &.&.11.
1OBO .?~._,.OF
'.9.'
OF 26 OF 14 OF CD CE DE C2 29 OF CD P9 il ••• & eo' • • • • • •
cd 3AA906 BA C9CJEl
10CO DE C3 2'9·"OF
,',
• •- •
..' .-. . .... . . . . . .
.. ) .
~
10DO SE 23 S623 E5 CS·<C3C4 DE 2A BS OF SE 23,S(j;,c;9 .~fIVfl•• ,• ••
:i<-~!':'
)
*.. AIIV.
10EO CD CE DE CA ED OE C1 CS 3E 02 C3 2B OF 01 DS C3 •••••••• > •• + ••••
10FO 29 OF 78 FE. FF C2 FC OE~AF"-·C3
20. OF E638 SF' :16 ).~ ••••••• - •• 8_.
Figure 1-1 Disc Data Log
o.u
600P84592
t KUUtjLt..~HUUTING
6.4 Levell Checkout Procedures
STEP PRQCEOlRES
o
.
VISUAL INDICATORS
o Read/Write errors detected
o See~ errors detected
OOISK
LEVEL 2
ACCESS
Procedure 7.0
Disk test
Read/Write test
Random seek test
Read Write test
NOTE: 0"5.25" disc drives only
if an Initialized disc was not
inserted In drive B, a bios and
drive not ready wUl be displayed.
To continue test, press the CTRL
key and type CC. The screen wll1
display a Bdos Err OnB:
Select wUl be displayed.
NOTE: If printeris.not ON/CONNECTED,
test wll1 stop, after this step.
o
TERM
Diagnostics n Vl.l
Terminal test
Test patterns look normal on
the screen
'
Procedure 4.0
o
PRINTER, TEST
Diagnostics n - Printer
Exerciser. vl.6
(630 'only)
Printer test pattern is normal.
Printer Service Manual
Printer Inoperatl ve.
Step 11
OOlBLE SJDE DISK TEST
5.25" DISC DRIVE
10.' Reset machine when printer test
Is complete and leave diagnostic
disc In drlve A.
A.
Enter in the following from
the keyboard:
RO'4F 11\1(1(1.' Press RETURN
111::'
. . . c-c::...F"iratMemAddrestl .
.,
....
'.' ....•..'. . . . . . . . . . . . .•'. . ." stored'
that di..S.C.·(),. • . ,.,.I.
Sector Address,
Track' AddresS'
Drive Address
a.t~
S.....
.
'~"
Memory addresslOOO-l0F"0
disc OATAwlll
\bedlsplayedon the· screen
"In the same format as
Left Drive
c~ntalning
tlgur~
1.
B. NOTE: This test drive B of 1\
Double sided disc only.
Enter In the following from
the keyboard
R14F" 1 1\1(1~
Memory Address 1000-10F"0
containing disc data wl11
be displayed on the screen
Inthes8me format as
F"lgurel.
,--,~~ '.~ .' '~~.' __ ~- • c,"
.'
Right Drive
600PB4592
6.&\., Levell O1eckout Pr.oeeduares'
VISUAL N:>ICATORS
STEP PROCEOlRES
LEVEL 2
ACCESS
8" DISC 0R.1VE
Reset machine when printer
test is' complete and leave
diagnostic disc in drive A.
A. NJTE: This will test the
second side of a double sided
. disc. NtA to single side cIlsc
Enter in. the following from the
Keyboard
R" 4011"""
Memory Address 1000-10FO
containing disc data wUl be
displayed on the screen in the
same format 88
Figure 1.
Left Drive
Memory Address 1000-10rn
containing disc will be ..-, ..
displayed on the screen in
thessme formatt as
Figure 1.
Right Drive
Memory Addresa 1000-10FO
containing disc data wlll
be displayed on the screen
In the same format as
Figure 1•
Left Drive
B. NJTE: This test drive B. of A
double sided disc only.
Enter in the following from the
keyboard
R1 40 1 1"""
F1XED DRIVE ASSEt-.el.y
Reset. machine when printer
test is complete and leave
diagnostic disc in drive A.
A. NJTEa This test the second side
of drive A.
Enter In the following from
the keyboard
R!l40 1 1"""
B.
EnterthefoUowing}~
the keyboard.
R4 I1F 1"""
R4 1 'F' 1""" .
-.
. M~moryAddr~~'loOo:'ioFO
contalningdlsc data wlll
be displayed on ti'\e. screen
in the same format as .
Figure 1. .
. .
Same as Step 1;5.
Procedure 7
Step 2.
Procedure 7
Step 2.
~4 1 SF' 1""l,1
Procedure 7.
Step 2.
R41 7F'1""l,1
Procedire 7
Step 2.
o.u
600P8459Z
lKUUDLC-.:n'uu , u 'Cur
6.4 Level 1 Checkout Procedures
STEP PROCEOl.RES
VlSUAL NJICATCRS
LEVEL 2
ACCESS
11. PRINTER LOOPBACK TEST
Turn system power off.
Install loopback tool on Proceasor printer connector.
Turn system power on.
. ENTER ~ preas RETURN.
ENTERI\15 preas R,ETURN.
~5 05
Processor PWA
~5 2A
Processor PWA
Press spacebar.
ENTER ~ press RETURN.
ENTER 1115 press RETURN.
i
Press space bar.
ENTER
I
Q!£j! press RETURN.
ENTER Q(j5 05 . press RETURN.
ENTER I(j5 press RETLRN.
f6505
Processor ""PW A
~5 2A
Processor PWA
Press space bar.
ENTER .0(15 2A press RETURN.
ENTER 1~5 press RETURN.
If Printer LoopbackTest Is good, high probability 820 Processorls not at fault.
Use your P1/1730Servlce Manual to repair Printer•
.. 12. COMM. LOOPBACK TESTTurn system power off.
Instaliloopbacktooion Processor Comm. connector.
Tum system power on.
. ENTER CXl6~4 press RETURN.
ENTER CXl645 presaRETURN.
ENTER OG6~1 press RETURN.
ENTER Q(J6 ~11 presS. RETURN.
ENTER ,,"6 f63 press RETLRN.
ENTER ·CXl6 41presa. RETLRN.
ENTERCXl6< "5 press RETURN.
ENTER ~6 2A preas RETURN.
ENTER~(1 f65
press RETURN.
ENTER 0fI4 05 press RETURN.
ENTER 1(,C4.· press RETURN•.
(,C405
Processor PWA
Press space bar.
cent..
6.0 TROlBLESHCXJTlNG
·600P84592
6.A Level 1 Oleckout Procedures
STEP PROCEDURES
VISUAL INDICATORS
LEVEl. 2
ACCESS
ENTER O~4 ZA press RETURN.
ENTER I~4 press RETURN.
~4
ZA
Processor PWA
~4
OS
Processor PW A
~ZA
Processor PWA
Press space bar.
ENTER 0(I1f~7 press RETURN.
ENTER O~4 OS press RETURN.
ENTER I~4 press RETURN.
Press space bar.
ENTER ~4 ZA press RETURN.
ENTER 1~4 press RETURN.
If Comm. Loopback Test Is good. high probability 820 Processor Is not at fault.
6.0 TROU3LESHOOTING
600P84592
STEP
6.5 Level 2 Check Chart Procedures
... XEROX
1.
Z.
,.
TEST
POINT
PROCEDURE
INDICATION
CORRECT
~ORRECT
Is NoT dISPLAYED
Measure voltage at input
of Power Supply, Voltage
should be within 90 and
l'OVAC
--
Measure voltage at
output of Power Supply,
voltage should be within
4.75 and 5.25 VDC
Pl1·'
Step Z
Verify AC Source
Voitage
Check wiring
and 5-1 be tween
power c:ord and
power supply.
NOTE: If processor
Is plugged into
Drlve Box check
Interlock Swi tch
on Fixed Drive and
fuse F-Ion rear
of box..
P5 - 8
P5 - 4
Step'
Measure Voltage at output
of Power Supply, voltage
.should be ·12 VDC.
P5 - Z
P5 - 4
S~ep
4.
Check BrightnesaControl
Potentiometer:
PWA
When moving Potentiometer,
Voltage should go between
OVDC and 150 VDC
Pl-2
P1- ,
(Brightness
Control PWA)
Step 5 .
5.
Me~ video output
voltage shouldbe
.1 VDC to .4VDC
Jl- 8
. Step 6
J1 ': 1
(Monitor PW A)
Verify shunt_,c~figuration
figure
Processor PW A
6.
Measure horizontal sync,
voltage should be
, 1.8 VDC to '.OVDC
Step 7
J1- 6
J1-1
(MonitorPWA)
Processor PW A
'Me~sJre"Verticalsyri'b~
'J1";9
J1-'l
step 8
Increase • brightne's~;q~n~l
anmoaiitor PWA,'urltU,raster
is visible.
"""
Raster
visible?
Daughter PWA Monitor
Processor PWA,
voltage should be . .
'.8 VOC· to 5.2VOC.
8.
z.o
Power Supply
4
Monitor PWA
Brightness Control
'.8 .
. Proeeaaor PW A
COPYRIGHT (C)':1981, XEROX CORP.XEROX
NOT DISPLAYEO';'~.··;·
1.
Depress Reset Switch.
Z.
Insert Diagnostic .d(~'iri .~lght',dri~:e.'.
,~
Type Barl~~pre~ RETURN
NOTE:On820-II,typeLB and return.
COPYRIGHT (C) 1981, XEROX CORPORATION
CP/MREG. TM X.X 01 X.X,<Serlal No.)'
bios select error drive not ready
Visual
Clean Heads
on Left Disc
Drive.
Check motor
apeed').'.4
5.25" ,only,
(Left disc
load pad
·'ainc;Jle,.. ~ide
'drlvei
Verify Diagnostic
Disk
Procedure 5
ont'y)
Leftdlac
"dri've" ,"'.
'6-9·
6.0 TROLBLESHOOllNG
6.5 Level 2 Check Chart
600P84592
------------------------------------------STEP
TEST
POINT
PROCEDLRE
3.0
IN:)ICAl10N
CORRECT
INCORRECT
ERROR IS DISPLAYED
NOTE: .Clean drive heads repeat Levell
checkout.
5.25" Disc Drive
1.
Verify Diskette Processor PWA
Check motor
Daughter PWA
speed '.'.4
Signal Hamess
(820-11 only)
Load Pad
(Single side only)
Reconfigure (strap) the left drive
for physical drive B, and the right
drive for physical drive A by
swapping the shunts and instalUng
the resistor network on the left
drive.
Left disc drive
2.
Repeat Levell checkout
thru Step 9 wi th the
Diagnostic Disc In t~
right disk drive.
8" Floppy Drive
1.
Verify diskette
Move DSI Jumper to OS2 on drive "A".
Move DS2 Jumper to DS1 on drive "B".
Daughter PWA
(820 n only)
Load pad
(single side only)Processor PWA
Left disc drive
Daughter PWA
(820-11 only)
Processor PWA
Signal Hamess
Repeat Level 1 checkout,
thru 5 tep 9 wi th the
Diagnostic Disc in the
right ,disk drive.
,I.
Memory,
Address
1000-10FO
containing
disc data will
bedlaplayed
the screen
in the same
format as
Figure 1.
Reset machlne'and enterJn the
following from the keyboard:
R4 .'~ lJ '11111lJ press RETURN
on
4.0
1.
5.0
Signal Hamess
Verify Diskette! Daughter PWA
Left Drive
(820-11 only)
Signal
Control
Hamess
Processor PWA
Fixed Controller
PWA
Signal Harness
TE;ST PATTERNS NOT CORREC!LY DISPLAYED
Visual
Entire Screen is
distorted.
0:
COPYRIGHT (C) 1981, XEROX CORP.
NOT' DISPLAYEO
5.25" DISK DRIVE,
"iMeaslJreVol tageat .input of
Disc Drive, voltage(s) should
be:r";i~f'~\$\I.'.
.:
.
,
Adjust moniter pwA '.1.2
Processor PWA
6.0 TROLBLESHOOTING
600PB4592
6.5. Level 2· Check Chart· Procedures
STEP
PROCEDLRE
TEST
POINT
N)ICATICJIoI
CORRECT
INCORRECT
a)
12VDC
P/J2-1
P/J2-2
step b
Check wiring between Processor
PWA and drive.
b)
4. 75 to 5.25VDC
P/J2-4
P/J2-'
Step .2
Check wiring between Processor
PW A and drive.
2.
Power down, then disconnect
signal harness from Disc Drive
(B). Power up and insert DIagnostic Disc in disc Drive (A),
type A and preas RETURN.
€DPYRIGHT
displayed
MTEsT RlA'Is
Disc Drive(B)
Power down, and reconnect
drive (B), disconnect'lignal
harness from Disc Drive (A).
Power up .andinsert .diagnostic
disk in Disc drive (B), type B
and press RETURN.
_ _
,NOTE: If 820-nsystem, type La .
and press return.
COPYRIGHT
BIOS lelectERROR
drive not
ready displayed.
Step'
Signal Harness.
,Disc-Drlve (A)
Signal Harness'
Daughter PWA
(820-n only)
,Processor PWAi
Signal Harness
8" DISK DRIVE
1.
Mealure input voltages
at disk drive (3.4.4)
figure 3-24 •
2.
Power down, and disconnect
signal hamess from Disk Drive
(B). Power up and insert diag.nostic disc· in drive (A), type
A and press return.
~ower down and -removeTJ, T4,
T5,T6 from disk Drive (A),instaU them on Disk Drive (B).
Reconnect Disk Drive (B),
disconnect signal harnessfrom Disk Drive (A). Power up
insert diagnostic disc In·. disk
drive (B), type B and press return.
NOTE: .If 820-lIsystem,type LB '
and press return. .
6.0
1.
step 2
-Check F'use
drive power
supply
COPYRIGHT
displayed
Disk Drive{B)
Signal Harness
COPYRIGHT
BIOSsel.;.
ect'ERROR
drive not
ready displayed.
Head load pad ,Daughter PWA
(820-n only) .
Disk Drive (A)
-.
Processor PW A
Signal HarSignal Harness
ness
step'
XEROX CP/M 60KVXX
NOT DlsPLAYEO
Verify int"erlock-engage.
'.;' Refer to Procedure 3.5.9~
NOTE: This manually reads
datafrorn the fixed drive.
Depress reset switch -and
type in:
R4:" "-1""" pre8lRETUR~
Memor)'
iClean Left disc:
heads
1000-10F'O,', "'Verify
containing
diagnostic
~Cflscdatawil1 disc
;:iwill be .. :;,/,;Z· Leftdisc
displayedonr> Drive
the acreen In'
Address~··
?:~i[;~~'l~;~.'~:~7~t.'
Step'
6.0 TROLBLESHOOTlNl:i
6.5 Level 2 Check Chart Procedures
600PB4592
TEST
STEP
PROCEDlRE
J.
POII,'lT
Power off and disconnect
p~wer cord. Remove. top
cover (procedure J.5.1)
Disconnect PI from 10 meg
Byte board. Reconnect power
cord, ingage top cover
.
interlock and power on.
Insert diagnostic disc In
left drive. Type LA and press
RET.URN.
._."
.. _ _
NqTE: Th,ls manually reads the
fixed disc.
INJICATION
CORRECT
INCORRECT
Xerox CP/M
10MB
60K VER. XX
Control
PWA
Displayed
Step 4
Remove 'disc from left drive
Power off and unplug power
cord. Recomect P J-1 on
10 Meg Byte controlPWA.
Discomect PJ-10nS" drive.
Recpl')nect power cord and
power on. Reset machine
and· type In: .R4 .~I;f .11;f~{I
5.
Measure voltage at output
of the disc drive power
supply connector PJ-J,
voltage should be -5VDC
!. .25 vdc.
6.
Measure voltagrrA1 output
, ofthe·dlscdrive power
supply connector PJ-:S,
voltage should be +5VDC
!. .25vdc.
7.
Measure voltage at output
of the disc drive power
supply comect,o~ PJ-:S, ,
vo.tageshouldbe +24vdc
·!~.2 vdc
Measure voltage at output
of the .disc· drive power
supply comectorPJ-:S,
vol tage should be + 5vdc
.: .25 vdc.
Measure voltage at output
of the disc drive power
supply connector PJ-:S,
voltage should be, +24 vdc,
£1.2 vdc
.
8.
9.
10.
Measure voltage at output
of,the disc drive power
supply connectorPJ-J,
voltage should be - 5 vdc
+ .25vdc
-
'
.' 7.OQDISC ERRORS,
.) g"r'. ~- '.,'
1.
Ii;'
'-'~'\
If error verify 'floppy diskette
.c ',.dsgoodandrepeat level 1
" ·.;check'out';,,::?;;
';"Clear.heads1"end',rer ,eat
leve(.1"chec'kout ,.,
,;
.
6...12)'
',.--
-
~
--
"',
'
- - - . - '.,
,-
'.
_~.
- --.0:;",
;,;t:-"
;.~-'
:-;" ",
Error displayed
on screen
Step 2
Error dlsplayed
on screen
Step
:s
b.U t
600P84592
STEP
. ::5.
KUUjLt..~HUU
I lNG
6.5 Level 2 Check Chart Procedures
PROCEDl.RE
TEST
POINT
Errors displayed when
checking drive A only.
Repeat level 1 to checkout
the drive after doing each
step under the correct column.
Drive A disc
error
displayed
on screen
IN)(CATION
CORRECT
INCORRECT
Check motor
speed (5.::55")
Step 4
Load pad on
single side
drives.
Replace drive A
Daughter PWA
(820-[[ system)
Processor PWA
Signal Harness
4.
Errors displayed when checking
Drive B only. Repeat level 1
to checkout the drive after
doing eachstep under the
correct column.
Drive B disc
displayed
on screen
Check motor
speed (5.25"
only)
Step 5
Load pad on
single side '
drives
Replace Drive B
Daughter PWA
"(820-II system)
Processor PWA
Signal Harness
5.
Errors when, cr.ecking,drives
A andB~Repeatlevell
checkout afterdoi"geach
step.
'
Error
displayed
on screen
Daughter PWA
Processor PWA
Signal Harness
FIXED DRIVE ASEM3LY
Verify floppy diskette in
drive A. Repeat level!
checkout'
.
errors
displayed
Step 2
'Errors ,Indicate-problem
on drive A.
Errors
displayed':
on screen
Drive A
::5.
Errors indicate p'roblem'
on 'drive B: "
Errors
displayed
on screen
Step 4
4.
Remove topcover,engage top
cover interlock switch and
power up thediscdrlve.
Disc drive
motor is
rotating
and belt Ie
In place.
Step 7
1.
Step'
Repeat Levei 1 checkout
Motor not,
turning,
Go to stepS
Belt off pulley
Go to step 6
6-13
6.5' Level 2 Check Chart Procedures
STEP
PROCEOlRE
5.
Check AC input to motor,
vol tage should be 115 vae
600P84592
TEST
POINT
P/J-4
Pins 1 to 3
IJ'DICATION
CORRECT
INCORRECT
Check for
Bind.
.
Identify why
voltage is not
present at motor
Replace motor
6.
Disc drive belt off pulley
Visual
Replace. drive
belt if worn
or broke (3.5.6)
7.
Check damper for 011 leads
leaking 011
Replace damper. 10MB PWA
(3.5.7)
Stepper PWA
Fixed controller PWP
Disc signal Hamess
Step 8
. CAUTION
The following procedure can
et"8S8 all customer fUes.
Verify the customer has
backup fUes on floppy dlac so
they can re-enter the data erased.
8.
Check the integerity of the fixed
fixed disc media by running the .
followi.ng backup procedure:
A.
Insert CP/M disc in left driye
B.
Press. reset
Step B
Repeat Step A
Repeat step B
820-II
VER.XXX
1982 Xerox
Corp.
L-LoadSystem
H~ost .r erminal
T;'Typewriter
C.
.Enter L A on the keyboard
820-II
Xerox
Step 0
Repeat step A & B
60K CP/M
VER.XXXXX
6...14.
o.
,Erlter BACKUP· on the keyboard
and press RETURN·
aackup menu
wlll.be
displayed
on screen
StepE
Repe at step 0
E.
Enter 4 on the keyboard to
verify discin~l!'grity
Screenwlll
display:
Vertlfy which
disc
Step F
Repeat step E
F.
E:nter E on the keyboard
Program willbegin to run'
wi th increment
block counts
displayed on
screen, on.
which bad: .
.blocks 'may.
appear.
.Ifblock
count is
completed or
badbiock
appears go to
step 6.
Step 9
b.U I KULJtjLt:.:>t"1UU I lNl:i
600P84592
6.5 Level 2 Check Chart Procedures
STEP
PROCEOl.RE
G.
If program shows any bad
blocks they should be
accepted .:Jy (typing A) so
program will continue. If no
bad blocks appear program wf11
complete. Then press Return
H.
Touch return again
I.
Repeat steps A through H
substituting (F') for drive
to be verified
J.
TEST
POINT
IN:>ICAnON
CORRECT
IN:ORRECT
Step H
Step 9
Step I
Verify CP/M
disc
Same as A
thru H
Step J
Step 9
Repeat steps At~rough.H
substituting (G) for drive
to be verified
Same as A
thru H
StepK
Step 9
K.
Repeat steps A throughH
substituting (H) for drive
to be verified
Same asA
thro H
Step L
Step 9
L.
Return system to customer
after call management. In.form
thecusto",er. that the system wl1l
no longer allow them.toaccess
the bad media.
Now~go. to step
9.
F'ormat fixed disc media by
performing the following
procedure:.
Step B
Repeat step A
,Insert CP1M· disc in drive .~
StepC
Repeat step
A thru B
E"terL Aonkeyboard .•. anet
press RETURN
.,.
"
Step 0
Repeat step
A thru C
A.
B.
All done
Touch any
key to exit
Back up menu
. wf11 be
displayed
on screen
. Reset system
StepE
Initializing
will erase
all the data
on the fixed
disc touch
(any key) to
exit or (return)
.. to Continue
Repeat steps
AthruD
StepF'
Repeat steps
A truE
D.
EnterF'MT on keyboardancf .
press RETURN
E.
Press RETURN on the keyboard
to continue
Are you sure
you want to
continue
F'.
Press Y on the keyboard to
continue
Press reset
Tracks being
and repeat
initialized
step 8
wUl be
displayed
on the screen
and wUlcount
up to 102)
10 tva disc dri ve
6-15 .
6.0 TROUBLESHOOTING
6.6 Chain 1.1 AC/DC. Distribution
600PB4592
SYSTEM WITH 5.25" DISC DRIVE ASSEMBLY
(RXO)
51
P1 J1
•
ACL 'cr"i""'oJ--3----.
•
I'''''''""''
ACNt~ + I 1 .!J..2SA
I
MAIN PWA
"101
GNO
J8
+12VDC
P8
,2 •
J~7:::TEMGND
POWER
SUPPLY
: 2+
,,,.........oL- 3 ~
ACL . .
ACN
P1
:
J1
~ 2.5,..
..;...;.,;;;;.;.;....---~ 1 -
GND
/Jj
Li l
_
JG~N~O~·_.
L.:
~5
•.
•
'
:
I
---:~_ _....r--_-..J7:
'.
•
BRIGHT-
;
NESS
BOARD
CONTROL
:
.B~11-~_'_-21
.....---~.....;.--'
.... 51
+12 VOCCCRT>
'1
P
',0.l..
KEY-
..+-.-;D::;.C~R..:.:::E::..;·T~__
' <4.l.
DC RET
r
P1
7.
I
GND
+12VDCCOISK) • .3~
DC RET
1 .
~
/
-3
-12VDC
PS.J!5
J-.f.';';:12:"'V;"::O:;";C;;"C-C-PU-)-' 1 ,
S1
J1
6+
7+·
I
)..!...
'3'
A..!-
, 2
,
~.
1-+;".. =.5V.. ;. ::;.D.=C_ _~ S"!"
•
1-+;"...=.5V.;.D;;;.C,;;;...
92..
l_
J1
. P1 ... 12 VOC
T 'S ,.
.1-36"
,
..L 19
I
I
1 37 ':
... ,2RET
P2
5
DISK
DRIVE
J2
, '7
+5VOC
, 2-!...
• •
, 4..!...
+5RET
, 3..l...
,
I
P2A
"
~J-----,
t -----J2..l
1
;::::::;:4.1
I'
I
lJ--":="'---=-'
3...J.
~C2
1_
rtJ2
- AC/DC DISTRIBUTION
f-J-~
6.0 TROUBLESHOOTIN
600PB4592 .
6.6
lBl
p
8" DISC DRIVE ASSEMBLY (US)
AC/OC DISTRIBUTIt
LH Dt$G DRtv!.
I
~:
2
J,!t
"I-
,":"
O-+--~------------;-·5
0--1---1------------;---..,
B"DISC DRIVE ASSEMBLY (RX)
P1
_--f.-------t-~
_---.t...:<t
O--------+--~
E5
,
I
=J
.P5t~J
6-
· 6.0 TROUBLESHOOTING
6.6 Chain 1.1 AC/DCDistribution
TH I 5 PAGE INTENT I O'JALLY ·LEFT BIJN<
600P84592
6.0 TROUBLESHOOTING
600P8459Z'
6.6
At/DC DISTRIBUTION
FIXED DRIVE ASSEMBLY (US)
P4
~--++----------------:-1: I :
~I---------:------------:- 3 -
F1
I,
POWER
SUPPLY
•(
+~vOC
RECEPTAClE
ASSEMBl.Y
zt -II ....+....2 ......V....OC
II
• I •
1 2 I
,r;- -
\:Of 1 eI!..I
1--5-
.P5
I
f-I..:;2...;.
.. V.;..R;.;.;E.T--I-.....-
: I :
1----6-
: I :
l--tI I I
: I :
2_
~2-'
: -'''DC
: I :
+.--mc;;..;..;;....a---......,t----:-~ ~:-
•
--,
t
m
ti-...;.:;=~t-t
AN
D
I
I :
:
-t--1lI:--_ , _
. •
IZ
•I
I
3-
p.1
~
I
, 5 I ~VRET
•
1
I
~2.!...
JJlP3
,. ,-
....-
3-
J4
-1
I
1
1
t2"VOC·
FIXED DRIVE ASSEMBLY (RX)
p,
1---4-------------------:-'-
P•
.: I :
S1
o----t
1-
1.------------------:-3~2.!I
:
• I •
E4
POWER
o--------it---'1"E.1
SU~PLY
JJ/PJ,
.
'+~voc
1(• .'
,r;- I
J---5: ,:
P'5
~I~I
IPS
~I_':.V;..:R-E T-.....~-_I e"!'"
t
:
I :
~e­
~'t.· ..
+-.2.....V
...OC'___-t--4t:--_ 1 _
RECEPTAet.E
; ASSEMBLY
I
t
: I :
~1-
II
~I _2_
..V_R_E....T--t~-e:-_ 2-
: I :.
+----........--"t-1t----:- " - 1
&_·-5VD=c;.;;i;::.;E'f-lr-+......_
,I
1
Cl
AXED,
tOm:w-
I
'IO'JIII
~I:--:-.:..:.:::;.z.,--t-t--t---:."' 5-
,
I .l•
~I__.;:;.'V_D_C:::..-+-,I-+__ ,
FAN'. .I
'ps
I
: I :
~2-
LJ
1. •
1-
I
I :
3-
I I •
1 2 1
7
I
1
3(.1
+
"VOC
I
t
.!
I:
s-
I:
,II
2-
6.-19
600PB459Z
PLUG/JACK LIST
7.0 WIRE DIAGRAMS
600P84592
7.1 PluglJack Location·
REF
CONNECTOR
FROM
TO
1
Pl/Jl
Brightness Control
PWA
Mon"itor PWA
(Pl/Jl)
2
Pl/Jl
MC?nitor PWA·
Brightness Control PWA
(Pl/Jl).
Processor PWA
(P6/J6)
Processor PWA
(P7/J7)
3
P5/J5
Processor PWA
Power Supply
(Pl/Jl)
4
P6/J6
Processor PWA
Monit.or PWA
(Pl/Jl)
5
P7/J7
Processor PWA
Monitor PWA
(Pl/Jl)
1
2
7.0 WIRE DIAGRAMS
7.1 PluglJack Location
REF
600PB4592
CONNECTOR
FROM
TO
P2A/J2A
Right Drive
Processor PWA
(P1/J1) <
2
P2/J2
Left Drive
Right Drive
(P2A/J2A)
3
P1!Jl
Left Drive
Right Drive
(P1A/J2A)
4
P1A/JIA
Right Drive
Processor PWA
(P1/J1)
.1
5
P31J3
Left Drive
Left Drive
PWA
6
P3A1J3<A
Right Drive
Right Drive
PWA
1
7.0 WIRE DIAGRAMS
600P84592
REF
1
7.1 PluglJack Location'
CONNECTOR
P1/Jl
FROM
Power Supply
TO
AC Power Cord
Power ON/OFF SW.
POWER SUPPLV
600PB4592
7.0 WIRE DIAGRAMS
7.1 pluglJack Diagrams
REF
CONNECTOR
8" Disk Drive
FROM
TO
1
P2/J2
Right Drive
Power Supply
(Pl/Jl)
2
P2A/J2A
Left Drive
Power Supply
(Pl/Jl)
3
PIA/JIA
Left Drive
Right Drive
(Pl/J2)
4
Pl/Jl
Right'Drive
Processor PWA
(Pl/Jl)
5
P4/J4
Right Drive
Terminal Strip
6
P4A/J4A
Left Drive
Terminal Strip
Power Supply
, (Pl/Jl) .
, 600PB4592
7.0. WIRE DIAGRAMS
Fixed Disk .Asse~bly
REF'
1
7.1· Plug/Jack L.ocation
CONNECTOR
FROM
TO
Power Supply
P3/J3
Left Drive
Z
Power Supply
Terminal ·Supply
P3/J3
3
4
P6/J6
A4 P5/J5
Powe~ Supply
Harness
Left Drive
Left Drive
5
A4 Pl/Jl
Left Drive
6
TB 1
Located under
Cooling Fan
TB 1
Right Drive
AZP5/J5
Controller PW A
A3PI0/JIO
'.Connector
P3/J3 .,
Controller PW A
A3 Rl/Jl
Right Drive
AZ Pl/Jl
Oistributes AC
Power to:
Fan Assembly
Bl
7
A3 Pl/Jl
Controller PW A
8
9
PI
AJPI0/JI0
Controller PW A
Controller PWA
10
A3 P6/J6
Controller PW A
11
AZ Pl/Jl
Right Drive
Left Drive'
A4 P4
Power Supply
PZ/JZ"
Right Drive
AZ· P4/J4
Top Cover ·Interlock SW
P5 '
Right Drive
A4 Pl/Jl
Left Drive
AZ Pl/Jl
Processor PWA
Power Supply Harness
P3/J3
Right Drive
AZ·P5/J5
Left '. Drive
A4P5/J5.,
Signal Harness:
PI
Controller PWA
A3 Pl/Jl
Left Drive
A4Pl/Jl .
7t- 5
.7.0 WtRE DIAGRAMS
.,
600P84592
.
7.J. PluglJack Location .
REF
Fixed Disk Assembly
CONNECTOR
FROM
12
A2 P5lJ5
Right Drive
13
14
P5/J5
P4/J4
Interlock Switch
Right Drive
15
Al Pl/Jl
Stepper PWA
..
17
A2 P3/J3
Right Drive
A2 P7/J7
Right Drive
18
A2 PS/J8
Right Drive
19
A2 P9/J9
Right Drive
20
A2 P2/J2
Right Drive
21
A3 P2/J2
Co.ntroller PWA
22
J2/P2
Power Supply
Terminal Strip
16
TO
Por er Supply Harness
P3 J3
Controller PW A
A3 PI0/JI0
Left Drive
A4 P5/J5
TB 1
TB 1
Left Drive
P6/J6 .
Right Drive
A2 P9/J9
Fixed Drive
Track Selector Motor
Right Drive
Read/Write Head
Right Drive
Read/Write Head
Stepper PWA
AIPI/JI
Controller PWA
A3 P2/J2
Right Drive
A2 P2/J2
TB 1
600P84592
7.0 WIRE DIAGRAMS
7.1 PluglJack Diagrams
Fixed Disk Assembly
....
15
14'
8
:13'
7.0 WIRE DIAGRAMS
7.2 Plug/Jack Terminal Identification
1
600PB4592
3
2
1o 01
10
1
~8
---......·6
13 12 -II 10' 9
8
7 6
9
0 0 a
000
7
0 0
5 4
a
3
3
1
2, 1
000'0000000000
5
25 24 23 22 21 20 19 18 17 16 15 14
000000000000
19 18 17. 16 15 14 13 12 11 10 9
o
0 00 O'
a a a
8
7
6
3; 36 35 34 33 32 31 30 29. 28 27 2625 24
00000 0 0
a
5
4
3
2
1
0 0 0 0 '00 0 0 0 0 0
zj 22 21 20
0 0 0,0 0'0 0:000
7.0 WIRE DIAGRAMS
7.3 Wire Run Usts
600PB4592'
SYSTEM WITH 5.25" DISC DRIVE ASSEMBLY
(RXO)
51
P1
J1
ACL '~000.:..2_ _,3~
ACN I~ +
" 1.!J..ZSA
GNO
MAIN PWA
MONITOR
PWA
JtSPtS
+ 12VDC
J1 7 r:"
,- 2 -,~,....:...~...;:;..;:;.;...---------------:',
..L '," " SYSTEM G NO
J 7 _P'_7.::G::.:.N;::D~
POWER
SUPPLY
-12VDC
P5 J~
1-"'-';';;;;2-V";:;O·C"'tC-PU-,-)- ' - .
2-;-
S1
ACL. '0'"00-0=-2_ _
ACN
+12VDC(OISK)
:--+t---':O:C~R:E:T~:==:~ ,:
+12 VDC(CRT)
7~
,
...+;..~;;;.V..;.D~C_, _ _~ 82,
: :
I
Li :
-5
GND
" GND
7
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SA1403DInterconnect Diagram
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8.0 TI-EORY OF OPERATION
8.1 General 8.2 DC Power Supply
600P84592
8.3 Processor (CPU) PWR
A. Disc Controller
8.1 General
This device (On the 820-n, it is located on
the Daughter PW A for the floppy or the
fixed) interprets commands from the CPU
and generates appropriate control signals
for the disc drives. It also. interprets status
signals from the disc drives and delIvers
them to the CPU upon request. The second
function is to convert parallel data from the
Data BUBS to serial data suitable for
recording on the disc and also the
conversion· from the serial data read from
the disc to parallel data suitable to the
CPU. The' fixed drive assembly contains a
14030 Controller PWA that in effect tells
the system what type of drives are being
used (SABOO, SA850, or SAI004).
The 820. family is a table top microcomputer composed
of the following assemblies:
820 IP Processor
1. D.C. Power Supply
2. Processor (CPU) PWA.
3. CRT Assembly
.
4. Keyboard ~embly .
820
820
820
820
IP - SA400
IP ':"SA800
IP -SA450
IP - ,SA850
8.4 Disk Drives (5.25")
(5.25" Single Sided F"loppy Drive)
(8" Single Sided F"loppy Drive)
(5.25" Dual Sided F"loppy Drive)
(8" Dual Sided F"ioppy Drive)
820-D Processor1. D.C. Power Supply
2. Processor (CPU) PWA
3. F"loppy Disk Daughter PWA or,
F"ixed Disk Daughter ·PW A·
4. CRT Assembly
5. Keyboard Assembly
B. CRT Controller
The devices that. make up the CRT
Controller provide interface for the display
and CPU.
The CRT Controller w1l1
convert data from· the system data bus into
Horizontal Sync, Vertical Sync and Video
The CRT
signals used by the display.
Controller also handles the task of scrolling
characters up the screen.
820-n IP - SA400 (5.25" 5.5. Dual DensityF"lappy Drive)
820-It IP- SA800 (8" 5.5. Dual DensityF"loppy Drive)
820-II IP- SA450 (5.25"0:5. Dual[)ensity Drive)
820-11 IP- SA850 (8" D.S. DualOensity F"loppy Drive)
820-II IP - 'SAlOOO (10 Me Fixed, ,?rive)
8..2 D. C. Power-Supply
C. Timer Controller
The D. C. Power Supply converts the AC supply
input to thr~e DC :voltagesrequiredby .the system.
These· voltages are . • +5, +12·.. and- 12VDC. Each
voltage has Short circuIt.protection by electro.nic
current limIting. Whe"any'of the outputs are
overloaded the entire" Power: ~Supply wlU shutdown.
The· +5VD:C is· providedwitho~ervoltage protectio~.
8.3 .ProCessOr (CPu)··ptlt
The timer controller's function is to signal
the CPU when a pre-programmed amount of
time has elaQsed. One of the uses of tj"lis
timer is the 30 second delay before turmng
off the 5.25" Disc Drives.
D. Serial Interface Controller
" .
This device 'handles the conversion of the
CPU's parallel data to· serial data required
for serial printers and data communications
equipment (modems), also the conversion of
serial data to parallel data suitable 'for the
CPU. The controller also provides status
information from the external serial device
to the CPU.
Modem control commands
from .. the CPU are generated by this
controller.
The processor (CPU).pWA:·px:~.vldes·lhe.m aster control for
the system.. The Micr.t)processoris ti1e central processing
unit. It· execute8prog~ams (software) .that are stored in
the 64K Ram and the2KROM(820), 6K ROM (820-ll).
The·820 IP incorporates<a· Z80 Microprocessor. where a8
the 820-I1IPincorporates a Z80A. Added features of the
820-n IP processor are:
A.4MHzClwk
B.2-RS232 Ports (onedeqJcated to aerial
printer)
C. 820 System Bus Access
D.Audlble Alarm,
E. Video Highlighting
F. 6K ROM Expan~lonCapacity
G. 2-F"ixed Disc Drive·Options:
SA606 andSA450
SAI004 and SA850
H. Ethernet Connection (via 872/873 Comm
Server)
I. 2-Buffered 8 Bit Parallelports
J. Display Graphic~
The CPU is supported by five .intelligent periphial
controllers.· These.. ·.· ·devices . . handle . ·. . the tasks of
transferring the .. dat-!l-toand from the perlphial
devices, thus relieving th., burden on the CPU.
E. Parallel Interface Controller
This device is· used· as an interfbce between
the CPU and the. parallel keyt-oard. It also
generates· some control signals used as Disc
Drive selects and memory bank selecting.
8.4
DISC DRIVES (5.25")
The left and right disc drives are identical except
for the. placement of Jumpers/resistor networks on
the disc drive PWA's. Each of the F"loppy Disc
Drlveseontains the following.
1.
2.
3.
4.
5.
DC Drive Motor
DC Head Stepper Motor
Read/Wrlte Head
Head Load· Solenoid And Load Pad.
Track -Detector Switch
600P84592
8.5 Disk Drives (8") ,8.6 CRT Assembly
6.
7.
8.
9.
1. Ready (Floppy Disc loaded and at speed)
2. Index (Index hole sensed)
J. Track 00 (Read/Write Head poslt,loned on
Track 0)
4. Write Protect (Write protected disc loaded
in tt:le drive)
Index Led/Detector
Write Protect Switch
Control PCB
Drive Indicator LED
DC Power Is constantly. supplied through. the disc
Interface harness from the power supply ·In the I
processor. The DC drive motor Is turned on when
the appropriate .control signal Is active from the
processor PWA. The disc drives rect ',~e control
signals through' the disc signal hamessfrom the
Floppy Disc Controller on the processor (CPU) PWA.
These controlalgnals select the appropriate disc
drive, control the head stepper motor, the head load
solenoid end select read or write modes.
The . disc drives. send the following status
information through the disc signal hamess to the
Fl0p.py Disc . Controller on the Processor (CPU)
PW'A:
1. Ready (Floppy disc loaded end at speed)
2. Index (Index hole sensed)
3. Track 00 (Read/Write Head positioned on
Track 0)...
'
4. Write protect (Write protected disc loaded
In the drive)
The' function. of the Disc' Drives Is to magnetically
record (write) deta ona floppy disc, and to play
back (read) information that had previously been
sto-ed on a floppy disc.
8.5 DISC
8.0 THEORY OF OPERATION
8.7 Keyboard Assembly
DRIVES (8")
The left end rlghtqlsc Drives are identical except
for. the placement of jumpers on the disc drive
The function of the Disc Drives is to magnetically
record (write) data on a floppy disc,and to play
back (read) information that had previously been
stored on anoppy dllc.
8.6
5.25" AND 8" DUAL SIDED
The SA450 and' SA850 Disc Drives are also used on
the 820 Family. The functions are the same as the
SA400 arid· the SA800 with the exception of a
addltlonalsignal"side>aelect" thus allOWing the Dual
sided 5.2S" drives to have 80 tracks end the dual
sided 8";drlves to have 154 tracks. On the 820-D
Processor, we have double density capability. This is
obtalned,'by the use of MFM (modified frequency
modulation) .and M2FM (modified, modified
frequency'modulation) rather than F'M,' which is the
standard met;hod of' en~oding data on the diskette.
This causes the' write oscUlator frequency. to double.
Data transfer rate Is. also doubled. Thus we now
have dual sided, double density which Is
approximately four "times the capacity of a single
sided, single density.
8.7 CRT ASSEMBLY
PWA.
Each. of the Floppy' Disc Drives·' contains the
following:
The CRT has a 12 Inch screen' with a display
capabllltyof 24 lines of BOcharacters per line. The
Video rate Is l~MHz.
1. AC Drive Motor
2. DC Head 'Stepper Motor
3~ Read/W~lte Head .'.' .... ....<
4. Head Load Solenoid and . LoEldJ'ad
5. 'Track'OOLEO/Detector
,,'
6. 'Index LED/Detector'
7. WrlteProtfict'L~D/petector
8.' Contr0I'PYlA': ,.." .
..
9. Drive'Indlcator'LED
,AC 'poYler'18'torti;tant1>r;~~~~11ed"through '.' the Disc
AC power co.rdto the :dri~e.·motorsfromthe AC
Power Distribution' Pane(when 'th'e,power onswi tch
Is on. .The: disc ro~t~l:maL;s.peedll 360 rpm. The'
drive pUlleysal"ld belts,are ,~I fferent sizes for the
.USn!XC.systeTs~§QIjz:):!~~ 'tJ:te;~: systenls (50 Hz)
,lpJ,?f ~e~.~~. obla!'}, \~n~~;69rp",sP!!led.
:"-<.:.: '. _~;'-:. ;~~~.;:
".::'>:'.-"",>1 ~~!.~ - :,:-,::,;-~.~n~;,: ··:-..:;,.\::J-~;:1;
The Interrilil Supply supplles DC; power (+5VDC, -5
<.- :.,:
',".-'"
{"
VDC,,'+~4'VOCandGND)through~eDisc DC
Harneas_/TheQCpower ,Is used for the logic
clrcultsanddrl~erlrecelver,clr6ultsonthe. PWA's.
The Disc Drives receive<controt'slgnals through the
Disc Signal Harness from th;.Floppy: Disc Controller
on. the Processor CPU PWA ~ 'These control signals
sel~ctt,heapproprlflte Disc Drive, ,control the Head
,'Stepper'Motor, 'the' Heaf:t Load;,SQlenold, ·.and select
<\~~~~i~·~:~J::Y?~;?:~T~~i~~~~·;;':'~J<;::.i~::{:.~i;~~:;i.,· :
:<The.DIscDrlvei)'
,
:, .
~nd:·"the" -;.followlng
. status
\"lrifo'rm·atldii;thf~U9.H:£h!~b~'~~~:~!9~~1;:Harneslto···
.• the
~·~}~fr~,,~,!·;g/~~Z~f.~~{jit~;~c~··~_~~~~
The CRT Assembly contains a complete CRT
monitor requiring only DC Power, horizontal end
vertical Sync. end video inputs.
'./,;, .,.. ':-"
The 820-D haS Business: Graphics made possible by a
4*4 Pixel .Resolution.' It has . two sets Of 128
character sets (lU.S.F:O~, f GRAPHIC FONT),
plus thecapabUitlesfor,2 additional sets. The 820II .also hils. Char~c'ter Blinking and Highlighting. The!
'RX unltsh~veaINTERNATIONALFONT.
8.8 KEYBOARD ASSEMBLY
The,J:<eyboardprovi~es ,.the keyswltchesthat upon
activation generate the appropriate 'ASCII code to
th~ p~~aUel,interface, con~~l!ert~1} .the CPU PWA•
'0.9·
::;' .
' . ,---;>;.,"
. '" ....,.'.: ",,',-' ~';";r'<~;' -<L;~'·.51:-~,:.J:_~~:
14930 DISC DRIVE CONTROLLER
The SA1403q ~ontrol1e' (located .In the. Fixed drive
box" assembly) .consists of a, microprocessor based
controller with on~board data .separator logic and II
able to' control a maximum of four'drives. The
drlvesc8:'"l . be' any combination of Shugart SA1000
flxeddrlvesj,SA8000r SA850 floppy diskdrive.s.
Data'istrarisferred to and from the controller over
a .7. bit with parity bidirectional'. bus ccmnected to
'( t~~Proc~s~qr.,. Th~~<d~ta separator, logic .serializes
.":,,, by"te's and converts to,FM/MFM 'data, to~'send to the
selec,tedDisc DrlveanddeserlallzelFM/MFM data
lnto.>8~bitbY.~I:tC)send;.to:
ttl", ~I)cessor. The~
cammand,andst~tus lnform~tl.on .11 passed between
8.0 THEORY OF OPERATION
8.10
FIXED DISK ASSEMBLY 8.11 CP/M INTRODUCTION
the
processor
and
140.30
controller
on
Unidirectional Signals Busy,Acknowledge, Reset,
Message, Select, Control Data, Request, and
Input/Output.
Shugart SABOO/SAB50disc drives are interfaced via
Jl. Shugart SAIOOO disc' drives are Interfaced via
Jl, JZ, J.3,J4,and J5 with the processor Is
interfaced .via J6. The Processor is interfaced via
J6. Refer to Figure 8-.3 In the Theory Of Operations
in" your service manual for connection block
diagram.
7.
The fixed controller sends the following signals to
the fixed drive:
1.
2.
.3.
4.
8.l0
f1XE() I?ISG.ASSEMBLY
The Fixed DISC AssemblY contains two dis~s,a
power suppl.r, and the flxedcontroUe.r PW A.
The Fixed Controller PWA is the SA
.described ,in" the discacontroller section.
14030
.The Intemal Power Supply,' simllar to the B" disk
. power supply,supplying; DC power (+5 VDC, -5
VDC,+Z4 VDC· andGND)·to·. both'" disks through
the DC hamess•• The DC power is used for logic
circuits, . driver/receiver •circuits, head' write current, and the .• DC· stepper motor control, on. both
disc drives.
The. left.di8c Is a SA B50(Dual Sided,Double
Density) ,floppy·. drive•.•.. This Is the same floppy
cJi-ive as used In the 8" (Dual Sided) disk assembly,
consisting of the same sub-assemblies. The floppy
drive has the same interface as in the B"assembly
except it communicates.with the F='ixed Controller.
and the Fixed Controller then interfaces with the '
.
8Z0 Processor.
Therightdlsc}'isf~',S~ 10d4'~~lskdl-i~~. .This is a
Shugart, Zplatter,' 4 head 10 mega byte fixed
disc
drive. This disl;<.~ivecontainsthe
follO~Ih9{:~;;.':,f;"'/~ . .•. . . •. . . •. . • . .
1.
..'..>~
c
The ,seaied. 2'pi~·tte~4··h~~d~lth stepper
mo~oralrl~'id~~.,tra~dl.lCeras~embly
" 2.' ··,::11le~p,8mPm:,·.-':·::·,:;:~D' ~ .
'.3. ""TheStepperPJIA,. . "',
4. ', ~'Track;;QO . Flag' ~r:nblY.
5.}.O. ~B,:£.Q,.'2gl.?I,~~L,i!:.,. . "M"
"6.. ,'. Ac:ct,rIY'im()~l!I'~it,taC?~pacltor
7~
Motor pulley and belt
. ..'
Theflxed'drive, llke the floppy, Interfaces to the
fixedcontrollerPW,t\~Th~nthe flxedcontroUer
corn.munlcate~'.toth~SPL'.The,"ixeddrivesends
thefollowh1g :.19"81s<£0 'the' fixed controller:
Drive"'sei~Cted'Jdi-i~el~8~lcnowledgement'
to
. ,Dr.ive Selecte~!l~2~ . .3~'·()r 4):,:' , '..'.'
2.,~eady,,(driveo:up,·:tospee~.312~rpm and no
erf()r,;~~I~~IS) :', '" -,~ i ., . '.•••.•.•.. ';,'" ' ,
!.3/ .-IQ"d~~;(~~u9tlYt!Plckup.s!!'nsor>. '., ""-,"
,~'-: ':",~e8' ~C?mpJet~(,,~adposltionedonspeclfled
':;jJ,,~r!l,9~iJ~r'{f.:j{i;')Ji't'~i)'f.;c:(, . .,.. ".. •. :' . . '
":..,~, c·rr8~kOO,<he8ds posltfoned'()" track 00)
'.. 6..-:' J;<Writ~,If.ulf:;(l: Wrlte>cUrrent;~ln ~eadsYlit:"
;':jri':f~~lt nOl~.:Write~; gate Y' from :\\.fb(~d:contr(]llerJ. 2."
1.
"j
~~~~[1;':"~1~~D". ·~'"fi~~f·'li~~~.~·\~f/\~::'";i~;,i;'r~ji;~)c'~··
Drive eelect 1, Z, .3 or 4 (drive select 4 for
fixed, drive select 1 for floppy)
Step. (commands the stepper motor to mO\'e
the read/write heads)
Direction select (defines the direction the
read/write heads will move on a step command)
Head select 0 and head select 1 (selects the
specific head through Iblnary decode)
!!!:.Q
~
!::!!!!!
Off
' Off
Off
On
On
0
On
Off
On
5.
6.
7.
8.
;./ ,..
1
2
.3
Timing Clock (syncronizes data transfer)
Write··· Gate (enables write current to
read/write heada)
IW Switch (changes the amount of current
due to a' need for more current on the outer
tracks of the disk. The switch point is at
track lZ8)
Write Data (MFM)
Through handshaking of the above signals the
drive. performs its function of magnetically
recr,.·rding data" on the fixed platter and to play
beek the information that· had previously been
recorded.
B.l1 CP/M INTRODUCTION
The 82()'processor is designed to accomodate t
r:;P/M(ControLProgram for Microcomputers) dl
operatlngsY8~em.
The. function of snyoperatl
system Is ", to,. manage the hardware r.ourc:
(Keyboard,' .. PrJnter, Display) and provide fl
management capfib!l1tles for the application prograr
intended t~ beexecu~~don ,the system.
CP/MIsI0!;)lcaUydi~ld,~dil'ltofour
AC power Is~b~~t~~'il~"'Su~~ii~iih':~9h.• the '. disk
AC .hal'f,l~lSstr:J,thetdriy.~, l'1'I0t()rfro.m the" AC power
distributioKpaoel~.hefijiu!S"p~we~~Y(I~his on.
,.'"",.~,:,f':~:;:~~i~~j~t;'L'~;~:";,\'i~'·ldr~,,~~:t;'n"/.;,',i..
Read'Data (MFM)
distinct modules:
BIOS (Basic· Inpuf/ooijjGt Sys'tem).
These are t
low level software .' ... drivers for the dlffere
hardware devices connected..o the system. T
13195 .Ia, brought into memTy at boot tll'n~ a
remains 'residijifi!ntU power Is removed. TheBI(
is . used '. by the BOOS. . Typlc8I BIOS functions II!
select disk, set track, set sector read sector, wri
sector,get keyboard input, and print character
printer.' TheBIO,?ls usually different on other typ
of CP/M compatable computers, because tl
mechanisms to select discs, print characters et
may 'be "different•.' The BIOS occupiel 512 B.ytes
me",ory~'
. -
. Be>b~(~aSlc:Qi~'c'Operat1"g·Sy•.tem). Like the BIC
.theBDOSlsread~cfrorn,~iscJntq, memory lit bo
time. and-remafns'ieaident until poweri. remove
~ppUcatlon' ."Programs.· (word •processing,. bSI
, .'~,~ ..,Int~r.p'r~~;~.~ i~£4,,!r,at!'t~~c"';~J,~,t,t,le,BDOS tq utili
the'~' tiardware, r",ource..at~ched·'to the ,Iyate
. (printf:ha~8cterI1'dilpl.Y~har8'cters, open dif< file
close,di~C?,JU.r;" etci~).;,.,Tht!~DOS in turn.lntJIr~8c
,600P84592
8.0 THEORY OF OPERAT10N
with the BIOS to accomplish the desired task. The
BOOS occupies '456 Bytes of memory.
CCP (Console Command Processor).
The CCP
allows the user to view the disc directory, erase
f11es and rename fUes. The CCP can be overlaid by
applications programs. The ·c~r is used to get the
applications program off of the disk into memory to
. be executed, at this point the CCP .ls no longer
needed as all operating system interface is through
BOOS. The CCP occupies 1920 Bytes of memory.
TPA (Transient Program Area). This is the area in
memory that applications programs are executed
from.
The CP/M operating system prOVides excellent
transportability of software from system to system
regardless of the hardware configuration.
NOTE: CP/M is a trademark of Digital Research Inc.
8-7
600P84592
. SCHEMATIC.
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600P84592
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1.8.0 lJ-E0RY OF OPERAllOr"
600P~459Z
Processor Block Diagram 820/820-0
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111·111
BUSINESS REPLY MAll
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Postage will be· paid· by:
XeroJfCorporation"
XEROX CORPORATION
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ATTtii··I\IIANAGE"rfi=IELDENGI'NEERING
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Page No.lFI",. No.
Job Title
Oat. and Revi.ion
of Publication
Date
Employ•• No.
Title of Publication
Oncription of Error or Deficiency (pie... be specific)
location Code