Download DR128+Service+Manual..

ALLEN&HEATH
WARNING – HIGH VOLTAGES
Power Supply Unit (PSU) work should only
be carried out by qualified personnel.
We recommend that you use an approved Allen & Heath
service centre for all power supply work.
Please contact your local Allen & Heath distributor for more details.
http://www.allen-heath.com/
DR
128
12 IN 8 OUT
24-BIT DIGITAL
MIX PROCESSOR
SERVICE
MANUAL
PUBLICATION
AP2974
HOW TO USE THIS MANUAL
This service manual is published in two sections:
Section A:
contains the INSTALLATION / USER GUIDE which includes
details of INSTALLATION, CALIBRATION and
OPERATION for the DR 128.
Section B:
contains the SERVICE INFORMATION which includes
details of SERVICE PROCEDURES, SPARE PARTS &
ASSEMBLIES and CIRCUIT BOARD DIAGRAMS for the
DR 128.
copyright © 1997 ALLEN & HEATH. All rights reserved
DR128 SERVICE MANUAL
Publication ..................... AP2974 Issue 1
SECTION A
A
DR 128 INSTALLATION / USER GUIDE
CAUTION
Refer all installation, calibration and service work
to qualified service personnel
DR128 SERVICE MANUAL
Limited One Year Warranty
! "
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$ ! ! % &
Conditions of Warranty
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Contents i
Full Contents
Section 1 - Introduction
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Section 2 - DR128 Overview
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Section 3 - Using the DR128
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Section 4 - Hardware Configuration
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Section 5 - Setup Menu
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DR128 USER GUIDE
Introduction 1
Introduction
1
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DR128 USER GUIDE
2 Introduction
Introduction
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Service & Technical Support
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To avoid damage to internal components by mishandling and/or
misconnection, only technically competent personnel should
attempt service & installation work on this unit.
1 5 . 5 .12 /..
WARNING TO THE USER, INSTALLATION, SERVICE ENGINEER
Allen & Heath warns that any unauthorised changes or
modifications to the DR128 unit may invalidate the legal
compliance of the unit and could void the user's authority to
operate the equipment.
DR128 USER GUIDE
Introduction 3
SAFETY WARNING
Mains electricity is dangerous and can kill. Mains voltage is
present within the DR128. Do not remove the top cover with the
mains connected. Do not carry out any work within the unit while it
is powered except for installation calibration. High voltage
components are insulated for safety but should not be touched
with power applied. The mains voltage setting is indicated on the
rear panel mains socket. Check that this matches your local mains
supply voltage. Check your mains wiring and earthing before
switching on.
DO NOT REMOVE THE MAINS EARTH CONNECTION
To ensure your safety the mains earth is connected to the chassis
through the power lead. Do not remove this connection.
Precautions
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DR128 USER GUIDE
4 Introduction
Installation
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Precaution
To avoid damage to the internal assemblies do not fit screws through
the sides or underside of the unit. Secure to external brackets or fittings
through the front panel rack mounting holes.
DR128 USER GUIDE
Introduction 5
Connecting Mains Power
( 6 4
5 ..
5
. ..&1
( . 1 & & . 51 Changing the Fuse or Mains Voltage Setting
.1 .
.
9.. 7 6 . :
Ac mains
Fuse
100V AC
T1.6A
120V AC
T1.6A
220V AC
T630mA
230V AC
T630mA
. . . . (..+51
.7 . DR128 USER GUIDE
6 Introduction
Connecting DC Supplies
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Remove all power to the DR128 when replacing the fuse
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DR128 USER GUIDE
Introduction 7
Earthing
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DR128 USER GUIDE
8 Introduction
DR128 USER GUIDE
DR128 Overview 9
DR128 Overview
2
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DR128 USER GUIDE
10 DR128 Overview
Introduction
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DR128 USER GUIDE
DR128 Overview 11
Basic Principles
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DR128 USER GUIDE
12 DR128 Overview
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DR128 Configuration
Resource Palettes
Basic DR128
1
Basic DR128 + one DSPx Expander card
3
Basic DR128 + two DSPx Expander cards
5
240:4;"
45
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00
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DR128 USER GUIDE
DR128 Overview 13
DR128 USER GUIDE
14 DR128 Overview
Front Panel
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Control Keys /0 * ' /0
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Rack Ears
/0* 4*
DR128 USER GUIDE
DR128 Overview 15
DR128 USER GUIDE
16 DR128 Overview
Rear Panel
1
Battery Input
I4@"! /05
4".0454
2
Sys-Net Option
/0443
3
RS-232
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2 <+5 <+5 %+5 4 J++F 64!
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Mic/Line Inputs
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Line Inputs
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Line Outputs
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4+@?G DR128 USER GUIDE
Using the DR128 17
Using the DR128
3
Contents
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DR128 USER GUIDE
18 Using the DR128
Front Panel Display
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DR128 Ver 1.00
Please Wait
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Wednesday 11:59
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# + # % *8 1 %1 3+ DR128 USER GUIDE
Using the DR128 19
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DR128 USER GUIDE
20 Using the DR128
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Mic 1
Lev 65
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DR128 USER GUIDE
Using the DR128 21
dB
dB
100
95
90
85
80
75
70
65
60
55
50
0
-1
-2
-3
-4
-5
-6
-7
-9
-11
-13
45
40
35
30
25
20
15
10
5
0
-15
-18
-21
-25
-30
-35
-40
-50
-60
OFF
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DR128 USER GUIDE
22 Using the DR128
Mic 1
Lev 35
@ %%% - $4
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Mic 1
Lev 75
@%(%%
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'- &
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Green
on at -36 dBFS
Red
on at -6 dBFS
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DR128 USER GUIDE
Using the DR128 23
Patch Recall
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Loaded !
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Remote Switches
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Wiring Remote Switches
,+&-
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Pin 1 - Switch 1 Input
Pin 2 - Switch 2 Input
Pin 3 - Switch 3 Input
Pin 5
Pin 4 - Switch 4 Input
Pin 1
Pin 5 - Switch 5 Input
Pin 9
Pin 6 - Switch 6 Input
Pin 6
Pin 7 - Switch 7 Input
Pin 8 - Switch 8 Input
Pin 9 - Common
DR128 USER GUIDE
24 Using the DR128
.
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Level
Up
Pin 1 - Switch Input 1
Pin 2 - Switch Input 2
Down
Pin 9 - Common
,
1
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1 %
-
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Level Up
Level Down
Pin 1 - Switch Input 1
Pin 2 - Switch Input 2
Pin 3 - Switch Input 3
Pin 4 - Switch Input 4
Pin 9 - Common
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33!
3!
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Level
Pin 1 - Switch Input 1
Pin 2 - Switch Input 2
Pin 9 - Common
DR128 USER GUIDE
Level
Up
Up
Down
Down
Hardware Configuration 25
Hardware Configuration
4
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DR128 USER GUIDE
26 Hardware Configuration
%&&&'
Setting
Adjustment Made
Factory Setting
Notes
Mic Input Gain
On rear panel
Gain minimum
Fully anti-clockwise
Mic/Line Pad
Links on Mic In PCB
Pad not enabled
Links fitted
Mic Phantom Power
Links on Mic In PCB
Phantom Power On
Links fitted
Line In Sensitivity
Internal trimmer on
Line Out PCB
-10dBV sensitivity
Trimmer fully
clockwise
Output Sensitivity
Internal trimmer on
Line Out PCB
+4dBu sensitivity
Trimmer fully anticlockwise
&()$*+
,
,*
Signal Levels
-&
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/&2(
Green
on at -36 dBFS
Red
on at -6 dBFS
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60/.&*7!
,
DR128 USER GUIDE
Hardware Configuration 27
Mic/Line Inputs
Pin 2 = +
+
2
31
1
3-Pin XLR Male Plug
5
.&!8$9:!
,/51,;)
Phantom
Power
+15V PP
2
+
1
-
3
24-Bit ADC
22dB Pad
Mic Gain
Trim
6 7! & <7! !
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,*&.
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Setting Mic/Line Input Gain
2&;)
&6?&
& ,* ..6&*
6
,&&&
!<.
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Anti-Clockwise
Mid
Clockwise
Mic Gain (dB)
18
35
60
Line Gain (dB)
-4
13
38
DR128 USER GUIDE
28 Hardware Configuration
Selecting Mic Pad
6&()$&*&6
. & )
.!&
)
. 6 %!6&,'
1
2
3
4
5
6
7
8
Pad
Disabled
Precaution
Make sure that the Phantom Power is disconnected when using the
Mic/Line inputs with Line level sources.
Phantom Power
6 ()$@ &* & "A68$9:
&B#&;).
&&& * 2 ,
A / * *
,
2.,,6,
? . )
.6%!6&
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DR128 USER GUIDE
Pad
Enabled
Hardware Configuration 29
1
2
3
4
5
6
8
7
Phantom
Power
ON
Phantom
Power
OFF
Line Inputs
4,
)%0*
A
+
B
A-B Mono
Sum
24-Bit ADC
Mic Gain
Trim
%( *1 6 )
1 ,
2 & 7 1
0B!1,4
, 6 /
,,6,/
Setting Line Input Gain
2 & 7 $!
6 * , ? , /$3!:&
87!6()$
&*&&/$3!:,&
& %( *1 6 1 )
C
1 + , ,*
87!
6,,
, ,* ,
DR128 USER GUIDE
30 Hardware Configuration
1
2
3
4
6
*&*
%!1&
*/.(5
&
Caution
Do not attempt to force the gain trimmers as they can easily be
damaged.
6 * &* /$3!: < 5* /!1 5 =
6
*
,&&&
Sensitivity (dBu)
Gain (dB)
DR128 USER GUIDE
Anti-Clockwise
Mid
Clockwise
+4
-4
-8
0
+8
+12
Hardware Configuration 31
Balanced Outputs
6 , #/ ;) 6
,
+
2
-
3
1
20-Bit DAC
Line Out
Gain Trim
Setting Output Gain
2&,$!
6 * , ? , /$3!:
B&
87!
6()$
&*&&87!
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C
1 + + 1 5 1 , ,* /$3!:
6,,
, ,* ,
1
2
3
4
5
6
7
8
DR128 USER GUIDE
32 Hardware Configuration
6
*&*
%! & *.(5
&
Caution
Do not attempt to force the gain trimmers as they can easily be
damaged.
6
*&*87!6
*
,
&&&
Sensitivity (dBu)
Gain (dB)
DR128 USER GUIDE
Anti-Clockwise
Mid
Clockwise
+4
-4
-8
0
+8
+12
Setup Menu 33
Setup Menu
5
!""
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34 Setup Menu
Introduction
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Entering Setup Mode
SETUP
27"/0$
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Entering the Security Password
*** Setup ***
PASSWORD:“????”
SET
9-"072%
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2
0*',"""0""%"
%
*** Setup ***
Password Wrong!
00%""3"
*** Setup ***
*1 Recall Patch
DR128 USER GUIDE
Setup Menu 35
Navigating the Menus
9-0*',
%
ESC
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%2
SET
1-%"
2;'-0%"
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Exiting Setup Mode
2'-
0%3
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Exit Setup
SAVE CHANGES: Y
SET
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0
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Save setup, exit
PATCH: 1 ON
SET
9 - " 2 " %3 "" 3
(3
2
Save setup, exit
SAVING PATCH 1
0"(%""%
"""",!$&00
2""3
"
DR128 USER GUIDE
36 Setup Menu
Menu Map
Main Menu
Items
Menu Settings
19
Set Security
[Password]
[On/ Off]
18
New
Password
[Current
Password ]
[New Password]
17
LCD Contrast
Contrast
[0..10]
16
Clock
Time
[HH:MM:SS]
15
Day of Week
[Day]
14
Remote Keys
Key Number
[1..8]
13
Soft Keys
Key Number
[1..12]
Function
- Unused
- Level Control
- Patch Change
Param 1
Param 2
Param 3
Channel
Patch No.
Min Trim
Max Trim
Function
- Unused
- Level Change
- Patch Change
- Patch Select
Param 1
Param 2
Param 3
Channel
Patch No.
Min Trim
Max Trim
Level
[0..100]
12
Matrix
I/P Channel
[1..12]
O/P Channel
[1..8]
11
O/P Level
O/P Channel
[1..8]
Level
[0..100]
10
I/P Level
I/P Channel
[1..12]
Level
[0..100]
9
O/P Phase
O/P Channel
[1..8]
Phase
[NORM/REV]
8
I/P Phase
I/P Channel
[1..12]
Phase
[NORM/REV]
7
Ducker
I/P Channel
[1..12]
6
Limiter
O/P Channel
[1..8]
5
Name Output
[Output Name]
4
Name Input
[Input Name]
3
Name Patch
[Patch Name]
2
Save Patch
[Patch Number]
1
Recall Patch
[Patch Number]
DR128 USER GUIDE
[OFF/ACTIVE]
Priority
[1..3]
Threshold
[-1dB..-30dBFS]
Threshold
[0dB..-60dB]
Response
[Slow, Med, Fast]
Depth
[1dB..60dB]
Release
[1db/s.. 100dB/s]
O/P 1..8
[On/Off]
Setup Menu 37
1 - Recall Patch
2%%""0
*** Setup ***
*1 Recall Patch
2 " SET
"%37
0%
*1 Recall Patch
PATCH: 1
*1 Recall Patch
PATCH: 2 ON
SET
(""30
"
2""
*1 Recall Patch
LOADING PATCH 2
*1 Recall Patch
PATCH 2 LOADED!
*** Setup ***
*1 Recall Patch
2 - Save Patch
2 % % ,!$& 0 *** Setup ***
*2 Save Patch
2 " SET
"%37
0%
*2 Save Patch
PATCH: 1
*2 Save Patch
PATCH: 2 ON
SET
(""30
"
2
2""-0
DR128 USER GUIDE
38 Setup Menu
*2 Save Patch
S A V I N G PATCH 2
*2 Save Patch
PATCH 2 SAVED!
*** Setup ***
*2 Save Patch
3 - Name Patch
2%%0%&
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2 % %3 " " 0 *',
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20"%=+47=+$4
*** Setup ***
*3 Name Patch
2 " SET
*3 Name Patch
PATCH: 1
"%37
0%
*3 Name Patch
PATCH: 2 ON
(""30
2
%
* 3 Name Patch 2
NAME: “Patch 02”
SET
SET
9-""72%
<'%
1""
2
4 - Name Input Channel
2 % % 0 $ '" % &
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00-3"'"
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2 % " " " 1,!
2
0""%=47=$47=*)4
DR128 USER GUIDE
Setup Menu 39
*** Setup ***
*4 Name Input
2 " '"
SET
*4 Name Input
I/P CHANNEL: 1
SET
* 4 Name Input 1
NAME: “Mic 1 ”
SET
"
'"%37
0%$
2
%
9-""72%
<'%
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2
5 - Name Output Channel
2 % % 0 & ( '" % &
"
0 0 - 3 " (
'" ""7 ( '" % " " 0 *',
>""
2%"""1,!
2
0""%=(;47=(;$4
*** Setup ***
*5 Name Output
2 " ('"
SET
*5 Name Output
O/P CHANNEL: 1
SET
*5 Name Output 1
NAME: “O/P 1 ”
SET
"(
'"%37
0%&
2
%
9-""72%
<'%
1""
2
DR128 USER GUIDE
40 Setup Menu
6 - Limiter Setup
*% 7 0 (
'"
2" ! " " "0%0"%
Threshold
2"%%"""%
2""?.
2"3"0%6
0dB
-1dB
-2dB
-3dB
-5dB
-7dB
-10dB
-12dB
-15dB
-20dB
-25dB
-30dB
-35dB
12"+?*%3"8""00
Response
2*%!%%0*%""
""3*%2"0"%"""
""0""3""
Attack
Release
100uS
300uS
1mS
3mS
1mS
3mS
10mS
300uS
*** Setup ***
*6 Limiter
*6 Limiter
O/P CHANNEL: 1
*6 Limiter O/P 1
ACTIVE: O F F
*6 Limiter O/P 1
THRESHOLD: 0dB
DR128 USER GUIDE
10mS
30mS
30mS
100mS
100mS
300mS
300mS
1S
1S
3S
2"
('"
SET
SET
SET
SET
9-
"
('"
22
9-
"*%
(;(..
2
2
9-
"2"
""
2
2
Setup Menu 41
*6 Limiter O/P 1
ATTACK: 100uS
*6 Limiter O/P 1
RELEASE: 300uS
SET
SET
9-
"52%
2
2
9-
"!"
2%
2
2
7 - Ducker Setup
5 "" ,- 0 "
2 ,- ""
'" "" " ( '" " 2 "" " 072"7,!";@"
Ducker Priority
."'"""3-
,-
30
$
%%%
%%%
5-"7
Ducker Threshold
2,-2"%"":
22""?.
2"3"
0%+? +??
Ducker Depth
2,-,%%%0""
,-""
A"
?
.%"7,0 ?""""003
? ,- 2 , 3 " 0% +? +? 0?
Ducker Release
2 ,- !" % % - " "" %" "" 0 "" 3" 2"
A" ? 0% ? B""C++?B0"C0?
DR128 USER GUIDE
42 Setup Menu
Ducker Output
. 7 " " 3 00 3 ,-
*** Setup ***
*7 Ducker
2"
'"
SET
*7 Ducker
I/P CHANNEL: 1
SET
9-
"
'"
,-
2
2
9-3"
3",-
*7 Ducker I/P 1
DUCKER: OFF
",-5'2A0%
,-(..
05;?-83" 0,-(..0%%
3"
*7 Ducker I/P 1
DUCKER: ACTIVE
*7 Ducker I/P 1
PRIORITY: 1 Max
*7 Ducker I/P 1
THRESHOLD: 0dB
*7 Ducker I/P 1
DEPTH: -1dB
*7 Ducker I/P 1
RELEASE: 1dB/s
DR128 USER GUIDE
2,-
8,-%
SET
SET
SET
9-
"
2
9-
",-
2"
2
9-
",-
,2
SET
SET
9-
",-
!"
2
Setup Menu 43
*7 Ducker I/P 1
DUCK O/P 1: YES
SET
*7 Ducker I/P 1
DUCK O/P 8: NO
SET
9-
,-((..
('"
2"(
'"$&
8 - Input Phase
2 % % " 0 '"
2
0"0%"B C
*** Setup ***
*8 I/P Phase
2"
'"
SET
*8 I/P Phase
I/P CHANNEL: 1
SET
*8 I/P 1 Phase
PHASE: NORMAL
SET
9-
"
'"
2
9-"(!5*B C!A!BC
2%%
9 - Output Phase
2%%"0('"
2
0"0%"B C
*** Setup ***
*9 O/P Phase
*9 O/P Phase
O/P CHANNEL: 1
2"
('"
SET
SET
9-
"(
'"
2
DR128 USER GUIDE
44 Setup Menu
*9 O/P 1 Phase
PHASE: NORMAL
SET
9-"(!5*B C!A!BC
2%%
10 - Input Level
9%%"'"*"
2:"%
0 1 1,!
2 "" 3 0%+++0
23"3""""?
dB
dB
100
95
90
85
80
75
70
65
60
55
50
0
-1
-2
-3
-4
-5
-6
-7
-9
-11
-13
45
40
35
30
25
20
15
10
5
0
-15
-18
-21
-25
-30
-35
-40
-50
-60
OFF
*** Setup ***
*10 I/P Level
*10 I/P Level
I/P CHANNEL: 1
*10 I/P 1 Level
LEVEL: 100
DR128 USER GUIDE
2"
'"
SET
SET
SET
9-
"
'"
2
9-
""0%
+++
2
2
Setup Menu 45
11 - Output Level
9%%"('"*"
2:"%
0(11,!
2""3
0%+++0
23"3""""?
dB
dB
100
95
90
85
80
75
70
65
60
55
50
0
-1
-2
-3
-4
-5
-6
-7
-9
-11
-13
45
40
35
30
25
20
15
10
5
0
-15
-18
-21
-25
-30
-35
-40
-50
-60
OFF
2"
('"
*** Setup ***
*11 O/P Level
SET
*11 O/P Level
O/P CHANNEL: 1
9-
"(
'"
2
SET
*11 O/P 1 Level
LEVEL: 100
9-
""0%
+++
2
2
SET
12 - Crosspoint Matrix Levels
2""0$&' 3>
%%
2""30%+++0
23"3"
"""?
dB
dB
100
95
90
85
80
75
70
65
60
55
50
0
-1
-2
-3
-4
-5
-6
-7
-9
-11
-13
45
40
35
30
25
20
15
10
5
0
-15
-18
-21
-25
-30
-35
-40
-50
-60
OFF
DR128 USER GUIDE
46 Setup Menu
2"
'"
*** Setup ***
*12 Matrix
SET
*12 Matrix
I/P CHANNEL: 1
SET
*12 Matrix IP 1
O/P CHANNEL: 1
SET
*12 I/P 1 O/P 1
LEVEL: 100
SET
9-
"
'"
2
9-
"(
'"
2
9-
""0%
+++
2
2
13 - Function Key Setup
0 $ . " . / 3 %% 0 0""0
9
*"
(*"
"
!""
*"9
*",
(*"9 (*",
,00%%70"
*** Setup ***
*13 Soft Keys
*13 Soft Keys
KEY NUMBER: 1
2"
./%3
SET
SET
9-
".
/2
2%%"./4>3
23:%
%""0"
*13 Key 1 Func.
Fn: UNUSED
DR128 USER GUIDE
SET
9-
".
/2
Setup Menu 47
Function Key - Unused
0./99,7/%"%""
"=943%"0*',
Function Key - Level Control
20""%%./;*"7;
*"97;*",7(;*"7(;*"9(;*",
0./;*"(;*"7%"
""""3./-"
""
0./;*"97;*",7(;*"97
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"""
""7./"""2%*%3
2%%%8%%%""3>.
/
,0""02%"%+B%%%C++B%%%C
2%"3"0;*""
*13 Key 1 Func.
Fn: I/P Level
*13 Level Key 1
I/P Channel: 1
*13 Level Key 1
MIN LEVEL: 0
*13 Level Key 1
MAX LEVEL: 100
SET
SET
SET
SET
9-
";*"
0
2
9-
";'"
*""
2
9-
"%%
2%*%0%+
++2
9-
"%%
2%*%0%+
++2
Function Key - Patch Select
0./"%"
""03./-
"%372""
DR128 USER GUIDE
48 Setup Menu
Function Key - Patch Recall
0./!""7%"%"
./""""%3"
*13 Key 1 Func.
PATCH: 1
SET
9-
"
%3""
2
14 - Remote Key Setup
2,!$&4!") , 20%
" 2 3 0 %"0."./
0&!%/
3%%00""0
9
!""
*"9
*",
(*"9
(*",
,00%%70"
*** Setup ***
*14 Remote Keys
*14 Remote Keys
KEY NUMBER: 1
2"
!%/%3
SET
SET
9-
"!%
/2
2%%"!%/4>3
23:%
%""0"
Remote Key - Unused
*14 Key 1 Func.
Fn: UNUSED
DR128 USER GUIDE
SET
9-
"!%
/2
Setup Menu 49
Remote Key - Level Control
20""%%!%/;*"97
;*",7(;*"97(;*",
0!%/;*"97;*",7(;*"97
(;*",7%"!%/""%
%"""
""7!%/"""72%*%3
2 %%% %%% "" 3 > !%
/
,0""02%"%+B%%%C++B%%%C
2%"3"0;*"9"
*14 Key 1 Func.
Fn: I/P LEVEL
*14 Key 1 Func.
I/P Channel: 1
*14 Level Key 1
MAX LEVEL: 100
SET
SET
SET
9-
"!%
/40
2
9-
";'"
*""
2
9-
"%%
2%*%0%+
++2
0;"",73%"0%%2%
"%
*14 Level Key 1
MIN LEVEL: 0
SET
9-
"%%
2%*%0%+
++2
Remote Key - Patch Recall
0 !% / !""7 %" %"
!%/""""%3"
*14 Key 1 Func.
PATCH: 1
SET
9-
"
%3""
2
DR128 USER GUIDE
50 Setup Menu
15 - Day of the Week
9 % % , 0 1- 0 " "-
%"
8%"3%"0*',
2%
0-"0%%%
*** Setup ***
*15 Day of Week
2,
01SET
*15 Day of Week
DAY: SATURDAY
SET
9-
",
2
16 - Clock
9%%%0"'"-
%"
8%"3%"0*',
2%0
-"0%%%
*** Setup ***
*16 Clock
2
'"-2%
SET
*16 Clock
TIME: 18:43:31
SET
9-"@22%
7%7"
17 - LCD Contrast
9 % > *', 0 00 %3 " "
A"3+B"C+B-C
20""
*** Setup ***
*17 LCD Contrast
*17 LCD Contrast
CONTRAST: 3
DR128 USER GUIDE
2*',
'
SET
SET
9-
>
2
Setup Menu 51
18 - New Password
9 % % % 2 0 0 ( B
% % ) C
2 0" =DDDD4 (..
*** Setup ***
*18 New Password
2
SET
00(..""3
%
*18 Enter P’word
CURRENT: “ ????”
SET
9-"0 "
""
92%'%
<""3%
*18 Enter P’word
NEW: “ ????”
SET
19 - Security
2%%0((..
"%E
%%
0430=DDDD4
03"" *** Setup ***
*19 Set Security
*19 Set Security
PASSWORD:“????”
2
SET
SET
DR128 USER GUIDE
52 Setup Menu
9-"0
92%
*19 Set Security
SECURITY: ON
SET
9-0%((..
Forgotten Password?
DR128 USER GUIDE
Appendix 53
Appendix
6
DR128 USER GUIDE
54 Appendix
Architect’s Specification
The unit shall be a digital mix processor with 12 analogue inputs and 8 analogue outputs.
The unit shall have a full crosspoint matrix, comprising 96 points, allowing any input, or
combination of inputs, to be routed to any output or combination of outputs. All
crosspoints shall have a variable level. The 8 mic/line inputs and 8 line level outputs
shall be on balanced XLRs with level trims. The 4 stereo line inputs shall sum to mono
and be on RCA phono connectors with level trims. Comprehensive ducking capability
shall be provided.
The mic/line inputs shall have internal jumpers for pad and phantom power selection.
The mic/line gain range shall be 18dB to 60dB with input impedance of 2k (no pad) or
10k (pad). The phono input gain sensitivity shall be internally adjustable from -10dBv
to +4dBu with an impedance of 10k. The inputs shall be converted using a 24 bit
analogue-to-digital converter.
The XLR outputs shall have a variable senitivity from -10dBV to +4dBu with an output
impedance of 50. The conversion shall be by a 20 bit digital-to-analogue converter.
The unit shall be configured over a standard RS232 port using a proprietary 32-bit
Windows™ based software application with a Graphical User Interface. Configurations
shall be editable both on and off-line. The configuration shall determine the allocation of
internal signal processing resources to input and output channels, as well as routing,
passwords, levels and channel names. After configuration, the unit shall run standalone,
without an external computer. Signal processing resources available shall include
compressors, gates, limiters, graphic equalisers, parametric equalisers and crossovers.
Optional expander cards shall provide the facility for additional signal processing
resources and/or supplementary delay resources. The unit shall use Flash memory to
permit firmware upgrades via the RS232 port. An internal real-time clock shall allow
scheduling of timed events.
The unit shall be compatible with BS5839 installation requirements. The hybrid
switched/linear power supply shall allow emergency operation with a single 24V external
battery and the unit shall interface with alarm systems. The total power consumption
shall be no more than 70VA and the permissible incoming mains voltage range shall be
configurable to 100, 120, 220 or 230 VAC.
The front panel shall feature 12 installer-definable function keys for user control of
volume levels and patches. A removable fascia shall enable custom labeling. There shall
also be a backlit LCD for indication of setup menus, peak conditions, patch status and
channel levels. Important system parameters, such as Patch Naming, Channel Naming,
Limiter control, Ducking control, Phase reversal, Routing assignments, Date/Time, LCD
contrast and Soft Key definitions shall be password-protected from user adjustment.
Facilities for remote switching of unit parameters shall be provided.
The unit shall weigh no more than 10kg in a 2U rack-mount chassis. The chassis shall be
constructed from zintec steel and feature a removable top for configuration of internal
jumpers and presets.
The unit shall be the Allen & Heath DR128 digital mix processor.
DR128 USER GUIDE
Appendix 55
Technical Specifications
Headroom
+16dBu (+4dBu nominal operating level)
Max Output
+16dBu
Frequency Response
20Hz - 20kHz +/-1dB (+4dBu into 600 ohms)
THD
0.005% @ 1kHz typical
Dynamic Range
99 dB typical (Mic Input to Line Output)
Hum & Noise
<-80dB measured rms 22Hz to 22kHz bandwidth
Mic EIN
-127dB (150 Ohm source)
Crosstalk @1kHz
>80dB Adjacent Input Channels
Sampling Frequency
48kHz
A/D Converter
24-bit Sigma-Delta 128-times oversampling
D/A Converter
20-bit Sigma-Delta 128-times oversampling
Processing
24-bit linear
Mic Input Gain Control
external 42dB (60dB to 18dB) variable
Mic/Line Pad
22dB internal link
Line Input Gain Control
internal 12dB (-8dBu to +4dBu) variable
Line Output Gain Control
internal 12dB (-8dBu to +4dBu) variable
LCD Display
2 x 16 Character, backlit
LED indicators
Tri-colour Programmable
Signal levels
Green
Red
On at –36dBFS
On at –6dBFS
Function Keys
12 Programmable as Unused, Level controls or Patch changes
Front Panel Meters
12 Programmable as Signal Meters or Status Indicators
RS232
9 way female D-Type, unbalanced 57.6 kBaud
Remote Switch Inputs
9 way female D-Type, 8 opto-isolated, programmable
Patch Memories
16 internal
Battery Operation
+24V DC +/-15% @ 3.5 Amps maximum
Mains Settings
100 VAC
120 VAC
220 VAC
230 VAC
Power Consumption
70 VA maximum
Weight
Packed
Dimensions
482 x 380 x 89mm (rack mounting brackets fitted)
Options
DSPx DSP Expander
DSPd Delay Expander
Fuse: T1.6A
Fuse: T1.6A
Fuse: T630mA
Fuse: T630mA
10 kg
Unpacked
9.5 kg
DR128 USER GUIDE
56 Appendix
Connecting WinDR
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DO NOT INSTALL THIS SOFTWARE OVER A PREVIOUS VERSION.
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DR128 USER GUIDE
Appendix 57
:
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7
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Finish
IMPORTANT
Before running the WinDR application you MUST update the
DR128/DR66's System Software to the same version using the
'DR128 System Update'/'DR66 System Update' utility. Run the 'Code
Update Procedure' Help file in the WinDR program group for
information on how to do this.
DR128 USER GUIDE
58 Appendix
Installing WinDR from the internet.
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DR128 USER GUIDE
Appendix 59
4 7
/
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IMPORTANT
Before running the WinDR application you MUST update the
DR128/DR66's System Software to the same version using the
'DR128 System Update'/'DR66 System Update' utility. Run the 'Code
Update Procedure' Help file in the WinDR program group for
information on how to do this.
Connecting the to a remote PC.
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DR128 RS232
Signal
9way D type
Pin 2
Tx
Pin 3
Rx
Pin 5
0V Ground
Pins 1, 4, 6, 7, 8, 9 = not connected
Connector chassis connected to chassis earth
DR128 USER GUIDE
60 Appendix
Reseting the Password
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DR128 USER GUIDE
Normal
Operation
1
SECTION B
B
DR 128 SERVICE INFORMATION
CAUTION
Refer all installation, calibration and service
work to qualified service personnel
Warning to the Service Engineer
Allen & Heath warns that any unauthorised changes or
modifications to the DR 128 unit may invalidate the legal
compliance of the unit and could void the user's authority to
operate the equipment.
DR128 SERVICE MANUAL
2 Section B
CONTENTS
INTRODUCTION, SERVICE AND TECHNICAL SUPPORT ..................................................... 3
REMOVING A CONNECTOR CIRCUIT BOARD ASSEMBLY (upper & lower) ........................ 4
REMOVING THE MICROPROCESSOR (CPU) CIRCUIT BOARD ASSEMBLY ...................... 5
REMOVING THE FRONT PANEL CIRCUIT BOARD ASSEMBLY (inc LCD display) ............... 6
REMOVING THE POWER SUPPLY CIRCUIT BOARD ASSEMBLY ....................................... 7
ORDERING A DR128 UNIT, OPTIONS & SPARE ASSEMBLIES ............................................ 8
ORDERING SPARE PARTS .................................................................................................... 9 - 10
TRANSFORMER & POWER WIRING ...................................................................................... 11
PSU CIRCUIT BOARD COMPONENT IDENT ......................................................................... AG2605
PSU CIRCUIT DIAGRAM sheet 1 of 2 (transformer & battery changover) .............................. C2605
PSU CIRCUIT DIAGRAM sheet 2 of 2 (switching & linear regulators) ..................................... C2605
MIC INPUT CONNECTOR CIRCUIT BOARD COMPONENT IDENT ...................................... AG2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 2 of 8 (mic inputs 1 & 2) ..................... C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 3 of 8 (ADCs 1 & 2) ............................ C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 4 of 8 (mic inputs 3 & 4) ..................... C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 5 of 8 (mic inputs 5 & 6) ..................... C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 6 of 8 (mic inputs 7 & 8) ..................... C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 7 of 8 (ADCs 3 & 4) ............................ C2602
MIC INPUT CONNECTOR CIRCUIT DIAGRAM sheet 8 of 8 (Connectors) ............................ C2602
LINE OUTPUT CONNECTOR CIRCUIT BOARD COMPONENT IDENT ................................. AG2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 2 of 8 (line inputs 1 & 2) ................. C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 3 of 8 (line inputs 3 & 4) ................. C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 4 of 8 (balanced outputs 3 & 4) ...... C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 5 of 8 (balanced outputs 1 & 2) ...... C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 6 of 8 (balanced outputs 7 & 8) ...... C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 7 of 8 (balanced outputs 5 & 6) ...... C2603
LINE OUTPUT CONNECTOR CIRCUIT DIAGRAM sheet 8 of 8 (digital interface & conns) .... C2603
MICROPROCESSOR CPU CIRCUIT BOARD COMPONENT IDENT ..................................... AG2604
MICROPROCESSOR CPU CIRCUIT DIAGRAM sheet 2 of 6 (interface) ................................. C2604
MICROPROCESSOR CPU CIRCUIT DIAGRAM sheet 3 of 6 (CPU & memory) ...................... C2604
MICROPROCESSOR CPU CIRCUIT DIAGRAM sheet 4 of 6 (processing engine #1) ............. C2604
MICROPROCESSOR CPU CIRCUIT DIAGRAM sheet 5 of 6 (processing engine #2) ............. C2604
MICROPROCESSOR CPU CIRCUIT DIAGRAM sheet 6 of 6 (expander connectors) ............. C2604
FRONT PANEL CIRCUIT BOARD COMPONENT IDENT ....................................................... AG2423
FRONT PANEL CIRCUIT BOARD CIRCUIT DIAGRAM sheet 1 of 1 ....................................... C2423
DSP EXPANDER CIRCUIT BOARD COMPONENT IDENT ..................................................... AG2741
DSP EXPANDER CIRCUIT DIAGRAM sheet 2 of 3 (processing engine #1 & conns) .............. C2741
DSP EXPANDER CIRCUIT DIAGRAM sheet 3 of 3 (processing engine #2) ............................ C2741
Refer to SECTION A for information on installation, calibration
and operation of the DR128.
DR128 SERVICE MANUAL
Section B 3
INTRODUCTION
The information presented in this section of the manual is intended for competent technical personnel to carry
out service and product support for the DR 128. We assume that the reader is familiar with the related electronic
theory and audio terminology, and is able to carry out basic servicing, fault-finding and repair of digital audio
equipment of this type. Service personnel should also be familiar with audio systems, mains earthing and power
requirements, as well as handling precautions.
For information on the installation, operation and application of the DR 128 please refer to section
A of this manual.
Whilst we believe the information in this manual to be reliable we do not assume responsibility for inaccuracies.
We also reserve the right to make changes in the interest of further product development.
SERVICE AND TECHNICAL SUPPORT
Under normal operating conditions the DR 128 does not require user maintenance or internal calibration. Any
service work required should be carried out by qualified technical personnel only.
We are able to offer further product support through our worldwide distribution network. To help us provide an
efficient service please quote the unit serial number, the date and place of purchase in any communication
regarding this product
SAFETY WARNING !
Mains electricity is dangerous and can kill. Mains voltage is present within the unit. Except for
Installation and calibration, do not remove any covers with power connected. Do not carry out any
work within the unit while it is powered. High voltage components are insulated for safety but should
not be touched with power applied. The mains voltage setting is indicated on the AC mains input
socket on the rear panel. Check that this matches your local mains supply. Check your mains wiring
and earthing before switching on.
DO NOT REMOVE THE MAINS EARTH CONNECTION!
The chassis is always connected to mains earth. Audio 0V connects to the chassis internally.
Should problems be encountered with ground loops operate the audio ground lift switches on other
equipment connected to the unit or disconnect the cable screens at one end. Refer to the section
on 'EARTHING' in the User Guide.
WARNING: There is danger of explosion if the battery is incorrectly replaced.
Replace the battery with an Allen & Heath recommended part. Using a different battery, recharging or
dissassembling the battery may present a danger due to fire or explosion.
Dispose of used batteries promptly according to the manufacturer's instructions. Keep all batteries away
from childeren
IMPORTANT STATIC ELECTRICITY
PRECAUTIONS
Many of the components in the DR 128 are extremely sensitive to static electricity. The following
procedures reduce the possibility of damaging components:
1.)
2.)
3.)
4.)
5.)
6.)
Before handling any components or touching anything inside the unit, discharge
your body's static electric charge by touching a grounded (earthed) surface.
Wear a grounding wrist strap if one is available.
Do not remove parts from their antistatic containers or bags until you are ready
to install them. When removing circuit boards (PCBs) or chips from a unit,
immediately place them in an antistatic bag.
When handling (PCBs), hold them by their edges and avoid touching the circuitry.
Do not slide (PCBs) or ICs over any surface.
Avoid having plastic, vinyl and foam in your work area.
Limiting your movements during service work reduces static electricity.
DR128 SERVICE MANUAL
4 Service Procedures
Removing a connector circuit board assembly
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static electricity working procedures when carrying out service work. Ensure adequate
lighting and use the correct tools. Access to the connector circuit board options can be achieved without the
removal of the circuit board assemblies. To remove the lower connector circuit board assembly the upper
assembly will have to be removed first.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
Access to both connector circuit board options can be achieved at this stage. Refer to the
Hardware Configuration section in the Installation guide for information on changing the
connector board options.
2.) Unplug the harnesses to the connector circuit board assembly to be removed.
Upper connector
board assembly
A
B
Lower connector
board assembly
3.) Working from the rear of the unit, remove the connector fixing screws (A) and using a 5mm AF nut
driver remove the D type connector fixings (B).
4.) The circuit board assemblies can now be removed by carefully easing them off the plastic mounting
pillars.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from
inside the unit and check your work carefully before reassembly. To refit the connector circuit assemblies, follow
the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test for
correct operation.
DR128 SERVICE MANUAL
Service Procedures 5
Removing the CPU microprocessor circuit board assembly
Except for the battery (BAT1), there are no serviceable parts on the microprocessor circuit board assembly. If
a fault on the microprocessor circuit board is suspected then confirmation of a fault is by board replacement only
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static electricity working procedures when carrying out service work. Ensure adequate lighting
and use the correct tools.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
2.) Unplug the harnesses to the microprocessor circuit board assembly.
Microprocessor
board
assembly
DSP Expander
board
assembly
3.) Squeeze the tops of the plastic mounting pillars and ease each corner of the circuit board off each pillar.
Repeat the procedure for each pillar until circuit board assembly is free.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from
inside the unit and check your work carefully before reassembly. To refit the microprocessor circuit assembly
follow the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test
for correct operation.
DR128 SERVICE MANUAL
6 Service Procedures
Removing the front panel circuit board assembly
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static electricity working procedures when carrying out service work. Ensure adequate lighting
and use the correct tools.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
2.) Unplug the harnesses to the front panel circuit board assembly.
3.) Remove any DSP expander cards fitted to the microprocessor circuit board.
Front Panel
board assembly
DSP Expander
board assembly
3.) Remove the 8 circuit board fixing screws and carefully ease the assembly clear of the microprocessor
circuit board and clear of the unit.
The front panel LCD display circuit board is mounted onto the front panel circuit board assembly and can
be removed by unscrewing the 4 mounting screws.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from
inside the unit and check your work carefully before reassembly. To refit the front panel circuit assemblies, follow
the above procedure in reverse order. Make sure all LEDs and harnesses are correctly aligned and inserted
correctly. Test for correct operation.
DR128 SERVICE MANUAL
Service Procedures 7
Removing the power supply circuit board assembly
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static working procedures when carrying out service work. Ensure adequate lighting and use
the correct tools.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
2.) Unplug the the harnesses to the power supply circuit board assembly.
3.) Before disconnecting the transformer harness wires make a note of there colour and position on the
circuit board.
Power Supply
board assembly
Fuse - external DC input protection
4.) Unscrew the 2 circuit board mounting screws and remove the circuit board and heatsink assembly.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from
inside the unit and check your work carefully before reassembly. To refit the power supply circuit assembly
follow the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test
for correct operation.
DR128 SERVICE MANUAL
8 Spare parts
ORDERING A DR128 UNIT
To order a new unit please specify the model number and AC mains voltage required.
MODEL
DESCRIPTION
DR128
12 Inputs 8 outputs
ORDER CODE
DR128/volts
ORDERING AN OPTION
To order an option please specify the model number.
DESCRIPTION
DR1 DSP expander card
DR1 DSPD delay expander card
DR1 SYSNET option
ORDER CODE
DR1-DSPX
DR1-DSPD
DR1-SNET
MANUALS, SOFTWARE AND SUPPORT DOCUMENTATION
DESCRIPTION
DR128 User Guide
DR128 Service Manual
DR128 Brochure
DR128 WinDR Disk (1 of 2)
DR128 WinDR Disk (2 of 2)
ORDER CODE
AP2973
AP2974
AP2903
002-272
002-273
SERVICE TOOLS
The tools required to service the DR128 range of products are standard to an electronics service workshop and
are easily obtainable. The following items are necessary for disassembly and service access:
1-point Crosshead screwdriver (M3, 4AB)
2-point Crosshead screwdriver (M4, 6AB)
5mm AF Nutdriver
AT0004
AT0002
ORDERING AN ASSEMBLY
The following assemblies for the DR128 are supplied fully tested. Please quote the description and order code
for the part required.
Printed circuit (PCB) assemblies:
Power supply PCB assembly (inc heatsink)
Front panel PCB assembly (exc LCD display)
CPU microprocessor PCB assembly
Mic connector (Upper) PCB assembly
Line / Output connector (Lower) PCB assembly
002-205
002-187
002-184
002-185
002-186
40 way Master harness
26 way front panel harness
26 way Mic / Line harness
9 way Mic / Line power harness
9 way CPU power harness
26 way LCD display harness
AL2711
AL2713
AL2712
AL2705
AL2706
AL2714
IDC connector harnesses:
DR128 SERVICE MANUAL
Spares kit 9
Ordering a Spares kit
It is recommended that the spares kit order code 002-204 is held and maintained by the service agent to enable
in-field service repairs to the DR128 independent of the ALLEN & HEATH factory. Commonly available items
such as resistors, capacitors, tools and soldering equipment are not included. The contents of the kit is listed below.
Individual spare parts may be ordered. Please quote the description and order code for the part required.
DESCRIPTION
ORDER CODE
QTY
Fixings:
Screw 4AB x 5/16" Pan Pozi Black
Screw M2.5 x 4mm Pan Pozi Black
Screw M3 x 10mm Pan Pozi Black
Screw M3 x 16mm Pan Pozi Black
Screw M4 x 8mm CSK Pozi Black
Screw M3 x 8mm SKT Dome Black
Half Nut M3
Nylock Nut M3
Washer M3 Shakeproof
Pillar M4 x 8mm Nylon
Pillar Support 6.4mm Nylon
Pillar Snap-in 6mm Nylon
Pillar Snap-in 31.8mm Nylon
Pillar M2.5 x 9mm Nylon tapped
Pillar M3 x 6mm Nylon tapped
Spacer M3 x 15mm Nylon
AB2810
AB2944
AB0076
AB0079
AB2777
AB2942
AB0094
AB0102
AB0244
AB0256
AB2171
AB2233
AB2772
AB2945
AB3098
AB2775
10
5
5
5
5
5
5
10
5
4
4
4
4
4
4
4
Potentiometers, switches, and connectors:
5KD reverse (502RD)
Switch 2PCO Momentary
Preset 4K7 (Output gain)
Preset 22K (Line input gain)
Button 12.5mm Square Black
Button Round Black
Button Round Grey
Phono Dual PCB mount
XLR 3 Pin Female PCB Mount
XLR 3 Pin Male PCB Mount
AI8111
AL8058
AE2871
AE2969
AJ0348
AJ2887
AJ2888
AL0556
AL2414
AL2413
5
10
4
2
15
5
5
2
5
5
AE2754
AE8069
AE0020
AE0221
AE0046
AE2818
AE2742
AE2857
AE2656
AE0345
AE2749
AE2755
AE2748
5
10
10
5
2
1
1
3
2
1
2
1
1
AH0205
AL0206
-
LEDs and Semiconductors:
LED 5 x 2mm Tri-colour
Transistor 2SB737 PNP
Transistor BC549 NPN
IC NE5532N Dual Op Amp
IC TL072 Dual Op Amp
IC LM393N Comparator
IC MAX 202CPE RS232
IC AK5391-VS 24-bit ADC
IC CS4329-KP 20-bit DAC
IC CMOS 74HC03 4 NAND 2
IC CMOS 74HC165
IC CMOS 74HC4094
IC TLP521-4A Quad Opto
POWER SUPPLY:
Mains lead IEC-2pin EURO
Mains lead IEC-3pin UK
DR128 SERVICE MANUAL
10 Spares kit
Mains lead IEC-3pin US (C33)
Mains Fuse 20mm T1.6A (USA,CAN)
Mains Fuse 20mm T630mA (UK,EU)
Mains Fuse 20mm T5A (ext DC protection)
Transformer 60VA
Bridge Rectifier 4A in line
IC Regulator 7805 (+5V DC)
IC Regulator 7815 (+15V DC)
IC Regulator 7915 (-15V DC)
IC Regulator Adjustable LM2575T-ADJ
IC Regulator Adjustable LM2576T-ADJ
IC Regulator LM2576T-5.0 (+5V)
Transistor MOSFET RFP8P05
Diode 6A05 6A 50V
Diode UG1B Fast/Soft 1A 100V
Diode UG8AT Fast/Soft 8A 50V
Diode SBYV28-100 UltraFast 3.5A
Zener Diode BZX55C2V7
Inductor 100uH 3A S/SWITCH
Inductor 470uH 2A S/SWITCH
Inductor 68uH 3A S/SWITCH
Insulating kit TO220
AL0323
AL0466
AL0297
AL2270
AM2757
AE0351
AE0308
AE0047
AE0048
AE2814
AE2816
AE2815
AE2977
AE2819
AE2820
AE2821
AE2947
AE0231
AE2825
AE2826
AE2827
AA0693
5
5
5
1
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
6
002-203
AA2717-LR
AA2735
AL0334
AE2734
AP2837
AE2970
AF3107
5
1
5
5
Miscellaneous:
DR128 Packing assembly
DR128 Rack mounting brackets (per pair)
DR128 Acrylic Fascia
Jumper socket
Front panel LCD display
Battery 3V 180mAh PCBV (DR1 CPU PCB)
Inductor 150uH 280mA (Mic Connector PCB)
EMI filter 470pF 100V (Connector PCB assy)
DR128 SERVICE MANUAL