Download Goldstar MBM-2105GIA User's Manual

GolclStar
MONOCHROME MONITOR
MANUAL
WTISERVICE
ON
BEFORE SERVICING THE CHASSIS, READ THE “SAFETY
PREtXJTK)NS”,
IN THIS MANUAL
MODEL: MBM-2105GIA
(MC-3 CHA=W
B GoldStar
FEATURES
l
l
l
2000 display characters in a 8 x 8 dot format.
18 MHz bandwidth, medium class, composite signal input.
This monitor is compatible with a variety of home and personal computers
CONTROLS LOCATION
The MBM-2105GIA
The input signal is
The input signal is
Figure 2 shows the
monochrome monitor uses a RCA jack connector.
input through the RCA jack connector.
based on the composite level.
monitor controls on the front and rear panels.
r---
\
-[
/ t yLcPower
Contrast
I
Brightness
Indicator
Power
Video In
H-Size
H-Position H-Hold V-Sue Power Cord
Figure 2, Monitor Controls
NOTE: Monitor cabinet not used on 6300T Models.
0 POWER (PUSH-ON)
Turn on the monitor by pressing the power switch.
The power indicator lights when the power is ON.
Always turn on the monitor before you turn on the
computer.
To turn the power OFF, just press this switch again.
0 Brightness
Turn this knob clockwise to increase brightness.
0 Contrast
Turn this knob clockvvise
to increase contrast.
0 V-Size
Turn this knob to adjust the vertical size of the
picture.
0 H-Hold
Turn this knob to stop horizontal rolling of the
picture.
0 H-Position
Turn this knob clockwise to move the center of the
picture to the right; turn the knob counterclockwise
to move the center of the picture to the left.
0 H-Size
Turn this knob to adjust the horizontal size of the
picture.
CIRCUIT
DESCRIPTION
1. VIDEO AMPLIFIER
2. POWER SUPPLY
The 120V AC line voltage is applied to the primary
of the T901 where it is stepped down through the
secondary winding to approximately 17V (AC).
After passing through the bridge rectifier circuit
and filter (C905) the regulated DC supply voltage
is approximately 18V (DC). The 18V unregulated
B+ voltage is applied directly to the collector of the
B+ regulator (TR901). A voltage divider network
(R905, VR901, R906) in which the B+ adjustment
control (VR901) is used to establish the desired
operating level (12V DC). When AC input voltage
variations occur, a correction voltage is produced
at the base of TR903 and is coupled directly to the
base of the error amplifier (TR902). This correction
voltage is then passed from the emitter of TR902
directly to the base of TR901 and B+ voltage
regulation is then accomplished.
The Fig. 3 details the cascade video amplifier.
Video amplification is provided by the TR303 and
TR304. TR303 and TR304 are connected in a
cascade configuration. TR303 operates as a
common emitter and TR304 operates in the
common base configuration. This minimized the
miller effect input capacitance and the difining
breakdown parameter for TR303 which becomes
BVCBO as opposed to BVCEO.
This enables selection of a higher speed/lower
breakdown transistor to be used in the video
amplifier.
The emitter of TR304 is driven by the collector of
TR303 which is a high frequency transistor.
Overall voltage gain for the stage is determined
by the ratio of R312 to R316. Bandwidth is within
3dB to 32 MHz.
R316
1 .ZK/ZW
R314
TO@ <
c305
lOOuF/‘16V
L301
4.7uH
7
l TO
+
2~ C308
2.2uFll
TR304
KTC2229
v
0
oov
;
+
l
R317
330
TO @
R309
75
3
TR303
2N3904
C306
12OP
R313
47
Figure 3, Video Ampllfler
TO CRT CA.THODE
Vertical
Oscillator
1
Vetical Frame
Vcc 2 Generator
F,B)
vcc 2
Oscillator
Generator
1
Vertical
output
Power
Amplifier
Input
Frame-Synchro
Horizontal
output
Line Fly Back Phase
Input
Detector
Horizontal
Oscillator
Figure 4, BLOCK DIAGRAM OF THE TEA 2037A
3. COMPOSITE VIDEO INPUT AND HORIZONTAL/
VERTICAL
DEFLECTION
3-l VIDEO INPUT (PIN 15)
The detection level for negative sync pulse at the
sync separation input (pin 15) is set at 1.6V. When
the voltage at emitter of the Transistor (pin 15) is
above
1.6V, the transistor is cut off. Voltage
lower than 1.6V enables the transistor to conduct
a n d t h e internal circuitry
i s enabled for
synchronization function.
3-3 LINE (H) OSCILLATOR (PIN 9)
The line oscillator is of the type which charges and
discharges a capacitor, since a perfectly linear
sawtooth wave form is not required.
The free running frequency is dependent on C705,
R705 and VR702 and is governed by this expression To = 085 x C705 x R705 where To is the line
oscillator free running frequency.
3-4 FRAME(V) OSCILLATOR (PIN 9)
Oscillator thresholds are internally fixed by
resistor C601, R603 are used to determine the
free-running frequency, the oscillator
free-running frequency is given by To = 0.15 x
C601 x R603.
3-2 COMPOSITE VIDEO INPUT (PIN 15)
ADJUSTMENT
1. REGULATED B + ADJUSTMENT (VRSOl)
5. HORIZONTAL POSITION NR701)
Connect high impedance voltmeter between
TR901 emitter and ground rotate the B +
adjustment control (VR901) to obtain a reading of
12.0 2 O.lV.
2. FOCUS (VR704)
Adjust the focus control (VR704) for best overall
focus of the test pattern (marked with the symbol
“%“). Usually the center and corners of the
screen do not focus at the same setting and a
compromise must be made.
3. VERTICAL SIZE (VR601)
The vertical size control (VR601) should be adjust
for the picture to fill the screen vertically.
4. HORIZONTAL SIZE (L703)
The horizontal size control (H-site coil) should be
adjusted for the picture to fill the screen horizontally.
BLOCK
V,deo Input
0
6. SUB-BRIGHT (VR703)
Adjust subbright control (VR703) for visual cut off
of the raster when external brightness is turned to
maximum
7.
CENTERING
ADJUSTMENT
It the raster is not centered horizontally and vertically it may be centered by removing the cabinet
back and adjusting the centering tabs on the neck
of the tube, located at the rear of the deflection
yoke. Turn the whole device clockwise or
counterclockwise. To increase the amount of raster
shift move the two tabs which project from the
device farther apart, if raster is tilted on an angle,
it may be straightened by loosening the deflection
yoke clamp and rotating the deflection yoke.
DIAGRAM
Video Output
TR303, TR304
Video Preamphf~er
TR301.
The horizontal position control (VH701) snould be
adjusted for the horizontal picture position.
TR302
TEA 2037A
A C 12OV
60Hz
LllW
Filter
POW&Y
TMlS
PW+.?r
REG.
,
+12v
SCHEMA1
CONTRAST
VR301 5008
-
.-
I
-
R602
15
!
H.V OEFL
-
+y-+$ll.2
4
TR902
Kltl959-O/Y
0901-0904
TEA2037
12.7
C908
c905
2200/2!
lN5392GP.4
t-
-
1
A
F901
T750mA 25OV
IUL/CSAI
1315mA25OV
NDE/SEtlKOI
20.6
3
MnJ%H.HOLD u
VR702
-
4th
R705
33K
12Ul
b.lK
I
2
-
u
NOTES: 1. RESISTORS ARE SHOWN IN OHMS
K = 1.000
M = 1.000.000
THE
2. CAPACITORS ARE SHOWN
ONLY
TOLERANCE UNLESS OTHERWISE NOTED
I
B
4 ItlPORTANT
MA R K O F
SAFETY NOTICE b
THIS SCHEHATIC
DIAGRAM
INCOI
ELECTRICAL SHOCK HAZARDS. WHEN SERVICING IT IS
3. All RESISTORS ARE f 5%
A
SYMBOL
FEATURES IMPORTANT FOR PROTECTION FROM X-RADIA
IN UF OTHERWISE NOTED P : cc Ir
1
u
MANUFACTURER’S
SPECIFIED
COl’lPONENTS IN THE&YUBOL
I
C
PARTS
BE
USED F
MARK OF THE SCHE
DIAGRAM
3OvI+
23VI-r
IHI
IV1
N-i
/
9lOKGB3UGREENl
mKGB4*wmENl
9lDKMUBLACK/WHTE)
9lDKGB
3 9 IYELLOWISH GREEN1
- 5OVP-P M/VI
/
H.LW.
01G.h
R719
0
;
RltO
b7K
:
R7K
VR703
;;,2
,/,6ti
cn@
FBT
7701
A
f &l/l5
,
*
c708
L.7/50
_.
R7u
33K
BRJT.
R711
l5K
R7Y
6.Y
I 1
R7OI
1
L.wv
tl.OUl
c717
OwLI/
loowl
1
vR705
2sOKn
EXT.
BRIT
1ooK
cm
lw/
100
‘?
070)
RGPlOD
!rl!JE
20
3
c7l4
o%ll
!!z’
FOilIS
l
1’05 5 c7l5
u3wl 0 . 0 1 / A
lK
RIM
‘711
Lltw
\
(BOOST UP1
\
&
\I-Ln
3Vr-r
6‘3
&lb
\
IHI
‘-- 2oovp+
IH’
4 IMPORTANT AVIS SUR LA SkURlTi. b
TES
SPECIAL
LA m SYMBOLE MARQUE DE CE DIAGRAMME SCHEIIATIQUE
FIRE AND
CARACTkRISTIQUES
IllAL T H A T
DES
iE CRITICAL
51 D E S PIiCES D E CETTE A S Y M B O L E MARWE
DANGE
R
S
COMPREND DIIIPORTANTES
SPkIALES CON$UES P O U R PROTiGER
D~NCENDIE
ET D E
D E S R A Y O N S X.ET
SECOUSSES ELE~TRIQUES. E N cAs D E BEsolN
DOlfENT ETRE REIIPLACE’S
N’UTILISEZ WE D E S PIkES SPkIFItES P A R L E H A N U F A C T U R I E R .
D
I
E
F
484-309A
G
TROUBLESHOOTING
GUIDE
TR902,
TR903.
D905.
TR901 A N D P O W E R
REG CIRCUIT
7
~.
YES
I
D706,
TROUBLE
NO
, C H E C K C R T (GZ) V O L T A G E 4 5 0 V
-,
2 C H E C K C R T ( H E A T E R ) V O L T A G E 12V
c713. c714. c715
IN
FBT. CR706 R712
L E A D (HI,. L E A D (Vl, V2)
YES
C H E C K C R T CATHOD
ABOVE
VOLTAGE
55V
*
45-55v
TROUBLE IN
T R 3 0 3 , TR304.
R315,
R314,
R311.
R309.
R310.
R312
YES
VR703
(SUB-BRIGHT,,
VI?,05
(MT B R I G H T , , TRW,
R710.
R711.
TR302.
“R301
(CONTRAST,,
VIDEO CABLE
HORIZONTAWERTICAL
SYNC
TROUBLE
I
SYNCTROUBLE
REF.
TR301.
TROUBLE
R719.
C716.
IN
R70B, R720.
I
NO.
FIGURE
OEBCRIPTION
B
TR302.
TR902,
TR903.
TR601
-C
w
L
TR304
K T C ,015
KTC 1959
K T A 562TM
K T C 1815
KTC 2229
t
k
c
B
>
TR701.
TWO1
9
BCE
T E A 2037A
IC701
I
B U 806
K T D 880
l@a
2N 3904
TR303
-0
E
PRINTED CIRCUIT BOARD
1. MAIN PCB
ASSY PIN: 1 lo-BOW
ASSY PIN: ilO-B72A
J
GSEP-2112
TI
BLACK
3. MAIN PCB (SOLDER SIDE)
4. LINE FILTER PCB (SOLDER SIDE)
O-0
Lsol
I
EXPLODED VIEW
REPLACEMENT PARTS LIST (MECHANICAL PARTS)
8
9
10
11
12
13
*Outer Cabinet not used on 6300T Models.
D
C
I
1
3X3-A02A
___
.-
, 1ILr.I w
1 COVER ASSY. B&
407-622A
407.696A
303.924A
, I-LAIE., “x-t WNR ruvvcn,
1 C O V E R , C R T BOARD
I
303.928A [ COVER, PCB SHIELD CASE 1
E
I
F
REPLACEMENT PARTS LIST
CAUTION: Components identified by the A symbols in the PARTS LIST and on the SCHEMATIC DIAGRAM
have special characteristics important to safety.
Do not degrade the safety of the set through improper servicing.
ABBREVIATIONS:
Capacitors . . . . CC: Ceramic (TC), CE: Chemical, CK: Ceramic (Hi-K),
BP: Bipolar, CQ: Mylar, PE: Polyester, PP: Polypropylene
Resistors . . . . RD: Carbon Film, RS: Metal Oxide Film
(All CC and Capacitors are + 5%, 50 Volts and all resistor, +5%, 118W unless otherwise noted).
S: Recommended Service Parts, R: Replacement Service PatIS
REF.NO.]PART
N O . 1
DESCRIPTION
REMAR
REF. NO.
RESISTOR
R301
Fi302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
R313
R314
R315
R316
R317
R318
R319
R320
R321
R601
R602
R603
R604
R605
R606
R607
R608
R609
R610
R611
R612
R613
R701
R702
R703
R704
RD. 118W 7 5 o h m
RD. 118W 1 2 0 K o h m
RD. 118W 8 2 K o h m
RD. 118W 6 8 0 o h m
RD. 118W 2 2 0 o h m
RD, 118W 3 9 0 o h m
RD. 118W 1 0 0 o h m
R D 118W 5 6 o h m
R D . 1/8W 10K o h m
RD. 118W 1 3 K o h m
R D 118W 7 5 o h m
RD. 118W 8 2 o h m
RD. 118W 4 7 o h m
RD. 1/8W 2 4 K o h m
RD. 118W 3 3 K o h m
RD 2W 1 2K ohm
RD. l/SW 3 3 0 o h m
RD. l/SW 1 2 0 o h m
RD. 118W 1 O K ohm
R D 118W 1 0 0 o h m
RD. 118W 4 7 K o h m
RD. 118W 3 3 o h m
RD. 118W 1 5 o h m
RD. 118W 5 6 0 K o h m
RD. 118W 2 2 o h m
RD. 118W 1 8 o h m
RD. l/SW 1 5 0 K o h m
RD. 118W 3 9 0 K o h m
R D . 1/8W 82K o h m
RD. 118W 2 2 o h m
RD. 118W 1 OK ohm
RD. 118W 8 2 o h m
RD. 118W 6 8 K o h m
RD. 118W 1 5 0 o h m
RD. 118W 1 5 0 o h m
RD. ll8W 5 6 0 K o h m
RD. 118W 3 9K ohm
RD. 118W 4 7 K o h m
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
A
R
R
R
R
R
R
R
R
R705
R D . 118W
3 3 K o h m +20/o
R
R706
RD. 118W
470 ohm
R
R707
RD. 118W
33 ohm
R
R708
RD. 112W
6 8K ohm
R
A
R709
R710
R711
R712
R714
R715
R716
R717
R718
R719
R720
R901
R902
R904
R905
R906
R907
VR301
VR601
VR701
VR702
VR703
VR704
VR705
VR901
PART NO.
DESCRIPTION
RD. 118W 8 2 0 o h m
RD. 1/8W 4 7 K o h m
RD. 118W 1 5 K o h m
RD. 118W 3 3 K o h m
R D . 118W 10K o h m
R D . 118W IOOK o h m
RD. 118W 6 8 K o h m
RD, 118W 3 3 K o h m
RD. li8W 1 5 K o h m
RD. 118W 1 8 K o h m
RD. 118W 6 8 k o h m
RD. 1/8W 2 2 K o h m
RD. 1/8W 7 5 K o h m
RWR, 7W 18 ohm
RD. 118W 3 9 0 o h m
RD. 118W 5 6 0 o h m
RD. 118W 5 6 0 o h m
VARIABLE 5008
SEMIFIX S R 2 9 R 2 2 0 8
SEMIFIX S R 2 9 R 1KB
SEMIFIX S R 2 9 R 4 7KB
SEMIFIX S R 19R 1OOKB
SEMIFIX H162lC 3 3 M B
VARIABLE 250KB
SEMIFIX S R 19R 2 2 0 8
3EMARl
R
w
R
R
R
R
R
R
R
R
R
R
H
S
R
Fi
R
S
S
S
S
S
S
S
S
CAPACITOR
c301
C302
c303
c304
c305
C306
c307
C308
c309
c310
C601
C602
C603
C604
C605
C606
C607
C E , 47uF 16V
CE, 22OuF 1 6 V
CE, 22uF 16V
C E , 47OuF IOV
C E . 1OOuF 1 6 V
C C , 12OpF 5OV
C E , 4 7 u F 1OV
C E , 2 2 u F IOOV
CC, IOOpF 5 0 V
CE, IOuF 1 6 V
C O . 0 2 2 u F IOOV
C E . 22OuF 16V
CE. 47uF 16V
C O , 0 IuF IOOV
CE. 1OOOuF 1 6 V
C O , 0 2 2 u F 1OOV
C O , OOOluF 1OOV
R
R
R
R
R
R
R
R
R
R
S
R
R
S
R
s
R
REF. NO.
A
DESCRIPTION
PART NO.
CE. 2 2uF 160V
CE. 1OOuF 16V
CO, 0 1uF 1OOV
CE. 1 OuF 25V
CO, 0 0022uF 1OOV
PP 0 0022uF 200V
CO, 0 0022uF 1OOV
CQ. 0 015uF 1OOV
CE, 4 7uF 25V
PP. 0 027uF 400V
CE, 47OuF 25V
CE. 22OuF 16V
BP. 4 7uF 25V
CE, IOOuF IOOV
CE, 1OOuF 1OOV
CK. OOluF 1OOOV
CC. 56pF 50V
CO, 0 0047uF IOOV
CK. 0 OluF 50V
CK, 0 0047uF 50V
CK, 0 0047uF 50V
CK, 0 0047uF 50V
CK, 0 0047uF 50V
CE, 22OOuF 25V
CK, 0 1uF 50V
CE, 47uF 16V
MPP. 0 1uF 125V
CK, 0 0022uF 125V
CK, 0 0022uF 125V
C608
c701
C702
c 703
c704
c705
C 706
c707
C708
C709
CT10
(1711
c’712
C713
c714
A C715
C716
c717
c-718
c90 1
cc)02
c903
c904
c905
C906
C908
A c91o
A C911
A c912
REMAR
R
R
s
R
R
S
R
R
R
s
R
R
S
R
R
R
R
R
R
R
R
R
R
R
R
R
S
S
S
COIL
A
L301
L302
L701
L702
L703
L704
L901
Q
A
A T701
A
A F901
A S901
NE301
SG301
VIDEO IN
SIGNAL
CABLE
A
A
A
A
A
A
A
A
1 g-0053
1 g-0052
1 g-0051
1 g-0050
1 g-0049
19-0048
1 g-0047
KDSl555
1 N4002
KDSl555
ZENER 62x83.C6V2
KDSl555
KDSl555
RGP25D
RGPZOG
RGPlOD
RGPlOD
RGPlOM
1 N5392GP
1 N5392GP
1 N5392GP
1 N5392GP
ZENER BZX83-C6V2
LED (GREEN)
TRANSISTOR
TR301
TR302
TR303
TR304
TR601
A TR701
19-0046
1 g-0045
1 g-0044
KTC 1959-Y
KTA562 TM-Y
2N3904
KTC2229-Y
S
S
S
S
KTC2240.GR
S
S
BU806
1 l-0023
07-0009
fd Icy
OO-6300-5?T
“j&c hl c\l
..
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
20-0038
Vl. v2
S
D301
D601
D602
D603
D604
D701
D702
D703
D704
D705
D706
D901
0902
D903
0904
D905
P902
PEAKING PL 4 7uH
PEAKING PL 3 3uH
CHOKE IOuH
H~LINEARITY
COIL WIDTH
PEAKING PL 1OuH
LINE FILTER
20-0039
S
S
S
S
S
S
S
MISCELLANEOUS
I c.
DIODE
20-0040
t,> s 77
-
CRT, 310KG531
(Green)
CRT, 310KGB4A
(Amber)
FBT
DY ASSY
PCB MAIN
FUSE 0 75Ai250V
SWITCH, POWER
S
S
S
S
S
S
S
NEON LAMP 95V
S
SPARK GAP
JACK, RCA PHONE
RCA TO RCA CABLE
R
R
R
SOCKET CRT
WIRE ASSY SHIELD
TRANS. POWER SHIELD
PWB LINE FILTER
AC POWER CORD
PC BOARD COMPL. W/TRAY
CONNECTOR ASSY FOR TR901
CONNECTOR ASSY FOR LED
R
R
S
S
R
R
R
R
PRINTED MATTERS
KIT, PRINTING
OWNER’S MANUAL
PIN. STAPLE NO 10
BAG, PE
3
77-7
J-
R
R
R
R