Casio VM-570B Troubleshooting guide

R
(with price)
Page
Specifications.............................................................................................1
Block Diagram ...........................................................................................2
Power Supply.............................................................................................3
Adjustment
Linear PCB..........................................................................................4
A/D PCB..............................................................................................6
Printed Circuit Boards................................................................................7
Wiring Diagram........................................................................................10
Electrical Parts List ..................................................................................11
Mechanical Parts List...............................................................................16
Exploded View / Disassembly..................................................................17
Waveforms...............................................................................................18
Schematic Diagrams................................................................................19
LCD VIDEO MONITOR
VM-570B
JUNE 1994
INDEX

POWER SUPPLY
— 3 —
Fig. 3
The power supply consists of DC-DC converter, and causes the voltages to be output as shown in Table - 2.
Table - 2
Name Voltage Function
VCC2 4.0 ±0.02V Main voltage
VCC6 48.0 ~ 72.0V Tuning voltage
VCC7 28.0 ~ 40.0V Display voltage
VEE1 -8.4 ~ -5.6V Display voltage
DC 6V
GND
from IC400
Vref
GND
VCC2
VEE1
VCC7
VCC6
D115
D116
D117
D118
Q102
C152
Q101
R104
T100
LC12U-21
L101
C151
Q100
R103
R101
C153
C115 C116 C117 C118
2
1
9
8
3
4
5
6
7

ADJUSTMENT
Linear PCB
1) Items to Be Adjusted:
— 4 —
Item Measuring Instrument
VCC2 voltage setting Voltmeter
Contrast adjustment TV signal generator, Pattern generator, Oscilloscope
AGC adjustment TV signal generator, Pattern generator, IF levelmeter
VR100
TP1
2) Adjustment and Test Point Locations:
TOP VIEW

BOTTOM VIEW
— 5 —
Adjust step form wave to read
0.8 ±0.05 Vp-p.
OscilloscopeVCR VR300 TP5
Color bar
AV
Jack
Set Oscilloscope
Input Output
TP5
AV-C1
cord
Contrast Adjustment
* Open soldering pad IF.
Adjust for 4.00 ±0.02V
reading on voltmeter.
Voltmeter
VR100 TP1
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Adjust for
TP1
Set
Output
Voltmeter
Vcc2 Voltage Setting
3) Equipment Connection / Procedure
TP5
TP3
TP2
Pad IF
R200
VHS
HQ
PLAY

A/D PCB
1) Item to Be Adjusted:
— 6 —
Set
Output
Voltmeter
TP6
Clock Adjustment
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Adjust for
Voltmeter
VR700 Adjust for 2.00 ±0.05V
reading on voltmeter.
TP6
Item Measuring Instrument
Clock adjustment Voltmeter
2) Adjustment and Test Point Locations: TOP VIEW
3) Equipment Connection / Procedure
VR700
TP6

— 7 —
PRINTED CIRCUIT BOARDS
Linear PCB (Top View)
Linear PCB (Bottom View)
JK600
JK250
VR301 R321
R326
R325
C317 Q300 R327
R328
C313
R308 R307 R340
C311
R306
CN700
R329
C310
H300
R120
C315
C116
C119 C117
C312
VR
300 T100
D110
R435
C115
L101
C610
C118
CN600 C110 CN100
VR
100 FU100
C612
C611
VR600
VR800
SW100
C410
R323 R322
C351
R302
R305
R304
C350
R301
C352 R303
C358
R316
C359
R114
R315
IC300
R603
R310
R320
C356 R318
C357 @
R314 R317
R313
R312
C355
C450 IC400
D118 R104
D117
C190
Q102 C153C160
Q101
Q100 R101
C151
R100
R103
D115
D116
C152
R606 R605R600
C653
R602
C652 R601IC600

A/D PCB (Top View)
— 8 —
DC PCB (Top View)
BL PCB (Top View)
JK100
D150
T900
CN300
Q900
L900 Q901
C952
R900
C953
C811 C813 C810
C815
C812
C770
C850 R800
C710 R804
C781
L701
R721
C780
C782
D730
C700
VR700
C761
C762 R709C783
D700
R722
D711
D710
R720

— 9 —
A/D PCB (Bottom View)
C772
C777
R715
R716
R717
IC700
C775
C776
R704
R712
(C.D)
R711
(A.B)
R703
R702 R701
C763 R708
R707
R700
R710
L700
D800 Q806
C771
R820 R815
R801
C860
R818 R819 R816
R817
C861
C856
Q805
Q802 D810 D811
R808
Q800
R802
R803
R807
Q801
R806
C855

WIRING DIAGRAM
A/D PCB
— 10 —
Linear PCB
22
122
1

EXPLODED VIEW / DISASSEMBLY
— 17 —
17
1
34 2-1
2
2-2
32
5-1
8
32
4
37
2-4
2-3
2-5
2-2
7
31 30
33
10
11 @@
2-2 5
6
9
16-2
16-1
13
14
15 16
12
19
20
21
22 22
36
26
35
25
28
23
23-1
23-5
23-3
23-4
29

WAVEFORMS
— 18 —
7Q102 Base
0Q800 Base
1IC300 Pin 1
4IC300 Pin 4
8IC700 Pin 17
AIC700 Pin 12
2IC300 Pin 23
5IC300 Pin 5
9IC700 Pin 14
3IC300 Pin 10, 11, 12
6Q102 Collector
64µsec
600mV
1.0V
0.22µsec 64µsec
2.1V
64µsec 64µsec 3.9µsec
2.4V
2.6V
14V
4.0µsec 152nsec 547nsec
2.5V
2.3V
2.2V
420mV
2.5V
132µsec 63.5µsec

— 19 —
Linear PCB SCHEMATIC DIAGRAMS
76TP1
1
2
TP5 5
4
3

— 20 —
A/D PCB
8
TP6
9
11
10

BL PCB
— 21 —
C952
ECQ-V1H184JZ
2
3
1
GND
SP
LAMP
SP
VCC1-1
T900
NT-01
L900
RCH-875-101K
Q900
2SD965-R
Q901
2SD965-R
DE0905
SL181J2K
EYP-1BF102L
EYP-1BF102L
C953
5
4
3
2
112
10
To Linear PCB