Casio VM-570B Service manual
(with price)
INDEX
LCD VIDEO MONITOR
VM-570B
JUNE 1994
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
R
POWER SUPPLY
VCC2
VEE1
VCC7
VCC6
GND
DC 6V
from IC400
Vref
GND
C151
Q100
R101
R103
C152
Q101
Q102
R104
C153
T100
LC12U-21
2
1
9
8
D115
3
4
D116
5
D117
6
7
D118
L101
C115
C116
C117
C118
Fig. 3
The power supply consists of DC-DC converter, and causes the voltages to be output as shown in 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
Table - 2
— 3 —
ADJUSTMENT
Linear PCB
1) Items to Be Adjusted:
Item Measuring Instrument
VCC2 voltage setting Voltmeter
Contrast adjustment TV signal generator, Pattern generator, Oscilloscope
AGC adjustment TV signal generator, Pattern generator, IF levelmeter
2) Adjustment and Test Point Locations:
TOP VIEW
TP1
VR100
— 4 —
TP5
BOTTOM VIEW
TP3
R200
TP2
Pad IF
3) Equipment Connection / Procedure
Vcc2 Voltage Setting
Set
Voltmeter
Output
TP1
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Adjust for
VR100 TP1
Voltmeter
Adjust for 4.00 ± 0.02V
reading on voltmeter.
* Open soldering pad IF.
VHS
HQ
AV
Jack
Color bar
Contrast Adjustment
PLAY
Input Output
AV-C1
cord
OscilloscopeVCR VR300 TP5
— 5 —
Set Oscilloscope
TP5
Adjust step form wave to read
0.8 ± 0.05 Vp-p.
A/D PCB
1) Item to Be Adjusted:
Item Measuring Instrument
Clock adjustment Voltmeter
2) Adjustment and Test Point Locations:
TOP VIEW
TP6
3) Equipment Connection / Procedure
Set
VR700
Clock Adjustment
Voltmeter
Output
TP6
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Adjust for
VR700
Voltmeter
— 6 —
TP6
Adjust for 2.00 ± 0.05V
reading on voltmeter.
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