Casio QV-780, Service Manual & Parts List

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1
2
3
4
5
6
7
8
VCC1-1
IC582
IC582
VCC1-1
VCC3-1 VCC3-1
PON
KEY0
KEY1
KEY2
SHTTER
GND
GND
CN504
R593
C592
R592
1 2 3 4
8 7 6 5
R594
R585
Q588
R595
R579
Q583
2
2
3
1
3
1
C590
VCC1-1
Q582
1
3
2
5
4
IC584
IC586
1
2
3
FU152 R590
C525
+
OUT
VDD
GND
NC
NC
CK D Q GND
VCC
PR
CLR
Q
1
PON from
Key PCB
VCC1-1
Q580
1
2
3
2
APO from Pin 202
of IC500
6 Voltage detection signal
3
POB to Pin193
of IC500
4
FACT from
Pin 195 of IC500
IC588
VCC1-1
VCC1-1
VCC
GND
VCC
GND
5
1
2
3
4
6
5
4
3
8
5 Power ON to Pin 1 of Q155
1
2
7
POWER SUPPLY CIRCUIT OPERATION
1
2
3
4
5
6
Signal
PON
APO
POB
FACT
Power On
Voltage
detection
Operation
Power on/off signal (pulse) from Key PCB
Auto power off signal (pulse) from pin 202 of IC500
Power on/off recognition signal to pin 193 of IC500
ON: H (VCC3)
OFF: L (GND)
Forced power on signal from pin 195 of IC500
Forced ON: H (VCC3)
OFF: L (GND)
ex. While writing to flash memory
Power on/off signal to pin 1 of Q155
ON: H (VCC1)
OFF: L (GND)
Normal: H
Low voltage: L