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5. TROUBLESHOOTING GUIDE
POWER LOSS INOPERTIVE
PUSH THE POWER
SW FOR A WHILE
HIGH
IC301-54
CHECK POWER SW
SCAN IN 4 INPUT
LOW
LOW
IC301-9, 38, 62
(VDD)
HIGH
LOW
IC301-56
(RESET)
HIGH
LOW
IC301-52
(BAT OFF)
HIGH
NO
IC301-61
OSCILLATION
YES
NO
IC301-58
OSCILLATION
YES
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
IC101-AB19 (XOUT)
NG
NO OPERATION IF ABSENT
CHECK
OSCILLATION
CHECK X1102 OSCILLATOR
OK
INCORRECT HANDSHAKING
NG
IC301-67, 66
BETWEEN 8-BIT CPU AND ASIC
(ASIC_SO, ASIC_SI)
CHECK EACH INTERFACE
OK
CHECK SOLDERING
OF MEMORY
EACH PIN
CHECK IC302
CHECK IC302
CHECK IC302
CHECK X3001
CHECK X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-25, 55
KEY INPUT
IC501-26, 32, 30, 31
(P ON, PAON,
PAON2)
SERIAL
COMMUNICATION
CHECK CP1 DMA
BLOCK
– 23 –
NO
CHECK UNIT SW
YES
CHECK IC101, IC301,
LOW
PWA BLOCK,
CAA BLOCK
HIGH
NG
CHECK IC301,
CP1 DMA BLOCK
OK
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