Troubleshooting Guide - Sanyo VPC-CG9BK Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
PUSH THE POWER
SW FOR A WHILE
HIGH
IC301-14
CHECK POWER SW
KEY_POWER INPUT
LOW
LOW
IC301-9, 36, 59
(VDD)
HIGH
LOW
IC301-53
(RESET)
HIGH
LOW
IC301-49
(BAT OFF)
HIGH
NO
IC301-55
OSCILLATION
YES
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
IC101-AK20 (XOUT)
NG
NO OPERATION IF ABSENT
CHECK
OSCILLATION CHECK X1102 OSCILLATOR
OK
INCORRECT HANDSHAKING
NG
IC301-63, 64
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 X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-24, 52
KEY INPUT
IC501-D5, F6 (PON)
Q5005-2 (PON2)
Q5004-1 (PAON1)
IC503-4(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