Troubleshooting Guide - Sanyo VPC-AZ3EX Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
PUSH MAIN SW
NO
IC301-45 (SCAN IN 6)
CHECK CN303-3
PULSE INPUT
YES
LOW
IC302-7 4.7 V
CHECK PW1, IC952
(BOOST 4.7 V)
HIGH
LOW
IC301-10
(VDD)
HIGH
LOW
IC301-36
CHECK IC302, R3004
(RESET)
HIGH
LOW
IC301-43
(BAT OFF)
HIGH
NO
IC301-40
OSCILLATION
YES
NO
IC301-37
OSCILLATION
YES
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
CLK (96 MHz)
YES
INPUT TO NO OPERATION IF ABSENT
IC102-283 (CLK IN 1) CHECK X1101 OSCILLATOR AND IC111
NO
CLK (36 MHz)
NG
BASIC CPU BLOCK
INPUT TO
CHECK IC102-272
IC101-132 (CLK IN 1)
OK
ALWAYS APPEARS WHEN CPU, ETC. IS ACCESSED
NG
IC101-61 (ZAS)
CHECK IF CPU IS READKING PROGRAM, AND
CHECK ADDRESS AND DATA BUS OF IC121
OK
INCORRECT HANDSHAKING BETWEEN 8-BIT
NG
IC101-118, 119
CPU AND RS-232C
(IRL1, 2)
CHECK EACH INTERFACE
OK
CHECK SOLDERING OF
EACH CPU AND
MEMORY PIN
CHECK IC302
CHECK R3003
CHECK X3001
CHECK X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-55, 45
(SCAN IN 5, 6)
PULSE INPUT
CN301-18, 15
(P ON, P(A) ON)
SERIAL
COMMUNICATION
CHECK CA2
– 18 –
CHECK S3001,
NO
D3012, D3013,
R3038, R3037
YES
LOW
CHECK IC301,
RB302, PW1
HIGH
NG
CHECK
IC301, CA2
OK