Sanyo VPC-AZ1, Service Manual

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5. TROUBLESHOOTING GUIDE
POWER LOSS INOPERTIVE
PUSH MAIN SW
IC301-46 (SCAN IN 5)
PULSE INPUT
CHECK
S3002, R3055
IC302-7 (UNREG)
CHECK PW1, IC303
IC301-10
(VDD)
IC301-36
(RESET)
CHECK IC302
CHECK IC302, R3006
IC301-43
(BAT OFF)
CHECK R3007
IC301-40
OSCILLATION
CHECK X3001
IC301-37
OSCILLATION
CHECK X3002
CHECK IC301
PUSH SHUTTER
BUTTON
IC301-53, 46
(SCAN IN 4, 5)
PULSE INPUT
CHECK R3054,
R3055, D3012
CN301-5, 6
(P ON, P(A) ON)
CHECK IC301,
R3023, R3024, PW1
SERIAL
COMMUNICATION
CHECK
IC301, CA2
CHECK CA2
TAKING INOPERATIVE
LOW
NO
LOW
LOW
LOW
NO
NO
YES
HIGH
HIGH
HIGH
HIGH
YES
YES
YES
HIGH
OK
NO
LOW
NG
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
NO OPERATION IF ABSENT
CHECK X1101 OSCILLATOR AND IC111 CLK (96 MHz)
INPUT TO
IC102-283 (CLK IN 1)
CLK (36 MHz)
INPUT TO
IC101-132 (CLK IN 1)
BASIC CPU BLOCK
CHECK IC102-272
IC101-61 (ZAS)
ALWAYS APPEARS WHEN CPU, ETC. IS ACCESSED
CHECK IF CPU IS READKING PROGRAM, AND
CHECK ADDRESS AND DATA BUS OF IC121
IC101-118, 119
(IRL1, 2)
CHECK SOLDERING OF
EACH CPU AND
MEMORY PIN
INCORRECT HANDSHAKING BETWEEN 8-BIT
CPU AND RS-232C
CHECK EACH INTERFACE
NO
OK
OK
OK
NG
NG
NG
YES