Troubleshooting Guide - Sanyo VPC-SX 560EX Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
OFF
MAIN SW
ON
NO
IC301-4 (SCAN IN 0)
PULSE INPUT
YES
LOW
IC302-7 (UNREG)
CHECK PW1, CA2
HIGH
LOW
IC301-81
(VDD)
HIGH
LOW
IC301-84
CHECK IC302, R3051
(RESET)
HIGH
LOW
IC301-85
(BAT OFF)
HIGH
NO
IC301-80
OSCILLATION
YES
NO
IC301-82
OSCILLATION
YES
CHECK IC301
NO PICTURE
CLK (114MHz) MAIN CLOCK FOR SYSTEM OPERATION
NO
NO OPERATION IF ABSENT
OSCILLATION
CHECK X1101 OSCILLATOR, L1106 AND IC111
CHECK IC111-9, L1106
YES
SD CLK (57 MHz) SD RAM (IC106, IC107) MOVEMENT CLOCK
NG
OSCILLATION NO READ PROGRAM FROM IC121 IF ABSENT
IC106, 107-38
CHECK IC102, IC106, IC107
OK
INCORRECT HANDSHAKING BETWEEN 8-BIT
NG
IC102-140, 141
CPU AND RS-232C
IC301-75, 76
CHECK EACH INTERFACE
OK
CHECK SOLDERING OF
MEMORY PIN
NORMAL
MAIN SW ON
CHECK
S3062, R3021
CHECK IC302
CHECK R3052
CHECK X3001
CHECK X3002
TAKING INOPERATIVE
PUSH SUTTER
BUTTON
IC301-2, 3
(SCAN IN 4, 5)
PULSE INPUT
CN301-7, 8
(P ON, P(A) ON)
IC301-6, 21, 25
SERIAL
COMMUNICATION
CHECK CA1
– 22 –
NO
CHECK R3025,
R3026, D3067, D3068
YES
LOW
CHECK IC301,
R3005, R3006, PW1
HIGH
NO
CHECK
IC301, CA1, PW1
HIGH
YES
NG
CHECK
IC301, CA1
OK