Troubleshooting Guide - Sanyo VPC-SX500EX Service Manual

4. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
OFF
MAIN SW
ON
NO
IC301-4 (SCAN IN 0)
PULSE INPUT
YES
LOW
IC302-7 (UNREG)
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)
YES
OSCILLATION
CHECK IC111-9, L1106
NO
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
EACH ASIC AND
MEMORY PIN
NORMAL
MAIN SW ON
CHECK
S3062, R3021
CHECK PW1, CA2
CHECK IC302
CHECK R3052
CHECK X3001
CHECK X3002
MAIN CLOCK FOR SYSTEM OPERATION
NO OPERATION IF ABSENT
CHECK X1101 OSCILLATOR, L1106 AND IC111
TAKING INOPERATIVE
PUSH SUTTER
BUTTON
IC301-2, 3
NO
(SCAN IN 4, 5)
R3026, D3067, D3068
PULSE INPUT
YES
LOW
CN301-7, 8
(P ON, P(A) ON) R3005, R3006, PW1
HIGH
NO
IC301-6, 21, 25
IC301, CA1, PW1
HIGH
YES
NG
SERIAL
COMMUNICATION
OK
CHECK CA1
CHECK R3025,
CHECK IC301,
CHECK
CHECK
IC301, CA1