Troubleshooting Guide - Sanyo VPC-J4 Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
SET THE MAIN
SWITCH TO PLAY
MODE
IC301-56
YES
(SCAN IN0)
PULSE INPUT
NO
NO
IC302-7 4.7 V CHECK ST1, IC955,
(BOOST 4.7 V)
YES
LOW
IC301-33
(VDD)
HIGH
LOW
IC301-9
CHECK IC302, RB302
(RESET)
HIGH
LOW
IC301-13
(BAT OFF)
HIGH
NO
IC301-8
OSCILLATION
YES
NO
IC301-11
OSCILLATION
YES
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
CLK (108 MHz)
NG
NO OPERATION IF ABSENT
INPUT TO
IC111-11 (CLK IN 1) CHECK X1101 OSCILLATOR AND IC111
OK
CLK (48 MHz)
NG
INPUT TO CHECK IC111 etc.
IC111-16 (CLK IN 2)
OK
INCORRECT HANDSHAKING
NG
IC301-37, 38
BETWEEN 8-BIT CPU AND ASIC
(ASIC_SO, ASIC_SI)
CHECK EACH INTERFACE
OK
CHECK CP1, CA1
CHECK S3001
Q9552
CHECK IC302
CHECK RB302
CHECK X3001
CHECK X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-51, 52
(SCAN IN 4, 5)
PULSE INPUT
CN301-34, 35
(P ON, P(A) ON)
SERIAL
COMMUNICATION
CHECK CP1 DMA
BLOCK
– 18 –
NO
CHECK
THE UNIT SWITCH
YES
LOW
CHECK
IC301, ST1
HIGH
NG
CHECK IC301,
CP1 DMA BLOCK
OK