Troubleshooting Guide - Sanyo VPC-R1E Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
OFF
BARRIER SW
ON
NO
IC301-20 (SCAN IN 0)
PULSE INPUT
YES
LOW
IC302-7 (UNREG)
POWER BLOCK
HIGH
LOW
IC301-53
(VDD)
HIGH
LOW
IC301-19
CHECK IC302, R3054
(RESET)
HIGH
LOW
IC301-31
CHECK IC302, R3053
(BAT OFF)
HIGH
NO
IC301-15
OSCILLATION
YES
NO
IC301-44
OSCILLATION
YES
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
CLK (28.63636MHz)
NO
OSCILLATION NO OPERATION IF ABSENT
CHECK X1102 OSCILLATOR, C1104, C1105
CHECK X1102
YES
SD CLK (57.27 MHz)
SD RAM (IC103) MOVEMENT CLOCK
NG
OSCILLATION
NO READ PROGRAM FROM IC121 IF ABSENT
IC103-38
CHECK IC102, IC103
OK
INCORRECT HANDSHAKING BETWEEN 8-BIT
NG
IC102-237
CPU AND RS-232C
IC301-39, 40
CHECK EACH INTERFACE
OK
CHECK SOLDERING OF
MEMORY PIN
NORMAL
MAIN SW ON
CHECK
BARRIER SW,
RB301, D3007
CHECK
CHECK IC302
CHECK X3001
CHECK X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-20, 21
(SCAN IN 0, 1)
PULSE INPUT
CN301-34
(P ON)
IC102-176
(P(A) ON)
SERIAL
COMMUNICATION
CHECK CP1
– 19 –
NO
CHECK RB301,
D3006, D3007
YES
LOW
CHECK IC301,
POWER BLOCK
HIGH
CHECK, IC301, ASIC
LOW
(IC102), CA-A BLOCK,
POWER BLOCK
HIGH
NG
CHECK
IC301, CA-A BLOCK
OK