Troubleshooting - Clarion ADB340MP Service Manual

TROUBLESHOOTING

Failure Major
phenomenon category
no operation no power-up
no sounding
mechanism
operation
Intermediate
category
microcomputer section:
Q621 collector :
no B/U power output
14V output failure
Q621 collector :
normal 14V output
microcomputer :
B/U power : normal
5V output normal
microcomputer :
5V output failure
no function operated
5V output failure
5V output normal
normal operation
5V output failure
IC501 PIN 22 :
0V output normal
Q612 emitter :
8.6V output failure
cassette mechanism :
no operation 5V output failure
Q363 collector :
14V output failure
5V output failure
CD mechanism :
no operation 5V output failure
6V output failure
5V output failure
- 3 -
Minor Failure
category cause
power input failure
B/U power failure
ACC ON failure
microcomputer IC701
failure
microcomputer
oscillation failure
microcomputer reset
failure
Q602 base : microcomputer IC701
failure
Q602 base : POWER ON circuit
failure
IC501 PIN 4 : microcomputer IC701
failure
power amp IC
IC501 failure
AUDIO 8V input power
failure
Q364 2 PIN : microcomputer IC701
failure
cassette 5V input
power failure
Q362 base : cassette 14V input
power failure
Q703 PIN 3 : CD5V input power
failure
IC631 OUT : CD6V input power
failure
Q703 PIN 2 : microcomputer IC701
failure
Check
location
power input circuit
L601, J214, J215
B/U power circuit
Q621, D621
ACC ON circuit
Q661, D662
microcomputer IC701
microcomputer
oscillation circuit F701,
C707 C708
microcomputer reset
pin R781, R794
microcomputer IC701
POWER ON circuit
Q601, Q602
microcomputer IC701
power amp IC IC501
AUDIO8V power
D611, Q612
microcomputer IC701
failure
cassette 5V power
Q363, Q364, Q366,
D363
cassette 14V power
Q361, Q362
CD5V power
Q703, L701, D731
CD6V power
Q631, Q632, IC631
microcomputer IC701
ADB340MP
ADB341MP