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