37
XC-LA21
7.1 GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 TROUBLE SHOOTING
Please Plug in POWER cord
Can you hear the
sound of Relay ?
Is TUNER OK?
Please change to TUNER mode
Please check the fuse
F306, IC307 and the input
voltage pin of IC302.
Please press the POWER key to turn the
POWER ON. Adjust the volume level.
YES
NO
Is CD OK?
Can you hear the
sound of CD Changer Mechanism
or clamper movement ?
YES
YES
YES
YES
Please change to CD mode
YES
Is AUX OK?
Please change to AUX mode
YES
OK
YES
The IC401 damaged.
YES
Is Power Supply of 5V
(pin 8 of CN301) supply ?
YES
Are CLOCK CLT (pin 6 of
CN301) and pin 80 of IC401
high level ?
Are the XT1 and XT2 (pin 12
and 13 of IC401) oscillated in
32.768kHz ?
YES
Are the CF1 and CF2 (pin 15
and 16 of IC401) oscillated in
8MHz ?
YES
Is the RES pin
(pin 11 of IC401) has a low
pulse input while the power cord plug in ?
Or the RES pin return to high
finally ?
NO
NO
NO
NO
NO
Please check the corres-
ponding control circuit,
transistor Q301 and Q302.
NO
Please check the corres-
ponding reset circuit,
transistor Q406.
NO
Please check the corres-
ponding clock generating
circuit (X401).
And SYS-STOP pin (pin 26
of IC401) should be in 5V.
NO
Please check the corres-
ponding clock generating
circuit (X402).
NO
1. Troubleshooting
2. Cannot hear the sound of relay when
power cord plug in
A
A
B
C
D
E