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7.1 GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 TROUBLE SHOOTING
1. Troubleshooting
Please Plug in POWER cord
YES
Can you hear the
sound of Relay ?
YES
Can you hear the
sound of CD Changer Mechanism
or clamper movement ?
YES
Please press the POWER key to turn the
POWER ON. Adjust the volume level.
YES
Please change to TUNER mode
Is TUNER OK?
YES
Please change to CD mode
Is CD OK?
YES
Please change to AUX mode
Is AUX OK?
YES
OK
2. Cannot hear the sound of relay when
power cord plug in
NO
A
NO
B
pulse input while the power cord plug in ?
NO
C
NO
D
NO
E
A
Is Power Supply of 5V
(pin 8 of CN301) supply ?
Please check the fuse
YES
F306, IC308 and the input
voltage pin of IC302.
Are CLOCK CLT (pin 6 of
CN301) and pin 80 of IC401
high level ?
Please check the corres-
YES
ponding control circuit,
transistor Q301 and Q302.
Is the RES pin
(pin 11 of IC401) has a low
Or the RES pinreturn to high
finally ?
Please check the corres-
ponding reset circuit,
YES
transistor Q401.
Are the XT1 and XT2 (pin 12
and 13 of IC401) oscillated in
32.768kHz ?
Please check the corres-
YES
ponding clock generating
circuit (X401).
And SYS-STOP pin (pin 26
of IC401) should be in 5V.
Are the CF1 and CF2 (pin 15
and 16 of IC401) oscillated in
8MHz ?
Please check the corres-
YES
ponding clock generating
circuit (X402).
The IC401 damaged.
XR-MT3
NO
NO
NO
NO
NO
41
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