38
XC-LA21
Check the corresponding
8V power supply.
YES
The Changer broken.
Are the pin 2 of IC5 and
IC6 have 8V supply ?
NO
Is pin 8 of IC6 (VREF) in
5.3V and pin 8 of IC5 (VREF)
in 5.4V ?
Please check
the waveform of pin 3 (OUT-) and
pin 7 (OUT+) of the IC5 and
IC6 ? Is it correct ?
YES
YES
Please check
the waveform of pin 1(RIN)
and pin 9 (FIN) of IC6 and IC5 according
to the corresponding operation?
Is it correct ?
NO
Please check the corres-
ponding resistors R67, R28,
R33 and R68.
YES
Please check the connector
of CN8 and CN6, CN4 and
CD MECHA..
NO
The IC5 or IC6 broken.
NO
3. Can you hear the sound of CD Changer
Mechanism or clamper movement
when power cord plug in
YES
Have noise come out ?
YES
Do pin 12 (VDD) of IC102
have 5V ?
Do pin 6 (TUN-) of IC102
have a 0V ?
YES
YES
Is the waveform
of pin 3, 4 and 5 of IC102
correctly when the tuner is in scan
the frequency ?
NO
Please check the pin 1 of
CN11 in 8V and the corres-
ponding power circuit on
the Tuner board. DZ103,
L102, R177.
NO
Please check the connec-
tion of the pins 3, 4 and 5
of IC102 to IC401.
Please check the pins 1
and 2 of IC102 that have
7.2MHz clock signal.
NO
NO
Do the pin 8 (VCC) of
IC101 have 8V ?
YES
Please check the corres-
ponding power circuit, Q113
and R157.
The connection CN11.
Please check the FE101.
NO
4. Tuner troubleshooting
E
C
B
