Can You Hear The Sound Of Cd Changer Mechanism Or Clamper Movement; Tuner Troubleshooting - Pioneer XC-LA21 Service Manual

XC-LA21
3. Can you hear the sound of CD Changer
Mechanism or clamper movement
when power cord plug in
B
Are the pin 2 of IC5 and
IC6 have 8V supply ?
YES
Is pin 8 of IC6 (VREF) in
5.3V and pin 8 of IC5 (VREF)
in 5.4V ?
NO
Please check
the waveform of pin 1(RIN)
and pin 9 (FIN) of IC6 and IC5 according
to the corresponding operation?
Is it correct ?
YES
Please check
the waveform of pin 3 (OUT-) and
pin 7 (OUT+) of the IC5 and
IC6 ? Is it correct ?
YES
The Changer broken.
38
NO
Check the corresponding
8V power supply.
YES
Please check the corres-
ponding resistors R67, R28,
R33 and R68.
NO
Please check the connector
of CN8 and CN6, CN4 and
CD MECHA..
NO
The IC5 or IC6 broken.

4. Tuner troubleshooting

C
Have noise come out ?
YES
Do pin 12 (VDD) of IC102
have 5V ?
YES
Is the waveform
of pin 3, 4 and 5 of IC102
correctly when the tuner is in scan
the frequency ?
YES
Do pin 6 (TUN-) of IC102
have a 0V ?
YES
Do the pin 8 (VCC) of
IC101 have 8V ?
YES
Please check the FE101.
NO
E
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.
NO
Please check the pins 1
and 2 of IC102 that have
7.2MHz clock signal.
NO
Please check the corres-
ponding power circuit, Q113
and R157.
The connection CN11.