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XR-MT3V
(3) Can you hear the sound of CD Changer Mechanism or clamper movement when power cord plug in
B
(4) Tuner troubleshooting
C
Does pin 3 of IC1302 and pin4 of IC1301 have 6.5V supply ?
NO
Does noise come out ?
NO
E
YES
Check the corresponding 8V power supply.
YES
Is pin 6 of IC1302 (VREF) in 5.3V NO
YES
Does pin 12 (VDD) of IC102 have 5V ?
NO
Please check the corresponding resistors R1341 and R1342.
YES
Please check the pin 1 of CN11 in 8V and the corresponding power circuit on the Tuner board. DZ103, L102, R177.
Please check the waveform of pin 5(RIN) NO and pin 4 (FIN) of IC1302 according to the corresponding operation? Is it correct ? Please check the connector of CN1201 and CN1302, YES CN1303 and CD MECHA..
Is the waveform of pin 3, 4 and 5 of IC102 correct when the tuner scans the frequency ?
NO
YES Please check the waveform of pin 1 (OUT-) and NO pin 7 (OUT+) of the IC1302? Is it correct ? The IC1302 is broken. YES
Please check the connection of the pins 3, 4 and 5 of IC102 to IC401.
Does pin 6 (TUN-) of IC102 have a 0V ?
NO
YES
Please check the pins 1 and 2 of IC102 that have 7.2MHz clock signal.
The Changer is broken.
Does pin 8 (VCC) of IC101 have 8V ? YES
NO
Please check the corresponding power circuit, Q113 and R157. The connection CN11.
