Service manual

MD-R2

– 50 –

• Disc motor fails to run

Check soldering joint and parts of pins 24 and 25 of IC1201, and

peripheral circuit.

Does waveform appear on the pins 24 and 25 of IC1201 in the

TEST mode focus gain coarse adjustment step?

Yes

Does waveform appear on the pins 34 and 35 of IC1601, pins

1 and 2 of CNP1603?

Check soldering joint of PWB of completed IC1601 and CNP1601

disc motor.

Yes

Replace the completed disc motor.

• Tracking servo failure

Does waveform appear on the pins 8 and 9 of IC1601, and pins

1 and 3 of CNS1101 in the TEST mode focus gain adjustment

step?

Yes

Replace the optical pickup.

Check the soldering joint of pins 20 and 21 of IC1201, IC1601,

IC1601, CNS1101.

• Slide servo failure

Yes

Check the waveform on the pins 22 and 23 of IC1201, check the

peripheral parts and soldering joint.

Does the pickup move to external and internal periphery when

the or button is pressed in the TEST mode?

Is there any change on the pins 22 and 23 of IC1201 when the

or button is pressed?

Check the waveform on the pins 22 and 23 of IC1201, check the

peripheral parts and soldering joint.

Yes

Is there any change on the pins 28 and 29 of IC1601, and the

pins 1 and 2 of CNP1602 when the or button is

pressed?

Yes

Does voltage on the positive and negative terminals of slide

motor change when the or button is pressed?

Check the soldering joint of IC1601 and CNP1602.

Check the soldering joint connected to the slide motor to see

whether there is wire breakage.

Yes

Replace the slide motor.