Sharp CP-M1, Руководство по обслуживанию

Страница: 65 / 92

– 65 –
MD-M3/M1
• Disc motor fails to run
No
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
No
Does waveform appear on the pins 34 and 35 of IC1601, pins
1 and 2 of CN1603? Check soldering joint of PWB of completed IC1601 and CN1601 disc
motor.
Yes
Replace the completed disc motor.
• Tracking servo failure
No
Does waveform appear on the pins 8 and 9 of IC1601, and pins
1 and 3 of CN1101 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,
CN1101.
• 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?
No
No
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?
No
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 CN1602.
No
Check the soldering joint connected to the sled motor to see whether
there is wire breakage.
Yes
Replace the sled motor.
• Although the power is turned on, the device does
not turn on.
Pin 76 on ICD01 changes from L to H.
Check between POWER button and pin
22 on ICD01.
When the POWER button is pressed,
pin 22 of ICD01 will change from 5V to
0V.
No
Check between pin 76 on ICD01 and
Q911.
Power relay RL990 turns on.
No
The 5V MDVDD line is powered up. (ZD806
cathode)
Yes
Yes
No
No
Check the power circuit (F999, Q811,
Q812,ZD806 etc)
POWER SUPPLY SECTION