4-1
Spindle motor does not move
Yes
Yes
No
No
No
No
Yes
Check whether “MO_VCC”
(+5V)
voltage is normal.
Correct connection
Check the MO_VCC power
supply
Check/Replace Q5,Q6,Q7,Q8.
Check/ Replace U20.
Check opu focus
1. Check U20 pin17 FOCUS_PWM
signals
2.If there are F+, F-, T+ and T- signals
output from U2.
Check/Replace the loader
Yes
Yes
No
Go
Check whether laser voltage
(1.9V for CD & 2.4V for DVD)
on L9 and L10
Check the FFC connection
between 24P and the loader.
1.Whether voltage on pin 15of U20
varies between 0 and 3.3V (3.3V for
CD and 0V for DVD),
2.Whether peripheral components
are eroded or badly soldered.
Trouble shooting chart
Motor no move
FOCUS_PWN waveform
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