4-1
Spindle motor does not move
Yes
Yes
No
No
No
No
Yes
Check whether “M5V”
(+5V) voltage is normal.
Correct connection
Check the M5V power supply
Check/Replace Q103,Q104.
Check/ Replace U1.
Check opu focus
1. Check U1 18pin FOCUS_PWM
signals
2. If there are F+, F-, T+ and T-
signals output from U10.
Check/Replace the loader
Yes
Yes
No
Go
Check whether laser voltage
(1.9V for CD & 2.4V for DVD)
on L101(R35) and L102(R32)
Check the FFC connection
between 24P and the loader.
1.Whether voltage on pin14/pin15 of U1
varies between 2.4V and 3.3V
(PIN14=2.4V and PIN15=3.3V for CD;
PIN14=3.3V and PIN15=2.4V for DVD),
2.Whether peripheral components are
eroded or badly soldered.
Trouble shooting chart
Motor no move
FOCUS_PWN waveform