Toshiba SD-170EKB2 Service Manual - Page 4

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Toshiba SD-170EKB2 Service Manual
Spindle motor does not move
1.Whether voltage on pin 129 of
U1 varies between 0 and 3.3V
(3.3V for CD and 0V for DVD),
2.Whether peripheral components
are eroded or badly soldered.
Motor no move
Go
Check the FFC connection
between 24P and the loader.
Yes
Check whether "RFA5V"
(+5V) voltage is normal.
Yes
Check whether laser voltage
(2.3V for DVD & 1.9V for CD)
on Collector of Q2 and Q3
Yes
Yes
Have no focus
Yes
Check/Replace the loader
1-1
No
Correct connection
No
Check the
supply
No
Check/Replace Q2 Q3.
No
Check U1 182pin FOCUS_PWM
No
signals
2.If there are F+, F-, T+ and T-
signals output from U7.
FOCUS_PWN waveform

Trouble shooting chart

RFA5V power
Check/ Replace U1.