QT-CD180 (serv.man5). Part 3 - Waveforms, Troubleshooting tables, IC tables - Sharp Audio Service Manual (repair manual). Page 6

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Yes

Yes

Is following sled feed signal output the pin 71 (FMO) of IC802
when FF/REW key is pressed after the CD TEST MODE is
seted ?

Is sled feed signal output the pins 10 and 11 of IC803 ?

Is sled feed voltage applied between both terminals of sled
motor ?

No

Check the peripheral parts of IC803. If OK, IC803 is faulty.

No

IC802 is faulty.

Check the BI803/CNS803.

No

Yes

Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.

Yes

Is following sled signal output the pin 71 (FMO) of IC802
during playback ?

Normal.

No

IC802 is faulty.

Yes

Is following sled feed signal input the pins 12 and 13 of IC803
when FF/REW key is pressed after the CD TEST MODE is
seted ?

Check the PWB pattern between pin 71 of IC802 and pins 12 and
13 of IC803.

No

FMO

FF

REW

SL

FF

REW

FMO