SD-NX10 (serv.man10). Part 7 - Voltage table, Waveforms, Troubleshooting tables, IC tables - Sharp Audio Service Manual (repair manual). Page 7

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If dusts and foreign materials are accumulated on the pickup lens, playback sounds can be skipped or the TOC (Table of Contents)
can't be displayed. Clean the object lens and check the playback. When lens are dirty, do the following.

Turn off the power and wipe lens softly with a cleaning paper and a little cleaning solution so as not to damage it.
Do not touch lens with bare hands.

If the MD unit doesn't start after cleaning the pickup objects lens, check it as follows.

Check as stated in item "disc Loading is not normal".

No

Is disc loading normal ?

Yes

No

Check as stated in item "Playback state cannot be set".

Is playback state set when the MD PLAY/PAUSE button is
pressed ?

Is audio output normal ?

Check as stated in item "Audio playback circuit".

No

Is record and playback operations normal ?

Yes

Check as stated in item "Record and playback operations".

No

Yes

Is it impossible to set both high reflection disc and low
reflection disc to playback state ?

No

Check as stated in item "TEST mode check".

Yes

Only the high reflection disc cannot be played back.

Yes

Is 2.7V to 2.8V applied to the pin 93 of IC1401 with the high
reflection disc inserted ?

Only the low reflection disc cannot be played back.

Is 2.5V to 2.6V (record enabled) or 2.7V to 2.8V (record disabled)
applied to the pin 93 of IC1401 with the low reflection disc inserted ?

No

Yes

Yes

After re adjustment check as stated in item "Normal playback".

Check loading motor PWB, and CW1931.

No

Yes

No

Yes

No

Is audio output waveform observed on the pins 15 and 17 of
CN1501 ?

Check connection between IC1701 and CN1501.

No

Check the main PWB.

Yes

When sound is not output although the playback time display advances during playback in the normal mode.

Is audio output waveform observed on the pins 24 and 26 of
IC1701 ?

Check the pins 70, 71, 72 and 74 of IC1201, and the pins 12, 16,
17, and 19 of IC1701.