Sony CDP-101 spindle motor - Page 3 - diyAudio
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Old 5th May 2013, 10:52 AM   #21
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Does the frequency meter show anything on pin 23 of IC201 ?
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Old 5th May 2013, 11:25 AM   #22
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on pin23 of IC-201 shows 1Hz. when I unwillingly shorted pin23 with pin24 the motor stops spinning. motor stands still.I have switch off the CDP and whenn I switch on the CDP the motor spins again.
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Old 5th May 2013, 11:46 AM   #23
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That suggests the problem could well be related to the RFCK signal not being present. I'll have to look at the circuit later (haven't got it on this laptop). Try tracing that signal back to its source which I think is another processor.
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Old 5th May 2013, 12:46 PM   #24
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well, I have tryied to wath the signal and RFCK signal is on pin9 of IC-503 there is 0V and 1Hz then goes straight to the pin16 of IC-504 and there is 0V and 1Hz too.
there is one I thing testing connector CNP-27 open with RCFK signal - 0V , 1Hz
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Old 5th May 2013, 12:58 PM   #25
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Its looking like a problem with or around IC503. The master clock is running (you checked with the freq meter). RFCK 1/4 is the signal divided down in frequency by four but the main RFCK is missing to begin with.

Worth checking pins 38 and 39 as its possible a problem there could inhibit something internally within the IC.

In fact its always worth going round any IC and seeing if any other voltages are amiss but its looking a bit like the IC is faulty at the moment.
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Old 6th May 2013, 08:40 PM   #26
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today I have changed complete audio amp board where the IC-503 is located from another CDP which has some different fault (do not read discs, but spindle motor is OK) and the result is OK. motor does not spinns, it is OK so the problem was on the audio amp board.
but I have anotherproblem, CDP does not read the discs as the other CDP. this one was able to read the CDs and now is not. I wonder why, I thouhgt reading (tracking,focusing and moving tray) makes on servo amp board ICs 204,304...
whoaaa it never ends
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Old 7th May 2013, 07:21 AM   #27
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Worth swapping IC503 between boards ?
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Old 7th May 2013, 03:39 PM   #28
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sorry, I dont understand what you mean
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Old 7th May 2013, 04:13 PM   #29
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The laser pick-up connects to the audio amp board, you may have noticed. This is shown on the circuit diagram of the servo amp board as "audio amp board 1/2".

Tracking balance and offset, and focus bias, are adjusted on that section of the audio amp board. They may need re-adjustment for the different pick-up, but you don't have a 'scope.

You could swap the boards back again and swap ic503, but it might be easier to fix the other machine.

Last edited by PlasticIsGood; 7th May 2013 at 04:15 PM.
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Old 7th May 2013, 05:05 PM   #30
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aah, ofcourse Ive got it :-)
the fact ist I am not such a technician as most of you (that is the reason I am asking may be stupid questions for you) and I do not have special equipment. for this kind of IC it is for me risk to swap it.
well, I need to buy some required equipment or new CDP.
anyway, thank you very much for help
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