Nakamichi MB-75 e-disc error - diyAudio
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Old 22nd December 2012, 02:08 PM   #1
frobek is offline frobek  Poland
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Default Nakamichi MB-75 e-disc error

Hallo,
My Nakamichi MB-75 displays e-disc error message on the display.
I red the service manual, but there is nothing about it.
Have you any experience with it?
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Old 23rd December 2012, 03:51 AM   #2
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The laser pick up could be dirty or out of alignment. Have to you tried cleaning it with one of those discs and solution?
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Old 28th December 2012, 04:03 PM   #3
frobek is offline frobek  Poland
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I disassembled the unit and I noticed that the spindle motor doesn't work. Any suggestions?
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Old 28th December 2012, 04:09 PM   #4
Mooly is offline Mooly  United Kingdom
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Car audio isn't my thing but for CD generally the focus point on the disc has to be found before the spindle motor operates. Its easier to focus on a stationery object rather than a spinning one.

Could be the laser or a problem with the focus search routine.
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Old 28th December 2012, 04:13 PM   #5
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Maybe you are right, laser is trying to focus and isn't able to read the CD.
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Old 28th December 2012, 04:16 PM   #6
Mooly is offline Mooly  United Kingdom
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Can you see the lens performing the focus search routine ? In other words moving up and and down a couple of times.
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Old 28th December 2012, 04:42 PM   #7
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Yes, it is moving up and down.
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Old 28th December 2012, 05:38 PM   #8
Mooly is offline Mooly  United Kingdom
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Next step is to confirm laser is lit. Without a power meter the best you can hope for is a "visual" check (safety warnings apply... don't stare into the beam and don't get to close and on axis to it) and a check of the current consumption of the laser diode but that gets pickup specific.
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Old 28th December 2012, 06:03 PM   #9
frobek is offline frobek  Poland
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Yes, but due to the radio construction it is impossible to run it without the CD, but with CD it's hardly to see anything. Anyway I can't see laser light reflection on the CD. I measured voltage on the laser diode it's ca. 2,2V.
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Old 28th December 2012, 06:29 PM   #10
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The voltage on the diode won't reveal much, its the current thats the important figure. And that brings another problem because laser diodes are very static sensitive although in circuit there is less of a problem.

I understand what you say regarding accessability... I don't know what to suggest tbh. Maybe there are dedicated jigs and extension leads available but that's hardly a diy option.

It may or may not be a faulty pickup and without the detailed checks needed its not possible to say.
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