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-   -   Nakamichi MB-75 e-disc error (http://www.diyaudio.com/forums/car-audio/226233-nakamichi-mb-75-e-disc-error.html)

frobek 22nd December 2012 02:08 PM

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?

seankane 23rd December 2012 03:51 AM

The laser pick up could be dirty or out of alignment. Have to you tried cleaning it with one of those discs and solution?

frobek 28th December 2012 04:03 PM

I disassembled the unit and I noticed that the spindle motor doesn't work. Any suggestions?

Mooly 28th December 2012 04:09 PM

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.

frobek 28th December 2012 04:13 PM

Maybe you are right, laser is trying to focus and isn't able to read the CD.

Mooly 28th December 2012 04:16 PM

Can you see the lens performing the focus search routine ? In other words moving up and and down a couple of times.

frobek 28th December 2012 04:42 PM

Yes, it is moving up and down.

Mooly 28th December 2012 05:38 PM

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.

frobek 28th December 2012 06:03 PM

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.

Mooly 28th December 2012 06:29 PM

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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