Nak mb-70 dead ?

[MadMutt]

*Sigh* why do I get all the fun repairs.

Ok, I have a nakamichi mb-70 that 'appears' dead.
It lights up but thats all.
After selecting cdc on headunit, first I get 'no mag' (yes there are no disc's in it) then it gives me 'error'.

Where do I start ?

Unit appears mint and unmolested, no obvious (visual) problems.
I'm guessing a component failure but without any info where oh where do I start ??????????

[niteowl]

Hi MadMutt

Does the Mech make any noises or movements when first powered up? If so then it needs to be realigned. Laser should almost never go either. Tricky little bugger to take apart.

Martin

[MadMutt]

on initial power up it made transport noise for about 2 sec's.
Since then it's been silent.

Yes looks very interesting, LOVE the way it loads by the edges.
Well, when they work at any rate

[MadMutt]

Update;
Looks like the 'shut arm' is 'shut' and won't let anything go any further.
Any tips hints etc.

[niteowl]

It's stuck!
Hard to describe how to repair as there are a bunch of ways it jams up. Try to push the slider (on top) back and forth, it should start the cams rolling and you can put it back into the unloaded position. There is a small brass gear inside the disc shuffle mech that needs to be turned over. When it was punched out, one side has a curve and one flat. The flat should be facing away from the metal. I will try to post a picture later of where it is.

Martin

[MadMutt]

See if I can help here.

Pic from front.

[MadMutt]

And one from top.

[niteowl]

Madmutt

the moderator has failed to post my reply from 2 days ago? on how to fix the deck. It did not contain any questionably language. so I will try again.

Martin

[MadMutt]

Yes.
I know the feeling.

Anyway, I've had a major win.
After 'playing' with those gears you mentioned it started to make some noises.
Not quite fixed but a start.
(couldn't see that brass gear you mentioned though)

I also found that the soldering on a connector (one over in the front corner, has a circuit ribbon that feeds down the side) was a bit suss.
After resoldering that, it sprung to life.
So Yay it works.

Even though it's now working I would still love to hear/see what you are trying to post.

Thanks for all your help.

[niteowl]

The brass gear is under the spot marked in red, deep inside the stacker. Use a microscope to solder the flatwire connector as the solder the factory used is too soft. Make sure the pickup tray is fully to the edge and the tray full down before power up.

Martin