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Sharp GF-990G tape decks not working properly


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#1 BertieWooster

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Posted 02 September 2019 - 02:59 PM

I recently obtained this beast. I took a bit of a punt on it, not knowing whether or not it worked. To my surprise, it mostly worked fine. 

 

Attached File  1100229709 (6).jpg   92.7K   1 downloads

 

The synth keyboard, the radio and the speakers all work fine. The only issue is with the tape decks. Initially the right deck didn't work at all, but I managed to free it up and it now does something, at least. Essentially, both decks have the same problem - they play, but the take-up spindles don't turn, so the tape just piles up.

 

There are various screws missing, so someone's had this open in the past. I'm wondering if they didn't configure the belts properly. The problem is, I am an ignoramus and don't know how they should go. 

 

This is how they look at present.

 

Attached File  20190902_173057.jpg   144.45K   2 downloads

 

The motor pulley sits on top of this, near where the 'sharp' logo is, and the big belt - I assume - goes around it. But when I do that, I get the aforementioned problem.

 

I have the diagram from the service manual, but it doesn't mean an awful lot to me, because, as I say, I am an ignoramus.

 

Attached File  diagram.jpg   239.06K   4 downloads

 

If anyone can offer me some advice on how to get this hooked up and working, I'd be very grateful. I'd love to get this machine going.

 

Finally, here's a couple of gratuitous photos of the innards:

 

Attached File  20190902_173238.jpg   120.83K   2 downloads

 

Attached File  20190902_142312.jpg   101.92K   0 downloads

 

Thank you.

 

 



#2 docs

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Posted 03 September 2019 - 01:51 AM

Look for any wheels with tyres on them and give them a clean with a cotton swab.

Also look for the brakes which usually sit on the spindles/reels and stop them turning, make sure when play is pressed that the brakes are raised.

When you turn the flywheel manually you should be able to work out what it is that turns the spindle/reel.

Often there is a mechanical reason but do not discount stuck gears which need removing and old grease clearing up so the gear turns smoothly again.