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Teac 3-head / 3 motor cassette deck problem

Howdy,

I've got a problem with the motor which runs the head lifting mechanismon a Teac V-770 3 head / 3 motor deck. Circa mid 1980's. Perhapssomeone with experience in this area can point me in the rightdirection. It won't quite fully lift the heads and pinch roller intoplace, and thus the unit won't play or record. If I give the beltdriven wheel a little help with my finger, the mechanism fully liftsand all is fine. Everything moves smoothly, is clean and lubricated,and the belt isn't slipping. The motor is driven by a BA6209 driver ICwhich is powered by 14 vdc. The output of this IC to the motor isexactly 10 vdc. Would anyone know if this is the correct voltage to runthis motor? I don't have a service manual, but I've found a websitewhich can supply one if need be, I was just kinda hoping to find a kindsoul here who knows a thing or two. I'm an electronics guy myself, butnot in this field, so feel free to get technical.

Thanks,
Larry

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Hi Larry,
I have worked on similar units just recently. Three things can be at issue here. 1 is the lubrication of the slide plates of the mechanism, 2 is the belt is loose and this is called a cam belt you can get them from MCM for around a dollar. 3 is a problem I found while working on these decks and that is not that easy to resolve but it can be fixed. I determined in the unit V750 that I was working on that the cam motor made a noise. This motor was taken out to see what was going on and I found that the unit shaft had become sloppy at the rear end where the brushes are due to the front having a brash bearing but the support in the rear was nylon. I then secured with some research a much better motor from an Electronics firm and installed it but it did need new 3mm screws and a little modification of the mounting plate- which can be done with a drill. I mounted this new motor and everything ran perfectly AND the new motor had brass bearings at both sides. Why do I know all this stuff? I am a past Lead Technician in Chicago from Teac corporation and I am still working on deck full time.

Posted on Sep 07, 2012

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Hi Larry

Sounds like you have a drive belt problem. Can you hook a cotton wool bud moistened with alcohol under the best to give it a clean.
You may need to replace the capstan belt to get the deck working. It will also be playing a little slow if the belt is shot. New belts can be purchased as a kit from here for $19.00 plus shipping,

I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :) If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Posted on Jul 27, 2008

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