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Yamaha K-500 cassette deck
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mjl1297



Joined: 17 Jun 2006
Posts: 22

PostPosted: Sun Mar 15, 2009 12:30 am    Post subject: Yamaha K-500 cassette deck Reply with quote

I have a Yamaha K-500 cassette deck that has served me faithfully since I was in my early twenties. It is still on active duty in my component system although it doesn't see nearly the use that it once did of course. Indeed I would venture to say my Technics turntable gets more "exercise" than it does.

Anyway it has always functioned flawlessly but the other day I popped one of the few cassettes I still have in it and the motor made a rather disconcerting grinding noise and shut off. There was no mechanical obstruction that I could see so I removed the tape and operated it with the cassette removed. In forward and reverse modes it will only run for a few seconds and then it shuts off. Pressing play it still makes makes the grinding noise and the heads do not engage the tape as far as I can tell.

Anyone have an idea what is going on here? I have found a service manual for it online but I'm hesitant to purchase it as I have concerns about the ready availability of replacement parts which I will doubtless need for it as I'm certain that one of the servomotors is involved here.

Thanks in advance!
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jts1957



Joined: 24 Nov 2008
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Location: Far, Far Away

PostPosted: Sun Mar 15, 2009 11:39 am    Post subject: Reply with quote

Belts?
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PostPosted: Sun Mar 15, 2009 11:17 pm    Post subject: Reply with quote

Would belts cause behaviour like that? I was thinking that the spindles wouldn't even rotate in that case.
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mjl1297



Joined: 17 Jun 2006
Posts: 22

PostPosted: Sun Mar 15, 2009 11:51 pm    Post subject: Reply with quote

Sorry jts1957 but that is my response above. I thought the forum had looged me in when I posted.
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jts1957



Joined: 24 Nov 2008
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PostPosted: Mon Mar 16, 2009 1:38 am    Post subject: Reply with quote

Take a marker and put a dot or line on any guide, pulley, flywheel, idler, etc. that the belt rides on. Then try a mode.
The motor should have a pulley which turns a belt which then moves and turns the next thing in its "path," etc.

For example, if a unit has a motor, a belt and a flywheel ... if the motor pulley spins, but the flywheel does not, either the belt is bad or the flywheel is frozen and can't turn.
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PostPosted: Mon Mar 16, 2009 1:56 am    Post subject: Reply with quote

Ok I'll get it out and open it up tomorrow and do just that. I'll post with an update later.
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mjl1297



Joined: 17 Jun 2006
Posts: 22

PostPosted: Sun Apr 05, 2009 9:31 pm    Post subject: Reply with quote

Finally got around to this. No belts that I can see but they must be there. This machine will run for a bit and then shut off regardless of whether there is a tape inserted or not. Need a service manual I think but no luck there.
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mjl1297



Joined: 17 Jun 2006
Posts: 22

PostPosted: Sun Apr 05, 2009 9:40 pm    Post subject: Reply with quote

Found a service manual to order--give that a try.
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mjl1297



Joined: 17 Jun 2006
Posts: 22

PostPosted: Sun May 03, 2009 4:48 am    Post subject: Reply with quote

Definitely a belt issue as they had all deteriorated into so much goo--nearly impossible to remove. Bought the service manual and it tells me everything but how to replace the belts! Shocked
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jts1957



Joined: 24 Nov 2008
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Location: Far, Far Away

PostPosted: Sun May 03, 2009 5:00 am    Post subject: Reply with quote

Scrape away the majority of "goo" with a small pocket screwdriver. A Q-tip dipped in rubbing alcohol will remove remainder (allow to evaporate - don't allow on good belts).
Once you've completed that, you should have a fairly good idea of how the belts were routed, and probably, what must be disassembled to allow replacement.
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