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Yamaha k-720 cassette deck

Will not work/play tape

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Re: yamaha k-720 cassette deck

No play but fast forward and reverse work ok--yes it is the drive belt. I disassembled the unit to find that the belt is actually sticky and stuck to both weighted flywheels, the drive motor pulley and managed to stick to itself. The drive motor is warm from trying to turn. Now, anyone know where to find the belt??

Posted on Jun 04, 2010

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Re: yamaha k-720 cassette deck

This unit may have a tape tension sensor. If that sensor isn't working properly, the mechanism always thinks the tape has reached the end during play/record. Sitting unused could allow some grease on the sensor mechanism to harden which would disable it.

The sensor probably isn't used during FF/REW.

Posted on Mar 21, 2008

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Stop Paying .. ????

if the take up side gets stuck it could feed excess tape and stop the mechanism. Look to see if both reels are turning when you push play. Remove cassette door for a better view if possible.

Make sure your tapes have NO slack in them. Fast forward and rewind one cassette all the way, then try again looking to see if both sides are turning. If not, you may have a belt that is old, stretched and slipping or it's split apart or just fallen off

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Determine the conditions present whenever the hum is present:

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"Tape" selected at the receiver?
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Yamaha K-720 cassette deck will not play tape--immediately stops on auto-stop (or, perhaps, auto-reverse.) Fast-foward and fast-rewind are okay. Had this same problem repaired in the 1980s. How do I...

your problem is the flat belt that drives the 2 capstans. I asked you to check switches but remembered afterwards there is a different motor for fast forward reverse. When the machine is powered on, the capstan motor runs all the time. I bet the 2 capstans are not turning. You can see this if you slide up (gently) the cassette tinted cover. You need a new belt. If you are handy, you can do it yourself (about 2 hours) but it is tricky as you have to remove the complete cassette mechanism and then partially dismantle it to put on the new belt. If you need help I can probably guide you a bit. I just did it a few months ago. The belt size is 9.6 inches. One part number is FBM9.6 or you can try Yamaha service.

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if the heads are getting jammed in the up position it may be a failing capstan belt in the transport not disengaging the transport properly. replace the capstan belt. If one has failed both will probably be bad.

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