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Yahama MT8X 8 track mixer cassette unit

Hi. I have this 8track casette recorder that, when you put a tape in to play, the tape unit does its' auto stop thing after a couple of seconds.
The cassette unit doesn't have the little finger poking down to measure tape tension - I have no idea how it works.
I've pulled it apart once before and given it a good clean, checked the belts, wheels and cleaned the pinch roller which wanted a bit of fine paper to rough it back up again, and it's still the same.
After a couple of weeks rest, I'm ready to take it on again - what can I be looking out for?
Many thanx and I appreciate you help.

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  • 2 more comments 
  • tru2form Apr 24, 2008

    I and thanx. I checked and didn't see the post you mention. I have a good all round clean from the outside with a compressor on very low pressure just in case yet it is still the same. The casette player runs for about 8 seconds of !click!click!click!click! before cutting out.
    Here are a couple of pics of the inside of the tape mechanism for you to see - the head is extended for the photo - perhaps they will help.
    http://i83.photobucket.com/albums/j302/t...
    http://i83.photobucket.com/albums/j302/t...
    I have ordered a service manual from Canada to help me out on this, yet to arrive.
    Regards,
    tru2form

  • Miha Jan 25, 2013

    Hi, tru2form. I hope you see this. I have the same exact problem as you do with my Yamaha mt8x. Did you find a solution. Please send me your answer. Thanks!

  • Alan B
    Alan B Sep 06, 2013

    I have found the solution to this issue. My friend has the same model and it does the same thing. He found that the motor and belt that run the tape head assembly (not the capstan motor) was slipping. When it slips, the heads never fully extend, and the take up reel skip. to fix this, simply replace the small belt, or use regrip to recondition it so that it does not slip- alan.bradesku@gmail.com

  • Miha Feb 22, 2014

    Alan B, I have just saw this message today and repaired my Yamaha MT8X in 20 minutes. Thank you very much!!!

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  • 319 Answers

I believe this unit employs an optical sensor to detect tape end.
Clean this off to. It looks like a transparent post positioned along the tape path. Reset the counter to zero and fast forward tape to end. Rewind, and try to play tape as normal

Posted on Apr 23, 2008

  • Van Lake Apr 25, 2008

    Judging from the pix you provided, the take-up reel is rotating. However, the (left) supply reel may not have sufficient back tension to keep tape from sagging, thus, activating the shut off sensor. Adjusting the back-tension can be tricky -- too little the tape will cintinue shut-off, too much and it will slow the tape speed

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