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Sony Betamax SL-HF750 problem. HELP!

Discussion in 'Electronic Repair' started by rockinnomo, Nov 7, 2007.

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  1. rockinnomo

    rockinnomo Guest

    I have a Sony Betamax SL-HF750 with a problem. This is the model where
    the tape loader is in a drawer that skates out like a CD player does.
    The wormdrive motor starts and stops so the drawer wont come open. No
    foreign objects or broken parts visible under the hood. Any clues for
    how to fix it? My tech and I are baffled.
  2. David Farber

    David Farber Guest

    I had one of these with the same problem many years ago. I gave up on it and
    the customer wound up sending into Sony for repair. I think Sony replaced
    the entire mechanism. As with any mechanical problem, you have to get a
    clear view of the moving parts. With the unit unplugged, try putting a few
    volts dc on the wormdrive motor and take note of where it jams. Then you
    need to disassemble the mechanism until you can see where it is hanging.
    That may involve removing much of the mechanism as I recall. You should also
    consider that there is a good chance that any gear, arm, or other part will
    no longer be available.

    Good luck.
  3. Eric

    Eric Guest

    It may be the tape sensor defective and it can not detect tape is inside.
  4. There is another possibility, though it's unlikely.

    The mechanism presumably has a sensor or switch that detects when the drawer
    is jammed. It's possible the switch is stuck or hanging.
  5. Andy Cuffe

    Andy Cuffe Guest

    There's a switch near the motor which detects whether it's open, or
    closed. Definitely check this. The worm gear can crack where it's
    pressed onto the motor shaft. Check the wiring to the motor and
    sensor switch.
    Andy Cuffe

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