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Sony EV-S700UB drawer problem

Discussion in 'Electronic Repair' started by Dave D, Sep 8, 2005.

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  1. Dave D

    Dave D Guest

    I have acquired a Sony EV-S700UB 8mm VCR. It came to me with a fault, namely
    the cassette draw often opens on power on, ejecting the tape. On trying to
    close the draw to load a tape, the draw will not go fully home and will not
    latch. Cycling the power a few times and hitting the eject button seems to
    "reset" things and the tape loads successfully, until the next power off or
    sometimes when it feels like it.

    Once a tape loads, the video and audio are fine, and all other functions
    seem to work. Obviously, I don't expect a proper diagnosis based on such a
    flimsy description, but I was hoping maybe this is a common fault with a
    common solution, ie slipping belt etc. I can go in and repair it no problem,
    but a head start would be most beneficial as it's rather complex!

    Thanks in advance

  2. Sounds like some gears could be out of alignment.
    Or it could be a dirty or faulty mode switch.
    ....And some models have ribbon-cables that go bad from flexing too many
    times and must be replaced.
    It may take a careful visual and electrical inspection with a svc manual
    to track down the fault.
  3. Dave D

    Dave D Guest


    Thanks for that. I managed to get it working after a lot of trouble. I
    removed the mode switch, which was a right faff on, saturated it with
    lubricating switch cleaner and rotated it several times. Reassembled, still
    no good.

    I observed the long plastic linkage above the spools which when operating
    seemed to slow down and stop as if jammed, which corresponded withthe fault
    every time. It turned out that the very small motor which operates this part
    of the mechanism (I couldn't even find it for about an hour!) was weak and
    its gears bunged up with crud and old grease. On removing the motor it
    appeared that Sony in their wisdom had applied a blob of grease just above
    the commutator. I removed the grease, flushed the motor with lubricating
    switch cleaner (it has nylon/plastic bearings so it should be OK) and
    reassembled. The linkage moves quickly and smoothly now, and so far the
    fault has not reappeared.

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