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Binatone answer machine , model 3900 from 1981

Discussion in 'Electronic Repair' started by N Cook, Mar 3, 2007.

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  1. N Cook

    N Cook Guest

    I know its ancient but the owner does not like the new ones that loose
    contents on power failure, has standard tapes for messages he can archive,
    does not auto rewind to message tape start, 20 minute long messages possible
    etc. No message count is the only down side.
    I've not repaired one for 15 years or so , so i'm rusty.

    It was not responding to anyone dialing in, ie no OGM.
    Of course I try it with telco's "line test facility" and it works fine as
    far as starting OGM and starting record cycle at end of that, so presumably
    an intermittant fault.
    The phone lead and plug are fine but
    I've not fully taken it apart yet. Other than checking for worn belts,
    slippy pulleys, corrosion on manual-change function-switch and change the
    cap that charges up analogue fashion after a pot-settable approx number of
    rings is there anything else to check. ?
  2. Is the owner using it on a properly wired extension - i.e. one that has
    the ring wire connected to pin 3? The machine might not be detecting
    ringing due to a faulty or incorrectly wired extension at the owner's
    premises (which is why it works for you).
  3. N Cook

    N Cook Guest

    there's only 2 wires actively connected to the innards
  4. Unusual for a machine of that age, especially if it's BT approved.
  5. N Cook

    N Cook Guest

    It has one of those green blobs on the back with also a "Post Office
    Certification" sticker but whether they were transfered by Dellboy I've no
    way of knowing
  6. b

    b Guest

    In any device that old, I would start by checking or replacing any
    relays. chances are the contacts have been tarnished with exposure to
    air, arcing or just plain wear and tear. I recently had to clean up a
    few on one of those early 80s sharp 'vz-' vertical turntables.
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