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Repair of 2 USA "Compass" metal detectors of 1976 and 1978

Discussion in 'Electronic Repair' started by N Cook, Jun 12, 2007.

  1. N Cook

    N Cook Guest

    Is there a frequented metal-detecting usenet group?

    I've been asked to repair 2 old detectors
    The 1976 "Yukon 77B" I've repaired but if anyone knows more about the 2
    National Semiconductor 8 pin DIL custom? chips marked 274 0-004 and 624
    0-001 I would be interested.

    The 1978 "Coin Magnum" seems to be vaguely working in the opposite sense to
    how i'd expect , does anyone one have normal operation guide or any
    technical details before I delve in deeper , at least it uses industry
    standard chippery. Anyone know what the central lump covered in vacuum
    moulded cover is hiding?
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