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Tektronix oscilloscope repair tips

Discussion in 'Electronic Repair' started by Jim Lacko, Jan 26, 2006.

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  1. Jim Lacko

    Jim Lacko Guest

    I have an old Tektronix 3347A 100 mHz scope with an control problem.
    Power-up is OK and runs fine for about 5 minutes then all buttons become
    inoperative (all lighted buttons go dark) but CRT display is fine.

    Anyone know of a website with ideas for this scope?

  2. Jim Yanik

    Jim Yanik Guest

    I never heard of a TEK "3347A" o'scope,old or new.

    I suspect you mean "2247A".

    First you need a 2247A SERVICE manual.
    (At least those still had schematics in them!)

    The top PCB is the microprocessor/digital board.
    You may have a thermal problem with some IC on the uP board.
  3. Jim Yanik

    Jim Yanik Guest

    It's also possible that the PS filter caps for the 5 volt supplies have
    degraded and ESR risen.Of course the first circuit checks should always be
    the power supplies;DC voltage,ripple,and regulation.
  4. James Sweet

    James Sweet Guest

    While I'm not familiar with that series, by the description of the
    problem I'd start my search at the power supply.
  5. Bruce Lane

    Bruce Lane Guest

    That's good advice. The second thing I'd do is pull and re-seat
    every single socketed IC. You'd be amazed how many problems result from
    simple pin oxidation.

    Keep the peace(es).
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