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TEK 475 Scope-stopped

Discussion in 'Electronic Repair' started by Dave_s, Mar 28, 2005.

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  1. Dave_s

    Dave_s Guest


    My favorite old TEK 475 Scope has suddenly stopped working.
    Symptoms are:
    No trace, screen is blank, intensity and focus control do nothing.
    Beam Finder shows a dim small circle middle of screen.
    When power is turned off, circle like BEAM FINDER same size is visble
    and bright
    for a breif moment.
    Panel LEDS are lighted and do respond to switches being changed.
    Screen graticule cannot be seen.

    Any suggestions are welcome. I currently do not have an adequate
    service manual,
    just module layout and parts list. I am looking but cannot find the
    scope forum.
    Thanks for any help. Dave_s

    Sounds like power supply issues to me. First and foremost, get a
    proper service manual. Second, use its info to check every electrolytic
    in the power supply section.

    Happy hunting.

    Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
    (Known to some as Bruce Lane, ARS KC7GR,
    kyrrin (a/t) bluefeathertech[d=o=t]calm --
    "If Salvador Dali had owned a computer, would it have been equipped
    with surreal ports?"
  3. tekman

    tekman Guest

    Hi Dave,

    contact me via PM at and I send you a scan of the 475
    serv. manual free.

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