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Tek 7104 trace

Discussion in 'Electronic Repair' started by Tom Del Rosso, May 27, 2004.

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  1. When a Tek 7104 mainframe has no modules plugged in, should it be
    possible to see a visible trace?
  2. Jim Yanik

    Jim Yanik Guest

    not a trace;no sweep ramp which has to come from a Horiz plug-in,thus no
    beam deflection.(or positioning)

    You can get a spot,though.But you need to turn up the intensity or CRT bias
    for that,as you get no unblanking pulse which also has to come from a Horiz

    7K mainframes were NOT intended to be operated without any plug-ins
  3. In Jim Yanik typed:
    Thanks. I didn't want to run it like that for any length of time --
    just check if the mainframe and CRT were good. So, I take it, there is
    no point in risking damage to the CRT since it wouldn't be a thorough
    test anyway.
  4. Jim Yanik

    Jim Yanik Guest

    If you want to know if the CRT is good,then you *should* use a pair of
    plug-ins;you want to adjust the intensity controls,check for double
    peaking,move the trace around to check for distortions or dead or hot
    spots,which indicate electron gun damage,loose particles inside the
    envelope.I've seen CRTs where you could not get a straight trace,or had
    particles stuck to the phosphor causing halos,dead spots,traces burned into
    the phosphor,etc.Even bad geometry.
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