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Tek 465 Sweep Problem

Discussion in 'Electronic Repair' started by nanu, Oct 29, 2003.

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  1. nanu

    nanu Guest

    Hello Group,

    I have a Tek 465 s/n B3234XX Opt. XB which works perfectly
    except for the following: On the 3 slowest sweep speeds there is no
    apparent trace on the screen. However if I push the beam finder button
    I can see a clear indication of swept trace at the correct speed.
    This is only at the the 3 slowest positions all other sweep speeds
    behave normally. It seems that the trace is being blanked at the 3
    slowest speeds? Anybody ever see this before? BTW I can't seem to find
    my manual, so I may have to buy a new one.

    Thanks
    Gary
     
  2. Jim Yanik

    Jim Yanik Guest


    Some scopes had circuitry to -reduce- trace intensity at slow sweeps to
    prevent burning the CRT phosphor.I can't recall if the 465 had it.(at slow
    sweep speeds,all you have is a slow moving bright spot going across the
    graticule.)

    Can you increase intensity to where you can see the sweep?(without using
    beamfind),Or adjust CRT bias to see it?

    Other than that,you will need to check the sweep blanking circuit
    schematic.

    Not too many people even USE the slowest sweeps speeds. ;-)
    [5sec/div,2sec,1sec.]
     
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