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Tektronix 2445 scope problem

Discussion in 'Troubleshooting and Repair' started by Velliger, Nov 6, 2016.

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  1. Velliger

    Velliger

    10
    1
    Aug 30, 2016
    The readout data is supposed to display at the top and bottom of the crt, namely Delta readings, Ratio, Division/volts, etc. On mine they both display at the right center of the crt. I replaced the A-4 Readout circuit board but no change. Anyone have any suggestions where to look next?
    Velliger
     
  2. shrtrnd

    shrtrnd

    3,734
    478
    Jan 15, 2010
    If you have a manual, or can get one on-line I'd check that first.
    I've seen several people here say that there is a Tektronix forum somewhere on the internet, that you might
    be able to find that will have people specifically familiar with your model and the issue.
    I don't know the problem, and it's difficult to determine from the problem description what might be the trouble.
    Did you get this scope recently and notice the issue, or was it working as you described and suddenly this function changed?
    Is the text on the screen distorted, or clearly visible?
    Is it possible there's a function on the scope that would allow you to move the text, for someone who wants
    to place it specifically in the middle of the screen as opposed to the top and bottom?
    All kinds of questions that I don't know the answers to, but somebody who works primarily Tekt equp would.
    This may just be a Display, Utility, or Menu issue that is easily changed if you know from the manual what to do.
    Good luck, sorry I wasn't much help.
     
  3. Velliger

    Velliger

    10
    1
    Aug 30, 2016
    I have a manual but haven't been able to locate any info on this specific symptom. I'm learning myself. I thank you for your observation.
     
  4. elebish

    elebish

    177
    12
    Aug 16, 2013
    The deflection circuit for the crt works for both the trace and the readouts. Sounds like a horiz scan problem. Check the voltages at the pins on the side of the neck of the crt. Voltages will be high, around 200 to 300 volts dc.
     
  5. Velliger

    Velliger

    10
    1
    Aug 30, 2016
    Hi elebish,
    I appreciate the come back. I have since swapped out the A-2 and A-3 pcbs and it resolved the problem. The fault obviously lies on on of those boards. Will try to isolate it.
    Velliger
     
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