Tektronix 7904 Oscilloscope Repair

Discussion in 'General Electronics Chat' started by ELECTRONERD, Mar 30, 2010.

  1. ELECTRONERD

    Thread Starter Senior Member

    May 26, 2009
    1,146
    16
    Hey Everyone,

    While testing an IR receiver with my homebrew PSU, I somehow blew my Tektronix 7904 oscilloscope. All the controls aren't working and every time I turn it on, I get a flagrant odor. When I connected the oscilloscope ground to that of my PSU ground, it shorted the PSU. Therefore, I believe that my PSU isn't "true" ground which resulted in the basis of my oscilloscope problem. At the moment, all I see on the screen is a bright dot, which isn’t adjustable. I “sniffed” out where the odor was coming from, and it’s on the left side near the CRT. I have no idea as to what is specifically causing the problem, and I’m hoping that perhaps any of you can help me find it.

    Complete Manual:
    http://bama.edebris.com/manuals/tek/7904/

    Pictures:
    http://s974.photobucket.com/albums/...&current=Oscilloscope_Tek_7904_Failure007.jpg




    I’d appreciate any help!

    Thanks,

    Austin
     
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