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Tektronix CSA802A - anyone familiar with repairing this unit?

Discussion in 'Electronic Design' started by JM, Apr 6, 2013.

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  1. JM

    JM Guest

    I recently bought a CSA802A - a nice clean unit with low up time. Unfortunately it developed a fault in transit, and the extended diagnostics are showing the following faults :-

    Timebase - Block M/F I/F - Comm T3112
    Timebase - Block M/F I/F - Strobe Gate T3311

    I pretty much stripped the whole unit down (I wanted to backup all the EPROMs anyway) and have checked all the supplies and all inter board cabling. All socketed IC's have been checked for correct seating. From a visual inspection there is nothing obvious. The unit was very well packaged, with nodamage to the packaging on receipt, and I'm confident that it was working when sent.

    I thought I'd just post in the off chance that someone is familiar with theunit and can advise on the probable problem. Given that there isn't schematics available for these they are a pain to trouble shoot. I suppose it'll be cheaper in the long run to find a donor unit and swap boards until thefaulty board is identified, rather than reverse engineering the unit.

  2. JM

    JM Guest

    Subject should have referred to the CSA803A ...
  3. JM

    JM Guest

    Yes, on the hardware side two of the plug in slots supply power only, and it has an additional wide bandwidth prescale trigger. The direct trigger has higher sensitivity than the 11801, and has a higher bandwith. Software wise it has some standard inbuilt masks for pass/no-pass testing.
  4. JM

    JM Guest

    Yes, I should have mentioned that I checked all the internal batteries and they are all good (battery backed RAM sitting at over 2.9V).
  5. JM

    JM Guest

    Just for interest here's a photo of the prescale trigger hybrid on the TBC board.

  6. tm

    tm Guest

    Agreed. It's like they killed all the people that knew anything.

    It really is a wonderful scope.
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