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I need to get a HP 54121A Test set repaired. Its trigger input works intermittently

Discussion in 'Troubleshooting and Repair' started by ks1974In, Jun 30, 2018.

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  1. ks1974In

    ks1974In

    4
    0
    Jun 30, 2018
    I need to get a HP 54121A Test set intended for use with a HP 54120A oscilloscope repaired. There is a problem with the Trigger input-It works intermittently. Does anyone know where I can get it repaired? Or failing that, how I can repair it myself?
    Thanks,
    Sagar Kapadia
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,801
    2,435
    Nov 17, 2011
    Is th eintermittent operation linked to anything you do with the equipment, e.g. when you move the connecting cable or the unit? Intermittent operation is often caused by a bad connection or solder joint. A visual inspection plus tapping against any suspect connections may reveal the culprit. Repair should then be obvious. Open the unit and check internal connections, too, including solder joints on the PCB(s).
    Unfortunately there is probably not much more you can do yourself.

    Not me, sorry.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    There is a full service manual available here. You will have to register (kinda) to download it.

    It has everything short of the schematics.
     
  4. ks1974In

    ks1974In

    4
    0
    Jun 30, 2018
    Thanks Harald
     
  5. ks1974In

    ks1974In

    4
    0
    Jun 30, 2018
    Thanks Steve. I downloaded it.
     
  6. ks1974In

    ks1974In

    4
    0
    Jun 30, 2018
    The following link contains a document that appears to have the schematics too
     
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