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Repairing a DC power supply

Discussion in 'Troubleshooting and Repair' started by jkm89, May 19, 2013.

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  1. jkm89


    May 19, 2013

    I recently purchased a few surplus HP 6266B DC power supplies:,d.cGE
    Some of them work, but others are exhibiting relatively strange behavior. One of them does not work at all, (no voltage is produced), and another one has a voltage, but the voltage increases very slowly. If I turn it up to its highest setting, It takes several minutes to get up to half of its max voltage.

    Has anyone else had a problem like this? I was thinking about changing out some of the capacitors, because I feel like they would be the most likely to fail. Any other ideas?

    Thanks in advance.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I would follow the instructions for troubleshooting the device.

    If that doesn't show anything, start at the secondary of the mains transformer and work forward checking voltages.

    You've got a full schematic and HP gear was generally very well built.

    If it does turn out to be a capacitor problem you may be able to see that when you open it up.
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