Help with Astec VS3-C3-C8-00 Power Supply

Discussion in 'General Electronics Chat' started by sllsll, Nov 21, 2009.

  1. sllsll

    Thread Starter New Member

    Nov 21, 2009
    2
    0
    Hi,
    I bought a brand new (old stock) Astec VS3-C3-C8-00 power supply.
    I plugged it in.
    Fan comes on.
    All 3 LEDs in front are red for a second.
    Then looks like the AC LED turns green. Two other LEDs remain red.
    (See attached photo)
    I don't have any DC power output.

    I don't know what to do.
    Please help.
    Thank you very much.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
  3. sllsll

    Thread Starter New Member

    Nov 21, 2009
    2
    0
    Thank you SgtWookie for the website.
    No wonder why I could not find Astec website.

    The power supply came with the manual.
    I looked at it and try to understand as much as I could :D

    Actually I have another smaller Astec Power Supply (MP8) model.
    I added an AC power cord; plug it into the wall.
    All lights lid green and all DC outputs have power.

    I thought this new power should do the same.
    Plug it in fan comes on like I said, but not DC output.
    According to the manual Red LED means: output not operating within tolerance. Well, I should I do?

    I'll try to call the support number tomorrow.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    OK, your next step would be to get a schematic and parts listing.

    Preferably, a service manual.

    With no knowledge of how old or what it is, it could be a linear supply or a switching supply.

    Electrolytic capacitors would be the first thing I would suspect; they don't age very gracefully. After sitting on a shelf for prolonged periods, the dielectric "goes away".

    Sometimes, electrolytic capacitors that have not ruptured or leaked their "juice" can have their dielectric layer re-formed, by slowly charging them to their rated voltage via a high-impedance current source. But if power has already been applied, it's likely that the caps are beyond re-forming.
     
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