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coleman 400 watt power inverter

Discussion in 'Electronic Repair' started by [email protected], Aug 9, 2006.

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  1. Guest

    have a coleman 400 watt power inverter.

    DON'T have a schematic or anything that resembles this circuit.
    is there anyplace I can find this?

    it exploded a 100mf 16v cap.
    has 2 sets of 4 power MOSFETs.
    2 are shorted in the same group on the same side.

    ie --- A1 A2 X X

    B1 B2 B3 B4

    they are STP60NF06

    The cap was across the fan power which apparently came from these
    MOSFETs

    checked what I could - diodes, etc. - other things are at least not
    shorted - could be open

    question is...
    what are the chances that replacing those 2 devices and the cap will
    solve the problem?
     
  2. CJT

    CJT Guest

    Wouldn't a whole new one be cheaper?
     
  3. Guest

    Well, the devices are $1.01 each plus $5.85 shipping, so for $10.00 I
    can replace all 4 devices and fix it -- Unless someone with experience
    thinks there is more problems.
    What can I say, I'm and engineer and don't believe in throwing things
    away.
     
  4. At that price try it and see, but order up some spare MOSFETs in case. The
    other thing to check are the high voltage driver transistor(s). And of
    course for any damage to the PCB/wiring.
     
  5. t.hoehler

    t.hoehler Guest

    Hmmmm, pretty good sig!

    I am in the middle of repairing a UPS that was overloaded and blew out the
    four output fets. It also took out a small portion of board trace. Pretty
    violent. I think I will put a .01 or .05 ohm resistor in series with the
    battery lead when I fire it up after making the repair. I'm not going to
    spend a lot of time fooling with this one, but like you, I hate just
    chucking something if I know it can be repaired.
    regards,
    tom
     
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