Successful Rebuild Avr for Coleman Gensat

Discussion in 'The Projects Forum' started by Legacy, Aug 17, 2010.

  1. Legacy

    Thread Starter New Member

    Aug 1, 2009
    1
    0
    Here is rebuild of the AVR in a Coleman Powermate 6250.
    It is a follow up of this thread from a few months ago
    http://forum.allaboutcircuits.com/showthread.php?t=18074

    The AVR in this unit is a Rev 7, the differance between this one and
    the Rev 3 in the old thread are Zener D5 is a 1N4739 (9.1 volt)
    S1,S3 MOVs are 10D431 and S2 is a 10D621.

    All Diodes,Transistors,Caps and MOVs were replaced.

    The 1st pic is the bottom of the board after repair it
    was then coated to protect it from moisture.

    The 2nd one is the top of the board after repair and has been
    reencapsulated.

    The generator still didnt work after i had repaired the board
    so I figured the residual magnetism had been wiped out by
    the damage done to the AVR.
    I remagnitize the rotor by hooking a small 12v gel cell battery
    to the brush contact plate. + to outside ring - to inside
    as shown in this last pic. About 2 seconds was all it needed

    The generator is now fully funtional.

    I hope this helps a few people out with their units.
     
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    Last edited: Aug 17, 2010
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