Maytag Neptune Schematic

Posted on Feb 7, 2014

This circuit is basically repeated for each of the 3 motor phases. Here is my experience with repairing the motor control board in this washer. The Q5 mosfet blew out on c phase of the motor drive circuit and the 75 ohm resistor labeled J12 driving this mosfet was fried. The repaired washer operated properly until the 7th run which had a larger load than any of the previous

Maytag Neptune Schematic
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runs and then c phase blew out again and this time the damage extended to the zener diode Z1. After this blowout I focused more on checking the motor windings for problems, and tried to find any evidence of the motor wiring harness insulation being pinched or worn thru. Since the blowout occurred during a much heavier load than the previous runs and I couldn`t find any motor or motor wiring problems. I concluded that the Q5 mosfet blowout might have been caused by the breakdown of surge suppression diode D9. This time I replaced diodes D9 & D11, mosfets Q5 & Q6, gate resistor labeled J12, IR2101 high low driver IC3, and the 15 volt zener diode Z1 and added inline fuses between the c phase motor harness wires and the control board. View of board corresponding to the top right section of the schematic below. R1 & R3 are in the center, C39 is above Z1, and R10 & R12 are in the top right corner of the picture.

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