I've opened it up and found (at least) two MOSFETS blown out right near
the logic board.
Photos and lots of text here:
https://www.summet.com/blog/2017/01/08/curtis-1231c-8601-500a-pwm-dc-motor-controller-teardown/
But I did find something funny...
One MOSFET on the power board (Q13) is different from all the others.
First, it has 3 pins connected to the PCB, while all of the others only
have 2 pins, with the third middle pin soldered to a ring terminal and
connected to the heatsink via the mounting screw. Second, it is a Vishay
IRFP254 instead of an IXTH50N20.
Are there 18 power mosfets (there are 18 freewheeling diodes), and this
one random one that is for something different? Or did somebody replace
one original IXTH50N20 already? (The fact that the PCB for it has 3
holes while all the others have 2 make me think it came from the Curtis
factory this way...)
Is this guy part of the current sense circuitry? If anybody has a
schematic for power or logic board that would be appreciated.
Thanks,
Jay
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