I have mine apart presently, parts arrived but I have not had time to
tackle it.
http://divemaster.ca/kubvans/EV1/Controller%20mosfets%20sm.jpg
I have been using this drawing,
http://divemaster.ca/kubvans/EV1/curtis_1221b_schematic.pdf
the output is basically the same as my 1231 hope it helps.
The first device in the chain of mosfets is also different as confirmed
in other posts. Mine has an MTW20N20.
Regarding parts, I found a tube of IXTH50N20 on ebay to do my rebuild I
have been unable to find a source for the diodes. I am planning on
replacing the mosfets removing the damaged diodes. Then testing it under
light load maybe just a resistor load and scope to see if it is working
then make a serious search for a compatible diodes. Some one mentioned
mounting the diodes externally not sure if that would provide the same
protection.
Happy to hear from anyone else that found an available diode or an
external solution.
I found a replacement controller so am not in a hurry to fix it but
would like to have a spare or for a future project.
Note : re-posted to meet Forum requirements regarding attachments.
Thanks for hosting this place for these kinds of conversations.
Peter kubvans.net
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