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How to remanufacture your Blower powerstage yourself 850

posted by  93 850 GLT on  Wed Aug 22 16:23 CST 2007
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last visit: Mon Aug 27 15:40 CST 2007
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I modified the 220 and hooked it all back up and it seemed to start to work and then went dead. From everything I can tell the transistor has good specs.
55V - 5.3 mOhms - 169 Amps - 330 Watts

I have included a picture of the modification. ( If it worked) I cut off the pins from the old transistor and soldered them to the new one. In principle, it is the same thing you did.

There was a bunch of white gunk under the old transistor that I thought was corrosion from time and heat. Is that incorrect? I cleaned it off. Was that wrong?

The new transistor is screwed directly to the heatsink - metal to metal. that is the only difference I can find.

The link for the complete specs for this transistor is:
http://futurlec.com/Transistors/IRF1405.shtml

I have one more transistor and I'd like to hear from you before I try putting it in. I'd hate to burn them both for the same reason. I know the how of these things, just not the why.

Thanks,
Bryan







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