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Old 13th April 2012, 05:45 PM   #1
chipper is offline chipper  United States
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Default RF punch 40i DSM won't power on

Hi, I got this a punch 40i dsm amp I'm having trouble with it. I replaced the power supply devices with irf3205 mosfets. Before replacing them I checked all the BUZ11's output all of them seem to measure normal on diode check. So I went ahead and put in new power supply fets and as soon as I plug in power it puts my power supply into protect. On the bottom of the board near B+ & GND theres a open trace that connects to the B+ terminal. I soldered it and that's when it kept making my power supply go into protect. I'm not sure what's the problem. I checked D4 & D5 and C12. They measure shorted when in circuit but when I unsolder that trace on the bottom those components measure fine. Any help would be great. Thanks
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Old 14th April 2012, 05:04 AM   #2
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Did you change the power supply gate resistors to 47 ohm?

Did you change the drive transistors on the power supply driver board?

When a power supply fails it is best to change all related components, as they could be damaged or leaky.
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Old 14th April 2012, 06:10 AM   #3
chipper is offline chipper  United States
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Never mind I got it to work now. It was a shorted diode near C12. I'm guessing someone reversed the polarity when hooking it up and shorted a diode. None of the BUZ11 out puts where shorted so that saved me some more work...wheww

Also how does this output stage work when it has all BUZ11 N channel mosfets. I thought this would use the typical IRF540 & IRF9540.
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