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Old 5th February 2011, 06:23 AM   #21
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Dont know if its normal in this amp But theese diodes read shorted when in the board:0.0006 but test fine when out of circuit
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Old 5th February 2011, 06:42 AM   #22
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where are they connected to?
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Old 5th February 2011, 07:04 AM   #23
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Cathode side connects to the IC's next to them and anode side connects to the cathode side of the diodes infront of the outputs, But i tested all outputs the test fine and i removed both ic's and they still test shorted in the board
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Old 5th February 2011, 07:08 AM   #24
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How much current is it drawing?

Did you confirm that you have a clean gate drive signal before replacing the power supply FETs?

Did you try removing the rectifiers?

Have you checked the outputs for leakage?
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Old 5th February 2011, 07:09 AM   #25
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The Stetsom didn't have pulldown resistors. If that's the case with this amp, pulling the ICs could cause the outputs to fail.
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Old 5th February 2011, 07:15 AM   #26
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I dont get any gate signals since the amp wont even power up.

I tested the outputs for leakage and they all test fine.

I removed the rectifiers and still the same thing they test shorted. (diodes)


Amp draws no current at all all i get is a blinking led.

I had the Outputs out of the amp when i pulled the IC's
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Old 5th February 2011, 07:27 AM   #27
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Contact the manufacturer to see if they have an owner's manual and/or a schematic diagram.
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Old 5th February 2011, 07:28 AM   #28
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Im gueessing the IC (2010) in the power supply is defective.

Im also gonna replace the transistors in the supply the legs arent looking the greatest and may break soon.


The drivers are KSP92 IS that that same as a MPSA92 ?

The other transistors are marked C33725 W 7d

Do you have a good part number for thoose?

Talked to them and he told me to send it to him for repair he wont give me any info on the amp
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Old 5th February 2011, 07:32 AM   #29
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Didn't you say that all of the FETs were defective?

Are the legs about to break on the new FETs?

Didn't you determine that the driver IC in the power supply was defective earlier?
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Old 5th February 2011, 07:37 AM   #30
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NO legs are fine on the new fets . The legs are ready to break on the small transistors.

I never replaced the IC as of yet. Guess i should have.


Im gonna put in a parts order right now Just need to know a couple things


The KSP92 transistor is that the same as MPSA92 ?

Also the diodes that read shorted say PH 1N 4148 so are thoose just the regular 1n4148's ?
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