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Old 2nd September 2013, 09:31 PM   #21
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HUF75339P3 Fairchild Semiconductor | Mouser

Will these be a sufficient replacement for FET201-204?
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Old 2nd September 2013, 10:06 PM   #22
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Those will work.
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Old 17th October 2013, 05:39 PM   #23
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I replaced the resistors with 390 ohm and replaced FET201-204. Replacing the resistors was interesting - some of the leads were rather burnt and had seprated from the board, but I think everything is okay now, there seems to be a connection where there needs to be. No power, though. Now should I go for the components over the blackened area of the board, such as Q691-Q65?
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Old 18th November 2013, 05:45 PM   #24
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I have replaced the power supply transistors as well as the blown out resistors. No LED, but the power supply transistors get plenty warm. Next, should I replace these?
http://www.bcae1.com/temp/mtx500dregulatordamage01.swf

Does anybody have the schematics for this amp?

Last edited by Chuppster; 18th November 2013 at 05:48 PM.
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Old 18th November 2013, 07:26 PM   #25
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If you pull the rectifiers, does the power supply function without the FETs overheating?
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Old 18th November 2013, 09:12 PM   #26
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I pulled the 2 rectifiers, still no LED. The power supply transistors don't' heat up, though.
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Old 19th November 2013, 11:59 AM   #27
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Is the area around the regulators discolored?

Have you checked the output transistors to confirm that they're not shorted?
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Old 19th November 2013, 08:19 PM   #28
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I'm getting about 28 megaohms between pins 1-3 both ways on each of them. Defiantly not shorted. These are SSP45N20A, FET 101-104. The only discoloration on the board centers around those resistors I replaced.

Last edited by Chuppster; 19th November 2013 at 08:22 PM.
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Old 19th November 2013, 08:25 PM   #29
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What about 1-2 and 2-3?
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Old 19th November 2013, 08:48 PM   #30
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There are no shorts, regardless of polarity.
I seem to have mixed up my rectifiers. What are the model numbers for REC201 and REC202?
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