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Old 31st March 2011, 01:46 AM   #11
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Well that ought to get me some strange looks huh? Pressure washing a circuit board at the car wash!! Its pretty much the whole board. Looking at the schematic you sent me do you really think those resistors could cause audio output issues?? They are linked into a circuit but end up to a ground.
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Old 31st March 2011, 01:50 AM   #12
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I guess I dont understand their function.
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Old 31st March 2011, 01:53 AM   #13
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Yes. I think I remember the same basic part (but 10 ohms) in smaller amps causing one channel to go dead when missing. You could try dropping a 10 ohm resistor in their place temporarily to see if audio returns.
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Old 31st March 2011, 01:55 AM   #14
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OK I have a Punch 200.2 board I found with 4 good ones in it. I will clean the board and drop in the used ones and get back to you. Thanks Perry.
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Old 31st March 2011, 03:18 AM   #15
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Ok Perry I washed the board, all I had was Kaboom so it worked ok but would not get it all off. I dont know what they spilled on it but it was some gunky stuff. I took it out to the shop and hit it with some high power brake clean and that removed all of it and quickly blew it off with compressed air from my compressor. The board looks great, but I think I will let it sit next to the stove overnight just to be safe. That will make sure there is no water in the switches and what not. I blew it off for about 5 min until I saw not even a drop of water anywhere or under anything. I will replace the resistors tomorrow and get back to you. Thanks again..................
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Old 2nd April 2011, 09:19 AM   #16
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Hey Perry replaced all the 5.1 ohm resistors from a donor board. The right channel works sweet and sounds great. The left channel however not so good. Both channels bias fine but the left channel sounds muted and a little staticy, but the bias sets fine. Do you think one of the A56 or A06 smd transistors could have failed or been taken out. The resistors that I replaced in this channel were REALLY burned. I didnt find any open traces, and the output fets seem to test ok with my meter but was wondering if I should view their output through the scope? Its a small group of components so it shouldnt be hard to track down the problem....

Any thoughts????
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Old 2nd April 2011, 10:01 AM   #17
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I do get sound out of the of the left channel when the amp is bridged but it does not output bridged power. It just sounds like a regular 4 ohm stereo output.
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Old 2nd April 2011, 12:59 PM   #18
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Have you checked the operation with the switches and pots in all positions?

If so, drive a sine wave into the amp and set the level so that you have about 20v AC output from each channel. Do this with a speaker connected if the waveform changes with/without a speaker. You'll have to tightly clamp the power transistors to the heatsink if you're going to do this with a speaker load. Post waveforms from each channel. Set the scope so that the waveform deflects 3 divisions and there are 3-4 cycles displayed.
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Old 2nd April 2011, 08:39 PM   #19
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Hello Perry the T-8002 is fixed I found that the trace that runs between the 2 5.1 ohm resistors was broken away from the solder pad where the resistor solders to the board since they run in paralell. Also found a corroded faulty speaker terminal. I stock about 500 of those terminals new because they are always stripped, if you ever need any let me know. Thanks again for all your help......now back to the BD15001
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Old 2nd April 2011, 08:49 PM   #20
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The output looks good and even on the scope with the voltage you posted, this thing puts out some juice, very nice sound. I really like that crossover multiplier.
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