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Old 7th March 2012, 03:07 PM   #21
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Thanks- Q102 and Q104 are indeed connected to the F/L channel....
Third leg of Q102 and middle leg of Q104 are connected to positive F/L channel.

Last edited by Black Frog; 7th March 2012 at 03:10 PM.
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Old 7th March 2012, 03:14 PM   #22
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Nothing from Q102 or Q104 seems to be connected to the negative F/L channel, only to the postive.

What seems weird is that for the F/R channel:
Third leg Q202 and middle leg of Q203 are connected to the NEGATIVE F/R output, and nothing on Q202 or Q203 seems to be going to the pos F/R output.
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Old 9th March 2012, 12:26 AM   #23
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The signal from the output transistors goes to the bridging terminals (L+ and R-).
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Old 12th March 2012, 07:59 PM   #24
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Just reporting back here with update because I am always crabbing at people for not updating problem threads with what fixed the problem or solutions.

I remidied the solder blob problem in the earlier pics. After spending some time poking around with a meter, I could find nothing else out of the ordinary that was obvious.

I buttoned up the amp and re-installed it in my vehicle. Connected only one thing at a time- each time checking for the "Low Ohm" light and any signs of distorted audio. All seemed fine. I left all the trim panels off since then just in I needed to pull the amp again.

So now after five days of use, I have not had any signs of bad behavior from the amp. I'm ready to put all the panels back on and call it good.

My guess is from that really loud extended period of listening when my problem initially popped up, the amp heated to a point where the solder stared to flow a bit. That end of the amp does not have the completely open airflow on the heatsinks in the mounted position, so it would make sense that THAT end would get hotter. Plus it looks like that end of the amp has the higher-powered front L/R outputs vs the lower powered rear L/R outputs.

If the solder started to flow a bit as in the picture and got to a point where the surfaces of the two solder legs juuusssst touched, then I had my problem. It was intermittent for a day or two, then one cold morning it was fine until it heated up.

Been fine for several days- so let's hope it stays that way.
....and I'll behave with the volume a bit.

Thanks Perry!
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Old 13th March 2012, 07:33 AM   #25
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Location: Dona paula, Goa
Some of the solder has cracks due to heat, on long use.
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