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Old 26th March 2011, 03:01 AM   #101
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Should I try this using a sine wave or music?
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Old 26th March 2011, 03:27 AM   #102
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You can use either. Music will be less annoying if you are using a speaker instead of a dummy load.
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Old 26th March 2011, 04:11 AM   #103
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after 30 min on a 4 ohm dummy load playing music it is still producing a clean output. around the corner heatsinks it is running about 110'F and on the straight a ways or along the sides of the amp it's about 100'F. neither of the 2 cooling fans ever turned on (not that i know when they're supposed to). it's about 75'F in the house. my power supply was only dropping to about 12.9v.
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Old 26th March 2011, 02:53 PM   #104
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It doesn't appear that there are any problems. When it blew the last set of outputs that you installed, could you find any reason for it (poorly soldered to the MEHSA insulators, etc)?
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Old 26th March 2011, 03:33 PM   #105
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No. I saw the distortion at the bottom of the output signal at high volume (1 ohm) and then smoke. What do you use to power up and test these huge amps?
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Old 26th March 2011, 03:46 PM   #106
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I rarely work on large amps now. They're simply too much trouble and too time consuming. Just repositioning them is a pain.

When I have to drive them to full power (or at least to high power, some amps are too large to drive to full power), I strap multiple supplies together and sometimes use a battery as well. It's generally not necessary to drive them to full power. If a class D amp works properly driven to clipping into a light load, it's likely OK. Generally, the only problem that causes them to fail when driven into lower loads is when there is insufficient thermal coupling between the transistors and the heatsink.
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Old 26th March 2011, 05:33 PM   #107
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Cool. Ill try it ln my car later.
Thank you so much.
Not only have you saved me money time and time again, I also get a feeling of success and achievment after every repair.
you are the shiznit. (That's a good thing)
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Old 26th March 2011, 09:41 PM   #108
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Tried it in the car... smoke. Doesn't surprise me because of the distortion I saw before. It only lasted about 10 seconds. I hope I turned it off fast enough to save the power supply
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Old 26th March 2011, 09:45 PM   #109
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Confirm that no center leg of any heatsink mounted transistor reads 0 ohms to the heatsink.
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Old 27th March 2011, 02:27 AM   #110
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It appears now that all heatsink mounted fets have shorted, power supply and outputs. Q411,12,13,14,31 center leg is 1 ohm from heatsink. I never replace any of those they were previously replaced by another person.
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