powerbass asa 2000.1D no output. - diyAudio
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Old 18th April 2014, 12:09 PM   #1
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Join Date: Apr 2011
Location: Anchorage AK
Default powerbass asa 2000.1D no output.

okay here is the back-story:
i bought this amp off ebay, and found the rail caps and power supply blown. output section appeared okay, but i just tested the outputs, etc. replaced caps and power fets/gate resistors, cleaned up, etc, and powered it up. no protect, rails charged up, etc (can't remember exact voltage, but i can re-check) well, it has no output, so i checked around and found some damage on the driver board. i don't have a schematic, so if someone does, that would be great, thanks. anyways, this is what i found:

q110 and q111: ST2N ?551, st show physical signs of being blown
R176 burned
r183 burned

on main board, i found c340 is a 100uf, 100v, which is not original, and i believe it is supposed to be the same as c339, which is 220uf, 100v, based off pics from the other thread by Dr Zeus. may not be important, but i'm not sure of it's purpose. I'm going to test the rest of the driver board components shortly, just figured i would get a jump start.
thank you, -Heath H-
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Old 18th April 2014, 01:00 PM   #2
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Join Date: Nov 2003
Location: Louisiana

R173 = 560 ohms
R176 = 100 ohms
R183 = 10 ohms

I don't know about the 2000 but the 1000 and 1500 have a problem with breaking the legs of the heatsink mounted components. IF you want it to be reliable long term (assuming this wasn't addressed by the manufacturer), you'll need to make supports that sandwich the circuit board between the heatsink and the bottom cover.

Last edited by Perry Babin; 18th April 2014 at 01:02 PM.
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Old 18th April 2014, 03:07 PM   #3
diyAudio Member
Join Date: Apr 2011
Location: Anchorage AK
thanks, i will have to take that into consideration. do you happen to know that the q110/111 do, or why they have popped like that? like i said, i did a quick check on all the outputs, as usual and they seem to be non-problematic at idle/turn-on, but i want to be prepared so that they do not fail again.
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Old 18th April 2014, 03:11 PM   #4
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Join Date: Nov 2003
Location: Louisiana
email me

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Old 12th June 2014, 11:32 AM   #5
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Join Date: May 2013
hi, I have a different problem, basically I would need the wiring diagram, anyone have it? I contacted the PowerBass without answers ...
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