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Old 4th January 2013, 12:03 AM   #51
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Join Date: Jun 2012
Location: Lexington,Ky
i figured it out. for some reason i missed a step in the repair process.. i forgot the output fets. pulled them all out and tested. all of them were bad. didnt have any visual signs of being bad so i never thought twice to check them during the repair. 6 irf640's later and some sound was produced. so this thing had 8 blown power fets plus gate drivers and 6 output fets shot.

i really apreciate ALL of your help Perry. everything you showed me to test was skewed because of my lack of experience. you helped me more than i thought you would( no offence or anything, just didnt think this thing could be fixed half way through.)my lack of knowledge has made me look like a fool. i wont forget to double check everything again.

you will be hearing from me more often on these forums. thankyou again.
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Old 4th January 2013, 12:09 AM   #52
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Join Date: Nov 2003
Location: Louisiana
It's VERY unlikely that ALL of the outputs were defective. Are you sure that you checked them correctly?

There is still likely a problem with the negative regulator.
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Old 4th January 2013, 01:07 AM   #53
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Join Date: Jun 2012
Location: Lexington,Ky
well i dont know exactualy which ones were bad but the first two i checked were bad and the third was good, so i just replaced all of them.

how would i go about checking the negative regulator? and should i still have the jumper wire on U14, cause i dont. but i have no dc on speaker terminals.

it was verry hard to give you any definite answer on any reading with the amp switching from power to protect so fast. now it idles and does not draw much current. during power up and sound testing with 4 ohm load i only had a 7.5A inline fuse installed that never popped.

Last edited by Kleinteich2; 4th January 2013 at 01:11 AM.
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Old 4th January 2013, 01:54 AM   #54
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Join Date: Nov 2003
Location: Louisiana
Post the voltage on the 7915 again.

Did the relay engage?
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Old 4th January 2013, 02:44 AM   #55
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Join Date: Jun 2012
Location: Lexington,Ky
im not around the amp right now but, yes the relay engaged and "CLICKED". i have allready played some tunes through it. nothin much cause that 7.5amp fuse didnt pop. i can check the 7912 again in the morning for you though.
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