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JL Audio 1000/1v1 low voltage light
JL Audio 1000/1v1 low voltage light
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Old 17th December 2018, 03:44 AM   #21
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Was Q506 out of the circuit when you read 0,06v?
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Old 17th December 2018, 04:13 AM   #22
mild2wild is offline mild2wild  Trinidad and Tobago
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Join Date: Nov 2014
I don't know if these outputs are just shorting out on me during this process but your question about 506 caused me to revisit it. I discovered it shorted between all 3 legs. I know it wasn't in that condition before. The previous testing had Q504 unpopulated and all others populated. I replaced Q506 and inserted a replacement into Q504 and retested.
Q500/501 5.4v
Q502/503 4.0v
Q504/505 5.3v
Q506/507 4.0v
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Old 17th December 2018, 04:41 AM   #23
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
That looks much better. If you don't see any other problems, reinstall the two capacitors and clamp all FETs and see if it will power up.
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Old 17th December 2018, 07:09 AM   #24
mild2wild is offline mild2wild  Trinidad and Tobago
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Reassembled and it powered up. Getting 115v at the bus bars near the outputs and 58v at the output terminal. Tested for audio at a low level and it is playing clean so far. There was some sparking that came from the ends of the resistors in between the 2 rows of capacitors, the 4R7 and 2R7 resistors, so I resoldered the ends as best as I could reach with the soldering iron. I will order some and change them. Also one of the capacitors next to them appears to have a bulging top so I will change that also. I will still insert an insulator under the green transformer winding.

Is there anything else I need to do to make sure the amplifier is fully repaired and reliable?
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