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In Reply to: RE: Amp photos posted by Ewalaa on July 22, 2020 at 14:36:37
On the two wiring harnesses from board to board.
From power supply board:
Black: 12.8 VDC
Brown: -13.0 VDC
Red: 116.0 VDC
Orange: Gnd
Yellow: Gnd
Green: -115.6 VDC
Blue: -115.6 VDC
Purple: -115.6 VDC
Primary/Control board:
Green: Gnd
Yellow: -13.0 VDC
Orange: 12.8 VDC and 27.5 VAC
Red: Variable 0.0 - 1.4 VAC - Signal
Brown: 12.0 VDC and 25.4 VAC
Black: -11.4 VDC
Follow Ups:
Voltages sound ok, but surprised they are only using +/- 13 Volts. You have one big advantage, you have a working unit. I would use it for comparative anatomy, make measurements on both and look for differences.
Actually no...the replacement amp was completely different and I sold it several years ago.
Oh well. Good luck on the repair. Inspect carefully, my experience is that about half of problems have visual indications. I know I made a lot of different suggestions about how to diagnose the problem, lots of ways to skin a cat.
Very good suggestions. Thanks for all the help. I'll let you know if I make any progress.
Ewalaa, I think Rivervalley has the right idea. My plate amp,the BASH, has a volume pot and cross over pot that might cost 10 cents They are miniature pots and I sprayed them with contact cleaner and rotated them back and forth for a minute. I would like a better pot in the future but this worked. My friends M K woofer's plate amp had the same cheap volume pot problem and the cleaning did the trick on his sub too. I have looked all over for a plate amp with a decent volume or level control but I don't think they exsist. I would love to be proved wrong as I won't be happy until I can get a better volume/ level control in mine...Mark Korda.
I gave them a good dose of contact cleaner. No luck.
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