Power supply caps, not relay

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Posted by Cuernavaca (A) on November 14, 2015 at 17:05:43

In Reply to: Parasound HCA-1000 problem posted by Cuernavaca on November 6, 2015 at 07:38:22:

I saw a small amount of leakage around the power supply caps, removed the board and saw some major damage to the board, 3 of the 4 caps had leaked and there was a hole right through the board. I had to repair 2 traces, removed the toasted parts and installed new caps. It started right up, no hum and after 30 minutes I adjusted bias. I had wanted to increase the bias(on recommendation from John Curl), at the 10 mv recommendation from Parasound, the heatsinks don't even get lukewarm. One side was easily adjustable, and I increased it to 18mv. The other channel won't adjust past 11mv. Not sure if it's a bad trim pot or bias resistor. In any case, it sounds just fine.

Thomas
"I've never owned a firearm, but I do have an attack parrot!"

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Follow Ups Full Thread

Topic - Parasound HCA-1000 problem - Cuernavaca 07:38:22 11/6/15 (14)

Power supply caps, not relay - Cuernavaca 11/14/1517:05:43 11/14/15 (1)

RE: Power supply caps, not relay - fantja 18:22:47 11/14/15 (0)

RE: Parasound HCA-1000 problem - pictureguy 22:26:39 11/7/15 (0)

Thanks - Cuernavaca 13:06:34 11/6/15 (5)

If Tony is still at Parasound tech support, you'll get good info. /nt\ - Opus 33 1/3 14:21:49 11/6/15 (4)

RE: If Tony is still at Parasound tech support, you'll get good info. /nt\ - fantja 15:44:24 11/6/15 (3)

Must be 6-7 years now. The dressing of a wiring harness pulled - Opus 33 1/3 17:24:10 11/6/15 (2)

RE: Must be 6-7 years now. The dressing of a wiring harness pulled - fantja 07:02:26 11/7/15 (1)

HCA - Inmate51 02:02:48 11/9/15 (0)

RE: Parasound HCA-1000 problem - danlaudionut 12:15:42 11/6/15 (0)

RE: Parasound HCA-1000 problem - fantja 12:12:59 11/6/15 (0)

RE: Parasound HCA-1000 problem - Inmate51 08:34:09 11/6/15 (2)

I left a message, hopefully they will respond, nt - Cuernavaca 09:06:13 11/6/15 (1)

RE: I left a message, hopefully they will respond, nt - 6bq5 09:52:27 11/6/15 (0)

Follow Ups

Power supply caps, not relay - Cuernavaca 11/14/1517:05:43 11/14/15 (1)

RE: Power supply caps, not relay - fantja 18:22:47 11/14/15 (0)

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