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Old 26th October 2008, 07:55 AM   #1
kkyee is offline kkyee  Hong Kong
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Question PS Audio 200C Power Amplifier

My power amp has noise coming out and DC volt output. Can someone circut graph for me to look?
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Old 31st October 2008, 05:34 AM   #2
clm811 is offline clm811  United States
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Hi Kkyee,

The amp is over 20 years old, so the on-board electrolytic caps
are probably leaky and need to be replaced.

I would replace those and check the main PS cap bank as well.

The adjustment for DC offset is the trimpot nearest the input jack,
while bias trim is the one near the center of the board.

With good caps, assuming your preamp has no dc coming out, you should be able to adjust the offset with the trimpot.

If not, then I suspect the input transistors may need replacing with a carefully matched pair.

If you need additional assistance, you may wish to contact Rick at Cullen Circuits. I understand that he does service and mods for PS audio products.


Cullen Circuits
2323 Tuley Road
Paso Robles, CA 93446
Tel: 805-237-2113
http://www.cullencircuits.com/


I've attached the only schematic I have, which I believe is for the 200cx.

Good luck with your amp!

-chas
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File Type: gif 200cx.gif (20.4 KB, 453 views)
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Old 2nd November 2008, 02:35 AM   #3
clm811 is offline clm811  United States
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Default Found it!

Kkyee!

I found a hand-drawn original schematic of the 200C, attached.

Hope this helps.

-chas
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File Type: jpg 200c orig.jpg (94.3 KB, 366 views)
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Old 11th November 2008, 02:08 PM   #4
kkyee is offline kkyee  Hong Kong
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I don't understand the part of the schematic. refering to the "NPD 5566" The one that is cicled, why is it going into the input from dc servo? between a 10k and the output from the servo. I've changed all the parts already, but at the speaker output, there is also a dc volt out from 0 to 56volts, advancing slowly. Why is this happening? I can't tune the off-set adjust to 0 volt. Thank You

-kkyee
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Old 12th November 2008, 06:47 AM   #5
clm811 is offline clm811  United States
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Not sure. I believe mine doesn't have the servo board.
If you need troubleshooting assistance, you may wish to contact Rick at Cullen Circuits (see above).
Good luck with your project.
-chas
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