Question about Peavey CS® 2000 Amplifier

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No Power to A channel

When switch on the Peavey CS200 the power light on the "A" channel does not come on. The Fan on the same "A" channel revs up very hard and what sound like a relay does not click in. The "B" channel works fine.

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  • 108 Answers

Check output transistors also the driver transistors.

Posted on Jan 23, 2014

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Posted on Jan 02, 2017

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SOURCE: i have a peavey 8.5c power amp channel one led comes as soon as signal is inputed but,no volume out of channel a very weak

One of the preamp IC's may have failed. They used LM3080N and RC4558 IC's- the 4558 you can use any 4558 as they were all high quality lo noise. The LM3080N may still be available from Mouser, i did not check them. NTE may have a replacement, but not likely to be as quiet as the original.

Even with schematic- which they do not have a provision for me to dupload, You would still end up and either buzz test starting from the output transistors and working back OR putting an audio source on the input and using a high impedance old style headphone like they used to use for ham radio (or modern earbuds connected to an impedance matching transformer low impedance winding and the high impedance winding ) you simply attach one lead to ground and then attach a test lead to the other end of the winding and work your way forward until you lose the audio signal.

Outputs of 4558 are pins 1 and 7, and inputs are 2&3 and 5&6 Do not be surprised if one input goes quiet- if both go quiet you are close. The outputs are the more important test point. These are directly in the audio path and most likely for one to have failed.

Posted on Sep 27, 2012

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.

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A bit late, but I'll give it a try.
You can measure the outputsignal before the relay.
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If so, you're power amp is down.
Normally when the relay doesn't switch there's a DC level in your amp.

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