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I have an old cs 800 commercial amp side b is dead and side a comes on for a second then goes off. i want to fix it.

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  • Mel Winters Jun 24, 2008

    I repair TVs occasionaly, I do understand about the high voltage capacitors and I know they are being charged, I've checked all the out put transistors Both ways, in and out of the heatsink.

    I pulled side A driver board apart and started checking resistance on ceramic resistors There is one that is less than half it's stated resistance, it powers a set of light weight transistors and i'm thinking it's making one or both of them over heat and completely drop out.

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There are a number of variants to this model. How old is it? Also, do you have any experience with repair work? There measurements that need to be taken inside that can be dangerous. If you can, check for shorted output transistors first. That is the most common failure. ALso, there are some other common problems that I will detail later after looking the specifics up. Please update this with your experience level and we'll attempt to get this working for you.

Dan

Posted on Jun 24, 2008

  • ABRsvcs Jun 24, 2008

    Ok. Thanks for the update. I'll look up the specifics and bring along the service manual as well. There are a few things with these amps that don't appear to make sense. Look for a 2K 5 or 10W resistor and measure that. It may be open. I'll up date this tomorrow.



    Dan

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