tompeary

CL1 ugly dc offset

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tompeary    0

I have a rush repair on my bench, a CL1 (s/n 002966) out of an aerobics studio. +40 - 55 vdc on bad channel's output, really nasty looking on my 'scope. Any known causes, or is a .pdf of the service manual available?

Thanks!

Tom Peary

Pro Audio Technician

Norman's Electronics

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KGring    0

Tom,

If you are getting a DC measurement on the output, that channels has blown the output stage and damaged the crowbar protection circuit. I can email schematics, but the service manual is only available to authorized service centers through our secure service website.

I have a rush repair on my bench, a CL1 (s/n 002966) out of an aerobics studio. +40 - 55 vdc on bad channel's output, really nasty looking on my 'scope. Any known causes, or is a .pdf of the service manual available?

Thanks!

Tom Peary

Pro Audio Technician

Norman's Electronics

1675[/snapback]

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tompeary    0

I also would think shorted outputs if I got full constant rail on the output. It varies between +40 to +55 volts, the rail voltage is +78. At first, the offset is lower, 4-6 vdc, then, sometimes, the affected channel works fine. I'm thinking diff amp problem. Also, the POWER led doesn't light.

I'll certainly thank you to email me a schematic, board layout would be nice, too.

tompeary@neiusa.com

We were at one time your authorized service center here, but we had a bad manager who blew that for us.

Thanks!

Tom Peary

Norman's Electronics

Tom,

If you are getting a DC measurement on the output, that channels has blown the output stage and damaged the crowbar protection circuit. I can email schematics, but the service manual is only available to authorized service centers through our secure service website.

I have a rush repair on my bench, a CL1 (s/n 002966) out of an aerobics studio. +40 - 55 vdc on bad channel's output, really nasty looking on my 'scope. Any known causes, or is a .pdf of the service manual available?

Thanks!

Tom Peary

Pro Audio Technician

Norman's Electronics

1675[/snapback]

1685[/snapback]

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