Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Tim Schwartz
 
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Default Denon AVR-681 help please

Hello all,

I've got a unit here that goes into protection a few seconds after
power up. I've got NOTHING connected to it, and the volume all the way
down. The output transistors all ohm-meter OK. The +/- 45 rail
(approximate) seems OK. ALL 5 channels have about +25V on them, which
explains the protection, and indicates some sort of power supply issue.
Any ideas?

I don't have a schematic or service manual for this unit. Thanks for
your time.

Regards,
Tim Schwartz
Bristol Electronics
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Mark D. Zacharias
 
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"Tim Schwartz" wrote in message
...
Hello all,

I've got a unit here that goes into protection a few seconds after
power up. I've got NOTHING connected to it, and the volume all the way
down. The output transistors all ohm-meter OK. The +/- 45 rail
(approximate) seems OK. ALL 5 channels have about +25V on them, which
explains the protection, and indicates some sort of power supply issue.
Any ideas?

I don't have a schematic or service manual for this unit. Thanks for
your time.

Regards,
Tim Schwartz
Bristol Electronics


These get 1 ohm resistors bad in the regulated power supply area - need to
be changed out for .22 @ 1 watt.

Mark Z.

P.S.
Some models they are R115 and R116, not sure of yours.


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