Tip & How-To about Audio Players & Recorders

How to keep your receiver out of "protect mode" Part I

"Protect mode" as it is indicated by many manufacturers of modern AV receivers, is a useful safety tool but all too common a problem for many people.

There are various causes of this safety feature to be executed, and returning your unit to normal function will also vary by manufacturer by which you will have to refer to it's manual on the procedure. But the following tips to avoid getting into protect mode apply to all manufacturers of all receiver designs and circuit topology

The number one cause of "protect mode" is heat. Receivers that have Solid State amplifier topology produce a lot of heat. Solid State amplifier topology is the most commonly used design in receivers.
To reduce and dissipate this heat that can cause it to enter protect mode; do one or all of the following:

Remove anything stored on top of the unit. Anything that blocks the vents even temporarily while operating will cause it retain more heat.

Give it room, out in the open. Do not operate it while it is sitting in a cabinet or other enclosure.

Store it farther away from any other source of heat; don't overlook things like desk lamps directed at it, etc. It takes only 1 degree higher than the units' internal temperature sensor setting to shut it down.

If you are operating it in a hot climate, try placing a mini-desk fan directed into the vents.

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2 Answers

Denon AV Receiver Model AVR3600 locked at'' Protection '' mode

The power supply is damaged and needs to be serviced. You have done exactly what you should have to test for an outside issue, it's the receiver.

Nov 02, 2009 | Audio Players & Recorders

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you probly have speaker wires arching. unplug them and replug thm in making sure no bare wire is showing

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There's a fre service manual here, you need to join tte site (free)

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Protect mode with nothing connected indicates an internal problem. Most likely one or more output transistors are shorted. This is a common problem with these and can easily be repaired by a shop for around $35 in parts plus the local labor rate. The output transistors are MN1620 and MP2488 (if memory serves me correctly).


Mar 31, 2008 | Sony STR-DE475 Receiver

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