Question about Denon AVR688

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Protector flashing red when off.

My brand new 688 less than 2 weeks old won't turn on. When I hit the stand by button the receiver turns on and then off. I have unplugged all devices and power sources. The unit with nothing attached to it still won't turn on.

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1 Answer

Re: Protector flashing red when off.

If the speaker wires are shorted, it may be in protection mode. Try turning it on with no speakers attached.

If you've already done that and still have the same problem, it's broken and you should return it.

Posted on Aug 06, 2008

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I can't get the receiver button to work on my remote control. I turned it off some how? VSX-1020k

You could try this:
1. Press and hold the R.SETUP, press "4" for three seconds. The LED flashes continuously.
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Power button turns green, flashes and then turns red and flashes.

While working it stops and flashes red approximately 2 seconds interval

Protection circuit is activated depending on the temperature of the surroundings

Switch off the power supply and power on after the temperature have reduced.

While working it stops and flashes red approximately 0.5 seconds interval

1.Using speakers having less impedance than the specified.
2.If speaker core wire touch each other Protection circuit is activated

Even applying power red flashes 0.5 seconds interval

Amplifier circuit has failed

Switch off the power and contact denon service centre

Thank You

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The Denopn avr 688 goes automatically into

The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire2_bing.gif. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers2_bing.gif) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

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I have the same problem with my AVR-688, were you able to find a help?

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This sounds like the amps protector circuit has been activated due to thermal overload. switch it off for an hour or more to let it cool down, make sure your spkrs are connected properly, don't parallel. Try using a fan on the unit to get that heat away. Get a techie friend to give the insides a once over, and clear away any dust that has built up.

hope this is of some help,
Cheers Kimbo.

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'Advaned Surround' will be found in the front panel and 'Return' near the multi-jog dial.


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Mar 20, 2007 | Pioneer VSX-D712 Receiver

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