20 Most Recent Denon AVR688 Questions & Answers

Hello, Thanks for the phone call.

We learned that you purchased a used denon system for way under its value for a used system.
My indication is you got burned for 150.00 from a dead beat seller.

The unit would need repair first thing to check is the fuse inside, then the transformer to the amp.
This again would cost in repairs.

Since you bought this and it did not work from a ebay seller I feel there maight be more to this problem then meets the eye. Take it back and save the hassle then leave him some negitive feedback for lieing
about its fuctionality.

I would love to give you a refund on your money you paid us, However since I was available to take your call and basically tell you what it is and give you advice, I still leave that up to you.

Thanks for using Fixya.com its been a pleasure waking up and taking your phone call.

Regards,

Rulds2008 Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Having both HDMI and Fiberoptic cables causes conflicts with one another, HDMI carries both video and audio signals HDMI = Best. Hook your PS3 to your audio source with HDMI. then configure it through your PS3

Your receiver may not be able to decode audio from HDMI. It may just act as an HDMI switch. Use a TOS link optical cable for each audio source.

I ran into this yesterday on a customer's unit that was in for repair.Apparently when the headphone jack is removed while the unit is on and A

i guess you want tv sound coming out of you denon.you will need a red and white rca lead. one end into the back of the denon.either LD,AUX,OR VIDEO.then turn the selector on the denon to the input you plugged into.hope this makes sense

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

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 wire. 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 speakers) 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.

Take it back and have it inspected again. If you have 2 weeks I would not waste time trying to solve it your self. If the obvious isn't working it has to be in the circuitry or something is shorting possibly. Make sure to raise a stink about it continuing with the same issue after servicing

It sounds like it might be the overheat protection problem described in this thread. http://www.fixya.com/ThreadView.aspx?prdid=622921&thid=3736114 Your amp has a thermal protection circuit which shuts down the receiver to prevent damage from overheating. Most often this is due to using speakers with an incorrect ohm rating, such as using 4 ohm speakers in a system designed for 6 ohm . It can also occur from using 6 ohm speakers in both the A and B front channels at the same time. If you have speakers attached to both the A and B try removing one set and check if this makes the system stable.

Check the ohm rating of the speaker system you are using against the minimum 6 ohms recommended for your Denon AVR688. If you are using 4 ohm speakers it will overheat the amp. Also, if you are using both the A and B front channels at the same time you must increase the speaker ohms from a minimum of 6 ohms to a minimum of 12 ohms to avoid overheating.

Typically this is because of heat generation. There are protection circuits that will shutdown the receiver when it gets too hot. There are many reasons for this. Can you update this with the make and model please? That will help to determine the possible causes of the heat shutdown.

Thanks,
Dan

If there are any power cords from other components near speaker wires the electric interference transmits through speaker wire causing a buzz.

Try to reset the unit: hold "speaker A" and "Speaker B" buttons and power on the unit. Display will be flashing, release the buttons after 3 seconds. If the problem still there, most likely you have bad digital signal processing (DSP) board - send the unit to repair facility.