Question about Denon DRA-775RD 2 Channels Receiver

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Protection read- out model DRA-775rd older receiver but great!

Small amount of liquid entered though top vents- still operates CD motor-functions but no sound reads out PROTECTION ? can it be saved? old receiver but excellent

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IF it was soda you can save it. Just put in distiled watter and let it dry out for 4-5 days. If you do not have the time to dry take a hair dryer to it not on high though. It need to be compleatly dry befor you plug back in though.

Posted on Jan 20, 2009

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Protection


I just had this same problem and called Denon. I was told to unplug the unit and unplug all attached to it. Then, push both the tuning buttons at the same time (both the up and the down) hold them in while plugging the Denon back to the electrical. Watch the front of the Denon and see 5 cycles flash on the tuner display and then let go of the tuner buttons. Then plug things back in.
That helped the protect thing for minutes. I redid it several times.
No good. One of the channels blew out. I would now get rid of it for parts. I have not had luck with Denon.

May 11, 2013 | Denon DRA-775RD 2 Channels Receiver

Tip

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.





on Mar 02, 2010 | Audio & Video Receivers

1 Answer

Denon DRA 455 cuts out after a couple of minutes on any volume, wired correctly has it finally died or can it be fixed?


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it '*****'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Aug 07, 2011 | Denon DRA-455 Receiver

1 Answer

Denon dra-775rd receiever was working then shut down and now only getting the little red light...nothing else please help if you can thank you


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 15, 2011 | Denon DRA-775RD 2 Channels Receiver

1 Answer

The protection mode want go off from my reciver denon dra 685


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Feb 20, 2011 | Denon DRA-685 Receiver

1 Answer

I have been told that the way I set up my DRA-375RD could damage the receiver. I added a sub-woofer to the one of the speaker outlets. Today, the right side speakers no longer function (both sets of...


Most subs are 4 ohm cabinets. That being said, if you added this to one of the channels alone, fine. If added while another speaker was also connected (A+B mode) and the other was a 4 ohm cab as well, then yes, you probably smoked that channel. The two 4-ohm cabs in parallel like that appear to the amp like a 2-ohm load. This amp is designed for a 4-ohm load minimum. It is likely that the output stage overheated and damaged the output transistors. I would have expected the amp to go into protect mode though. Let the receiver cool down and try again. If it works, then the problem is the low load and removing the sub will "fix" it. If not, then further examination of the output stage will be necessary.

Dan

Jul 15, 2010 | Denon DRA-375RD Receiver

1 Answer

The power supply has burnt out on my denon dra-455 reciver.


It really depends what and how much burn't up? The only way to find out it to take the top cover off and look inside. A lot of parts in the power supply section can only be replaced by excat parts due to safety reasons. And are you certain it's the power supply that's gone up, and not the POWER AMP section? It could be just one part that started smoking. If any semi-conductor has burnt up, you might not be able to read the code number, in which case you will need the service manual.
SO GET LOOKING INSIDE!

Jul 01, 2010 | Denon DRA-455 Receiver

1 Answer

Dra-685 the protection came on ,i found 2 speaker wires together,fixed that,but still stays on,thanks


You may have a speaker that is damaged and causing the protection to operate. Try unhooking all the speaker wiring from the receiver, turn the volume to minimum, and see if the protection still comes on. If the receiver is okay, you can start checking the speakers and wires to determine which one(s) may be responsible.

If the unit continues to go into protection even with no speakers connected, the trouble is inside the receiver. No protection circuit is absolutely perfect, so it's possible something failed before the circuit kicked in. Without the proper test equipment and service information, you won't be able to try fixing this yourself. Take the unit to a shop for an estimate.

Thanks for using Fixya! Hope your receiver's back in service soon.

Feb 02, 2010 | Denon DRA-685 Receiver

1 Answer

Denon DRA 685


Could it be that the speakers load is too much for the amp to handle? What are the ohm ratings? It should handle a low load but I am just wondering? How effcient are they?

Nov 29, 2007 | Denon DRA-685 Receiver

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