You many have a fraid wire or if you playing the unit to loud and overload the amp this may cause it to go to protect. Also is the the receiver properly vented. If it get to warm the receiver will also go into the protect mode. hope this helps
The problem has nothing to do with the output, the problem sits in the small board with the yellow connectors, there is a dataflow from the frontand the masteboard and te data is interupted at a moment and tha gives "F70 " I repaird alredy some of them by replacing Q1701 and Q 1702 by BD649, (5V stabilizer ) they can have more power, also replace fuse F5 =1At internal resistance my be too large .
Mostly is it a fall down of the 5 volt that gives the F 70
The best solution is resoldering the print but this almost impossible because their may be some intreruptions between the solder and componentside
The board "REP3107G-T " is no longer available;.. Daniël from Belgium
Shouldnt there be a built in circuit breaker that turns the system off when you are overloading it? This is my experience with them - i usually blast the sucker but it just shuts off and works fine on reboot! - Put a fan on it so it doesnt get too hot!
Or keep it simple and find which speaker wire or speaker itself is shorted out. usually your positive wire it touching a negative either at the stereo or speaker connection. unplug 1 speaker at a time but do not play sound very loud. or just disconnect all and add one at a time until error comes back.
Check to see if you put the correct fuse in the receiver, and if it is the correct one, you will need to check the protection circuit because with it being turned up so loud the amp was probably damaged. in most cases with protection circuits you will probably find your problem with an output transister. than check for blown caps.
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That means that the receivers' overload protection circuitry has been engaged. Depending on the number that is also displayed after the alarm message, there are several causes for this. Overheating, running inefficient speakers such as below approximately 85dB/1W/M rating or too loud a volume with demanding source material and last but not least a loose connection of any kind on the rear panel or on any of the devices connected to it. Especially the speaker cable.
The reciever will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. What I would do first is verify that none of the speaker wire connections are loose at the back of the reciever or at each speaker. And verify that none of the wires are making contact with each other. Then label each speaker wire as you remove them from the reciever so you can re-install them correctly. After you have disconnected the speaker wires try unplugging the reciever for 10 to 15 minutes. Most recievers have a self-resetting overload protection switch and this should reset it back to normal. Now try plugging the reciever back in and turn it on without the speaker wires connected. It should be out of protection mode now. If it is still in protection mode verify that there is not a reset switch somewhere on the back of the reciever. If it is not in protection mode now then proceed to connect one speaker set at a time and turn on the reciever to see if it goes into protection mode. If it goes into that mode after connecting a speaker then that speaker is the cause of the problem. If it does not go into the mode after all speakers are connected then try turning the volume up. If it goes into protection mode then there could be an internal short on the amplifier or a incorrect OHM rated speakers connected to reciever. Verify that the speakers are rated the correct OHMS.
THE GOAL HEAR IS TO DETERMINE IF THE INSTALLATION IS CAUSING YOUR PROTECTION FAULT OR IS IT THE RECEIVER ITSELF HAVING INTERNAL DAMAGE. REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION, THEN THE RECEIVER WILL NEED TO BE SERVICED, AS YOU HAVE TOTALLY SIMULATED A BENCHED CONDITION THAT IS TOTALLY INDEPENDENT OF YOUR INSTALLATION. MOST TIMES, THE RECEIVE WILL GO INTO PROTECTION WHEN IT SEES AN EXCESSIVE LOAD WHEN TURNING UP THE VOLUME, WHICH IS USUALLY CAUSED BY TOO MANY SPEAKERS OR DAMAGED SPEAKERS, BUT IF NO SPEAKERS CONNECTED, THEN IT IS USUALLY BECAUSE THE RECEIVER SEES AN EXCESSIVE LOAD DUE TO ITS OUTPUT SECTION BEING DAMAGED. IN ANY CASE, ONCE REPAIRED, YOU MUST CHECK YOUR SPEAKERS FOR BURNED VOICE-COILS, WHICH WILL IMPOSE AN EXCESSIVE LOAD TO THE AMPLIFIER AND CAN CAUSE IT TO FAIL AGAIN. ALSO, BE CAREFUL ABOUT HOW MANY TIMES YOU KEEP TURNING IT ON OR OFF, AS AT LEAST ONE TIME, THE PROTECTION CIRCUIT DID NOT DETECT IT IN TIME AND THAT IS WHY THE FUSE BLEW. ALSO, DO NO REPLACE THE FUSE WITH A LARGER FUSE. YOU DO NOT WANT TO SEE THE POWER SUPPLY ALSO GET DAMAGED, AS THIS WILL DEFINITELY ADD TO THE COST OF THE REPAIR. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V
most of the receivers come with a cooling fan inside see if its working they usually work when you turn the volume up,, if its working that means you are playing it to loud if you lower the volume a little it will play just fine..( if the fan inside is not working thats the reason it goes into protect mode and it means you must have it repaired,, it goes into protect mode to prevent furter damage to the unit or the speakers,,
Protect on any reciever usually means that it has reached its maximum capacity of volume (known as clipping) and at the reciever is now automatically reducing the volume to avoid damage. This some times is triggered if the reciever was used hard and is now damaged so you would need to bring it to a repair shop. Sometimes its caused by a bad wire to the speakers, a short to say. Check all your wiring, make sure its not overheating and getting plenty of air. Some where its recieving a signal telling it to go into protect mode.
It looks like your receiver's high-speed protection circuit is being activated. It is definitively not a fuse. When a fuse pops, you have to physically replace it. When the protection circuit is activated, the speaker output is cut off and the power supply indicator flashes. There are a few reasons why this happens:
1.- Your speaker wire connections are loose. Whether they are banana plugs or bare wire ends, make sure the speaker terminals on the back of your receiver are tight using clockwise turning. 2.- Verify that your speakers have an impedance between 6 and 16 ohms. Your receiver was designed to work with that impedance range. Any impedance lower than 6 ohms will activate the protection circuitry. 3.- The receiver is used at high volume levels over a long period, which results in an extreme temperature rise. Improving the ventilation conditions around the unit might help alleviate the problem.
If after complying with these suggestions, problem is still present, you might need to have the unit checked by a professional for possible circuit failure. Hope this helps. Let me know.
I just picked up a non working AVR 900, there are a total of 4 fuses inside the unit: 2 on the protect board, 6.3A and 8A, and 2 in the middle near the front.
I was told by Denon the following might reset the microprocessor.
1) unplug unit
2) press and hold tuner and video select on front panel
3) plug in while holding buttons
Unit display should flash until you let go of buttons.
Unit stays on you should be ok/ goes back to red- service
They also said:
There are 3 types of protection that will commonly occur with our receivers. This is designed to protect the unit from permanent damage.
1) Thermal Protect = When the unit overheats this will occur, usually if there is not enough air space above and around the unit. There cannot be anything directly on top of the unit and there must be at least 4 inches of airspace above the unit.
2) Overload Protect = Most commonly occurs when a strand or more of copper speaker wire is not securely connected to the speaker terminal and is touching the chassis of the receiver. If the volume is turned higher than 85% this may also occur. If you need to turn the volume higher than this point to get the level you want, you need a more powerful amp.
3) DC Protect = When an amplifier fails this will occur. This will protect dc current from damaging the speakers. When this happens the unit will need to be serviced.
I had a bad 6.3A fuse ? I replaced it and tried to reset. The microprocessor would not reset. I had the exact same results you had.
The chip on the back side of the front IC board was smoking.
Before I attempted the reset I asked Denon if it was worth sending in for repair. The answer was "NO"