Remove all speaker wires, than start adding one speaker ata time. after every speaker you attach, turn the reciever on, (meaning you attach first speaker than turn it on, if OK turn it off than attach second speaker than turn on).
One of your speaker is cross-over and when you reach this particular speaker, the reciever will turn off with a loud thump. you have to change the pos and neg wires of that speaker.
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This is a protection mode. The receiver protection circuit detects an internal problem like missing power supply voltage or blown channel and shuts down the receiver. You need to bring the unit to a repair facility.
While working it stops and flashes red approximately
2 seconds interval Causes Protection circuit is activated
depending on the temperature of the surroundings Remedy 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 Causes 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 Cause Amplifier circuit has failed Remedy Switch off the power and contact denon
SWITCH OFF THE UNIT..PUSH AND HOLD DOWN BOTH SPEAKER A AND SPEAKER B BUTTON WHILE HOLDING DOWN BUTTONS TURN ON MAIN POWER THE DISPLAY WILL FLASH WAIT FOR 3 FLASHES THEN RELEASE. THIS WILL RETURN EVERYTHING BACK TO RFACTORY DEFAULT
Turn the unit off by main switch (not a standby button). Press and hold "Speakers-A" and "Speakers-B" buttons and turn on main switch. Display blinks. Release the buttons after 3 seconds. Receiver is reseted.
Your receiver is going into protection. The first thing to do is disconnect all speakers at the receiver. Unplug the power cord, then let it set for 30 seconds. Plug it back in and power it on. If it stays on, you have either a wire shorting out at the back of the receiver, something that has pierced the speaker wire en-route to the speaker, a wire touching the other at the speaker or a blown speaker.
Speaker wires should only be trimmed about 1/2" bare at the terminal and make sure you twist the braid so it does not fray. Then connect speakers one at a time, testing the receiver power each time until it either shorts and cuts out, or, you have solved the problem. Hope this helps. If you need more help, post a comment and I can help you some more
Protection circuit turns off the unit because of critical conditions- wrong power supply voltages or one of the power amplifier channels is bad. First, visual inspect the power amp board near the heat sink for burned resistors, test outputs for a short. If there are no problem you may try to turn the unit on and you have several second before it shuts down to check power supply voltages and power amp output voltages and bias, then ... Long story you'd better take it to a repair shop or repair at ebcelectronics.com
Are your speakers able to handle the 886's power. I have the same reciever and changed by speakers as the Denon would turn off instead of frying the speakers.
As for the digital, have you used the option to change your audio feed and video feed. (for example - I'll show photos through the front input but use the CD -digital for music. Maybe the audio feed is locked onto an analog input. Just a suggestion.