Turn volume up unit shuts down will not power up again
SOURCE: overload
No, one of your speakers is damaged (could be an amp channel went bad, but speaker is more likely). Unplug all spkrs, then plug one in and see if it acts normal when turned up. Repeat this until all speakers are hooked up or the culprit spkr is found.
SOURCE: Reciever turns off
North American models are all set to 6 ohms. You can't switch the setting.
Try reconnecting the speaker wire into the back of the unit. This worked for me.
SOURCE: Avr Shuts down at high volume
It does that because there is a safety feature in all the newer devices. If your system is turned up to high you would blow your audio outputs or speakers. That's why it shuts off.
SOURCE: Onkyo TX-SR705 shuts down suddenly
Onkyo receivers have a safety circuit in them to protect the Amplifier from blowing up:
If you listen closely when it shuts down ( after a loud scene ) there is likely a loud 'Relay Click'..
If this is what is happening you might be able to verify it by turning the volume all the way 'off' and waiting for the circuit ro reset ( releasing the safety relays & returning power to the internal Amplifier ) : you should hear another click, yhen you can bring the volume back up carefully and there will be sound again.
This safety circuit trips when then Onkyo receiver detects an 'Over Current' condition on the
' Power Supply ' that feeds the internal 'Audio Amplifier'..
Generally caused by:
1.
Improper load presented to the Amp outputs ( FL, LR, RL, RR, SUB, CENTER )
If you can ( one at a time ) turn off the SUB, Center, Fronts and Rears: trying to re-create the failure each time while you have one part of your system disabled or having their level turned way down..
You can isolate where the problem is coming from.
- any or all of these speakers being the wrong Impedence ( I.E. 4 Ohms instead of 8 Ohms )
Unless the receiver manual or the sticker near the 'speaker connetor' specifies a range or another value, you should assume 8 Ohms. Your speakers should say on the back of them.
- any of the speakers being connected in parallel ( 2 speakers to a single one speaker output ) .. Two 8 Ohm speakers connected in parallel make a 4 Ohm load to the amplifier.
- If the Suwoofer is Passive ( Not having its own power cord and amplifer ) it has a
Passive Crossover : this crossover can have its own power rating or limitation.. If it is constructed with capacitors that have too low of a working voltage, then they can saturate and the crossover itself can present a load to the amplifier that will case this 'Over Current Shut-Down'..
You user manual should detail this.
Ed
The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately. Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and reconnect an input and a pair of speaker wires onto the unit. If the receiver still does not turn on than you will have to bring it in for service. Turn up the volume and if the receiver doesn't shut down, power off the receiver and add another pair of speakers. Power up the unit again and turn up the volume. If it doesn't shut down, power off the unit again. Now connect all your input sources and turn on your receiver. If the unit shuts down again, your unit will need to be further serviced at an authorized Onkyo service center.
To obtain service, take or ship your Onkyo product to an Onkyo Authorized Service Center. Please also include in any mailing a contact name, address and telephone number. Please include a copy of the original sales receipt/invoice as well as a letter stating what the problem is, with your name address and phone number so the service center knows who to return the unit to. Please note, before shipping, you must contact the authorized service center to inform them that you will be sending your unit in for repair.
Amps shut down in most cases because the receiver is detecting and impedance (below 4 ohms) that might damage the amplifier. Do a quick check of the speaker connection and look for wires that might be shorted to the frame or have crossed each other. This is the most common cause of the unit shutting down. Check your speakers impedance if you have a meter. If you don't then unplug power from the unit and then un-hook all speaker wires from the receiver. Next connect just one speaker (Front Left) and power the unit back on and take the volume up. If it shuts down then try the Front right all by itself, bring the volume up again. If the unit seems ok then add one speaker at a time and test. Continue until you find the bad speaker/cable. Your amp should be able to drive speakers down to 4 ohms. The NR808 has power monitoring (sometimes called crowbar) that looks for to much current and then shuts down. I suspect you may have a short in a cable or in a speaker. The 808 is a great amp and hopefully your problem is external. If your amp continues to shut down even with just one speaker connected then one or more of your channel amps (internal) is likley bad causing the unit to shut down. Good Luck.
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