Shuts off everytime i turn it up pass 4.

Sounds like the protection circuit is tripping. With power off, check for loose speaker connections. Also, look very closely for shorts in the speaker wires. Even a single loose strand can touch another connection and create a short, which shuts down the receiver.

I would take take the frequency splitter out of the circuit and see what happens. Check for acceptable impedances in the manual. The receiver may not like the load the splitter presents.

The receiver may have settings for bi-amping. Then you use one set of terminals on the back for treble, and a different set for bass.

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.

It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition.This can be due to the fact that the amp does no get sufficient power and so the output is starved to shut down. So please check the mains voltage or use a stabiliser. Also a faulty speaker can make the amp to shut as the outputs drain too much currrent.

Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test for short on the speakers.

Thank you for using Fixya

"Safety" mode - literally? I don't see that anywhere in the manual.

Page 13

Speaker Connection Precautions

(North American and Taiwan models) You can connect speakers with an impedance of between 6 and 16 ohms. If you use speakers with a lower impedance, and use the amplifier at high volume levels for a long period of time, the built-in amp protection circuit may be activated.

Page 66

The STANDBY indicator flashes red

The 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 set the volume to maximum. If the AV receiver stays on, set the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your Onkyo dealer.

Generally speaking, an amp protects 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.

The protection function has been activated because it has sensed an output load problem, turn receiver off and remove the speaker wires, this will reset the protection circuit. Now! turn the device on and turn the volume right down, if the protection mode stays off it indicates a short in the speaker wire or one of the speakers, but! if the protection circuit comes on with "the speakers and wires dis-connected" it means there is a short in the audio outputs in the receiver itself, this can only be rectified by having the parts replaced.

sounds like the protection circuit is the problem here which is a good thing because its stopping you from permantly damaging the unit first thing to check would be the impedance of your speakers and then check what your impedance selector is set to on the back assuming you have one be warned that you should never move this switch while the unit is on.My advice would be to unplug it first because that switch plays a direct role in the systems power supply..Hope this works for you

Protection circuit activating. Possibly a shorted amplifier channel or power supply fault. Take it to a Denon repairer

The reason why your receiver is going in protect is because there is a short circuit happening. This would either be on your speaker wires, speakers or receiver itself. What you want to do to check would be:
1. Unhook all sources and speakers from your receiver.
2. Turn on your receiver and crank up the volume to maximum, if your receiver does not shutdown or go on protect then the receiver is OK. If it does shutdown and go on protect then its an internal problem on the receiver and you would need to send that over to an authorized service center.
3. Hook up a source and 1 speaker. Play something from the source or the fm tuner, Crank Up the volume to about 46 or 47 volume. If the receiver does not shutdown, its good.
4. Hook up a second speaker and repeat the process until you encounter the pop and shut down
if for example you encounter the pop on the 4th speaker, try changing the speaker wires.
5. If the receiver still shuts down then it would be a short on the speaker itself and it would need to go to an authorized service center.

The problem is not with the inputs. This unit is in protect because a problem has been detected in the output section. Try disconnecting the speaker wires and turning it on. If the unit remains on, there is a short in one of the speaker wires. If the unit still shuts down, there is an internal problem that will require repair. It sounds like this is a new piece. If so, it should be covered under warranty.

Keep us posted,
Dan

Hello david 420

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.

cancerags