Question about Onkyo TX-SR304 Receiver

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Reciever malfunctions after 30 mins use

After about 30 minutes of use, the speakers begin to get very scratchy and fuzzy, and create high pitched noises. Also, the display on the receiver will begin to show garbled random numbers and letters (the volume will increase and decrease, but the digital display will show garbage data). Any advice? Thanks in advance!

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Re: Reciever malfunctions after 30 mins use

This receiver runs VERY hot during normal operation. Make sure you provide good ventilation for it.

With summer here, you might consider a small clip-on fan and clip it near the top of the receiver. The amplifier section is along the front of the chassis - so that's the source of heat.

See if unblocking it helps - then try the fan.

Posted on May 15, 2008

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Examine all of your speaker wires carefully to be sure no unintended contact is made between them and anything else.

Is "overload" being displayed?

“OVERLOAD” starts flashing on the display.

Speakers are overloaded because of high volume.

1. Press STANDBY/ON on the front panel to turn off the receiver.
2. Stop the playback source.
3. Turn on the receiver again, and adjust the volume.
Speakers are overloaded because of short circuit of speaker terminals.

Press STANDBY/ON on the front panel, then check the speaker wiring.

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My denon avr1200 receiver once it is turned on goes into Protection mode. How do you reset or make work?

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.

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System shuts off when the volume is moderate to high, now the system shut off and will not turn back on.

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First Unplug the Reciever, let it cool for about 15-30 Min and then
Check all speaker wires to make sure they are in good condition,
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Plug in the reciever, make sure there is nothing on top of it,
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Now push and hold the Reset button on the left side of the front panel
and see if this restores it.

Another thing to try is, get a can of compressed air for computers and
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I do know that they have a high frequency input and a full range input on each speaker.

I am going to guess that maybe you have them connected to the high frequency input.

Are you using 1/4 inch jacks connecting to the input of the speakers?

I don't remember these speakers having a input for wires.

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One thing to check would be the speaker connections. If this receiver worked before you moved it and only started doing this after it was moved, that could be the source of the problem.
If the speakers are connected improperly it could cause it to go into protect mode after a few minutes.
Also check the speaker wires and make sure you don't have any frayed wire sticking out and touching the chassis of the reciever or shorting together.
The phase control symbol is something I would need to research, I have repaired several of these recievers and do not remember the phase control ever being a problem.
Logic would dictate that something is connected wrong, my first thought is the speakers, but it could be something else. I would go back over every single connection on the back of this unit and double and triple check them all. make sure the positive speaker connections are going to the positive speaker post and negative to negative.
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I will be happy to help you further if you need it.

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