Question about Onkyo TX-DS747

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A speaker button keeps turning the speakers off & on & B doesn't work at all.

Checked all wires to make sure they weren't touching anything that would cause them to have a short.

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This seems to be a common problem with this model Onkyo. I have seen a lot of these, It seems like the 22volt power supply is acting up. either bad connections or capacitors. You will need the schematic and a large swear jar with tons of quarters.

Posted on Sep 10, 2014

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  • 117 Answers

Clean A &B pushing buttons.

Posted on Mar 30, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 3130 Answers

SOURCE: no surround sound

So your saying that you have no rear channel. Some recivers use a single stereo output ic for both sides on the rear speakers. you could have a defect with this IC . Anther thing Im sure you check3ed the obvious ie : the switch is on suround sound? If there is a front to rear fader is it in the middle? Good Luck

Posted on Jun 04, 2006

The Marv
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SOURCE: Crossed speaker wires...did I destroy my amp?

Most likely what you did was burn out the output transistors to the center channel. and probably the Bias resistors that control them. The parts themselves would be inexpensive. But they would probably have to come straight from Onkyo. And you would have to know there part number. And to get matched complimentaries. Mark up. And how far into the circuit the damage went. If I was to repair it I would probably put $100 to $125. But depending on the age of the unit and what a new won would cost is what I would use to decide to replace or restore.

Posted on Jan 16, 2007

SOURCE: onkyo receiver question

One of the speaker maybe are in bad conditions and that burn out the audio amplifier IC you need to change it or send the device to a repair center.Good luck

Posted on Jun 17, 2008

  • 154 Answers

SOURCE: left side speakers only one working

Have you reset the settings in the system to 5.1?Are the rest of the speakers working? Go over the wireing yourself just unplug one at a time and reseat it on both ends system end and speaker end it may just be that when he put it together again one of the wires wasn't set back just right.

Posted on Jul 25, 2008

  • 1148 Answers

SOURCE: Righ & Left Front speakers not functioning


Posted on May 15, 2009

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Car Audio

Swap wires between speakers and to make sure it is not the amp, the head unit or wiring. If the right speaker still doesn't work touch a 9v battery to the speaker terminals for a second to verify if the speaker is good or bad (a pop the speaker is working nothing the speaker is bad)replace. Otherwise check the wiring between the amp and the head unit. If all the wiring is good you may have a bad channel in your amp(bad internal connection or bad component(s)) or last there could be a bad channel output on your head unit. If that is your only right speaker and you don't have one in the door and you use an ipod as a source check the cord!

Jul 04, 2013 | Car Audio & Video

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My denon avr391 just keeps flashing red when trying to turn on. I always have to do a rest but it pops then flashes red again

I had the exact same issue with my AVR-391 and tried resetting per user manual but did not help.
I unplugged all speaker wires from both ends (I only had two), made sure they weren't damaged and/or had loose strands that could have been touching the other terminals or anything else then connected them back. I also cleared the receiver of all stuff that was sitting on top of it (pic frames, remotes etc). Turned it back on and problem has not come back. That was a month ago.

Jan 15, 2012 | Denon Audio Players & Recorders

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Just installed the deck and it works but there isnt any sound

Assuming you have checked the obvious mute button, all aftermarket decks have a ground fault system integrated. If one of the leads to the speaker wires is touching ground, then it will shut off all outputs to the speakers. This is easily checked with a volt meter or a speaker itself, whichever is more readily available. Disconnect all wiring for the speakers you just hooked up and simply hook up only one speaker to any of the sound outputs. Do not let the other leads touch anything. Turn on the radio and if it works, you need to chase a speaker wire that is touching ground, plug in one at a time and go from there.

Jul 17, 2011 | Kenwood KVT-514 Car DVD Player

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I recently installed a new driver side dash speaker in my car. My old one went out, and after replacing the speaker, it worked the first time I checked it, and not the next time when I turned the car on....

The speaker either may not be wired properly make sure that you have taped off the speaker wires individually (where they were cut) otherwise it will short out the signal preventing the speaker from working if they touch anything (even each other). The offset is caused by improper power readings coming from what ever you had plugged it in to house outlets give off different readings than a normal car battery would. If it still doesn't work you may have to replace it. you should contact your vehicle manufacture for more info on how to do that.

May 15, 2011 | Car Audio & Video

1 Answer

Sub box is not working ,amp has power no idea what to check next, ground wire is secure and is good

You should double check your connection to the sub. Make sure that no speaker wires are touching each other. Sometimes you won't get anything to work if pieces of the frayed bare wire on the positive cable are touching parts of the negative.
Is this a dual or single voice coil speaker? or to re-phrase it, does it have one or two speaker terminals?
I would also check your line in to the amp. Make sure it is sending a signal to the amp. If available connect the audio signal to some other component like a boombox or AV Receiver that has a proper connection.

Mar 08, 2011 | Cadence ZXW122 Car Speaker

1 Answer

When you turn player on: Screen said "Hello" , then "Protection"

Sounds simple... usually "protection" means that a speaker or a speaker wire is shorted out. Or that the volume is just too damned high... how loud is the receiver's volume setting? If the bass tone control is jacked and the loudness button is on, even with no shorted wires, the amp can go into protection from an internal overdrive. Might be that you just need to do like your mom says and turn it down!
If you have an ohmmeter, speaker or wiring problems are easy to test, if you don't, you can still do it all mechanically... here's how
Turn off the receiver and start by disconnecting your speaker wires at the back of the receiver. With all of the speaker wires removed, does the thing still go into protection when you turn it back on?
If not, good. If it does, find a service center.
Re-connect the speakers to the appropriate terminals one speaker at a time, turning off the receiver each time you make a connection. After connecting one speaker, turn the receiver on and see if it shuts down. If not, then turn it off and add one more speaker.
Do this until you find the culprit. Leave that suspected bad speaker's wires disconnected from the receiver and test all the rest, connecting all but the bad wires.
Now, disconnect the speaker from the other end of the bad wires and spread the bare wires apart so they don't short out. Connect the wires ONLY at the amplifier end and turn the amp back on. Protection?
If yes, the wire is shorted out somewhere. got cats?? If everything is OK, turn off the receiver and reconnect the speaker and test again. Make sure the wires aren't shorted at the back of the speaker. You really need to check all the speakers to make sure their connections are "clean" and make sure that there are no stray wire strands anywhere or that the wires aren't stripped too much so they might be able to short out. After the wires are connected to either a speaker or an amplifier, you shouldn't be able top see much of any bare wire, but you already know that, right?
Some folks strip way too much off the wire and the wires simply touch the wrong things and ... badness happens.
If all the connections are clean and the receiver still shuts down when this speaker is connected and the receiver is turned on, swap a working speaker onto these wires, leaving the suspect speaker disconnected and making sure the other bare wires won't touch anything or each other.
Back on with the working speaker... good? If so, then we're determining that the problem is probably in that one speaker. If not, then we have a deeper problem.
Reconnect the suspect speaker to the other wires and try again. Good? Then you have "fixed" the problem by cleaning up the wiring connections. If it shuts down again, then you need to fix or replace the bad speaker.
If everything works now with the volume down and such, then just use a little self control. If it's still messed up, you may need a trip to the service shop
Good Luck

Jul 18, 2010 | Samsung HT-DB600 System

1 Answer

My car subwoofers go IN and OUT frequently as of recently. wires APPEAR to be connected. Are they blown?

The cables from the amp to the speakers could be shorting out, the speaker(s) could be shorting or going bad. The impedance of the speakers could be to low for the amplifier. The amp could be overheating because of any of the above. Turn the power off and try disconnecting one speaker, make sure no bare wires are touching. Reapply the power and observe. If it still does it , reconnect the speaker and preform same test to the other channel. The previous test can determine the side that has the problem. If the problem is still present the speakers and cables need to be checked with an ohm meter. If the cables and speakers check out then the amp speaker outputs need to be checked to see if there is any DC voltage present. If DC voltage is present on the outputs then the amp output section needs to be repaired.

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1 Answer

Stopped working

Speakers wire conductors should not touch anything but the points on the amp and one speaker terminal each. Look again.

May 20, 2010 | Pioneer VSX-918V Receiver

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Try Doing Grounding The Mute Cable To Somethign Else And MAke Sure Its Not Touching Anything And Make Sure Your Soeaker Wires Arnt Touching Each other

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1 Answer

Volume turned up, kenwood shuts off briefly...

does it keep cutting in and out?
if so i think you have your polarities crossed
make sure you have negative to negative positive to positive

Jan 27, 2009 | Kenwood KDC-X692 Car CD/ MP3 Player

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