Question about Harman Kardon AVR 500 Receiver

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The one front speaker channel is not working. is there anything one can do short of a technician looking at it?

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Yes, you can isolate the failure mode somewhat by swapping the speakers and the speaker cables, noting what input(s) are affected, swapping its cables if ONLY ONE fails.

Onboard FM is the best sound source to use for speaker isolation problems as it is does not involve external cabling. Or you could use the onboard speaker level test tones for the same reason.

Posted on May 29, 2010

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The Amp clip light is always ON only the left channel and the same channel is not functioning by giving sound, please help


I looked at a schematic for EP2500 which is same but has a lower buss voltage than the EP4000. Below, the drive signal to the power stage is full wave rectified to illuminate the LED, d-c is presented to the LED if R128 & R138 has an a-c return. There is a line that can push-up the a-c return. It goes off to a connector that is unknown. I suspect the push-up voltage is not there. It could mean anything. I think its coming from the main transformer, Check for blow fuses.
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Also the speaker output is protected with a "Crowbar" circuit. It is simply a Triac device (light dimmer) or two SCRs to prevent d-c from shorted output devices being applied to the speakers. which would cook the speaker coils. This may be activated when amp is turned on. Then there is the possibility of the output power devices - one or more shorted.
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The amp needs to be checked out by a repair technician.

Feb 04, 2016 | Behringer EuroPower EP4000 2Channel...

1 Answer

Sansui AU-D33 Lh speaker channel not working.


As the channels are identical you can use the good channel has a guide to the bad one. First thing is to look around see if anything does not look the same as the right channel.

If nothing obvious stands out, with the power on, using an insulated screwdriver touch the two channels one at a time. Keep away from the power supply and anything that is common to both channels. The channel will buzz once touched. Depending which points you touch them. The right channel will tell you if it should buzz at that point. Work backwards from the speaker outputs if you can. If you hear a buzz on the left channel then it is working at that point, if it produces the same sound on the right.
Using this method you should track down the part that has gone.

Dec 11, 2015 | Audio Players & Recorders

1 Answer

I have 255 receiver, when its playing short cercuited the left side speaker and after that side is not hearing any thing. how its solve


The left audio output channel must be replaced, and since it shorted the speaker that also need to be replaced, but I would recommend a service technician take a look at the unit.

May 07, 2012 | Audio Players & Recorders

1 Answer

Shorted binding post


The front right channel audio output semiconductor will need to be replaced, and i recommend a qualified technician because this will be a complex repair.

Mar 19, 2012 | Onkyo TX-DS494 Receiver

1 Answer

2004 Chevy Cavalier I have a regular stock radio that the display works, you can change the channel, work the CD player but there is no sound output.


To diagnose this you need to remove the cd player. Then check that the wiring looks good. Then check your speakers themselves. If this fails to find anything, you need to check the wiring to the speakers. Remove the harness from the back of the cd player. Now use a multimeter set to continuity test to probe the speaker wire at the harness and at the other end where the speaker is (with speaker unhooked). If there is continuity from pos. to pos. and neg. to neg. the wiring to the speakers is good. But if probing for instance the positive of the front left speaker at the harness and speaker area you notice both the wires down at the speaker have continuity, you have short circuited speaker wires. This would cause at least the speaker hooked to those wires to not work. It may even cause none to work. Check all the speaker wires for proper continuity. If you still don't find anything I would guess that you need a new cd player. I know that cavaliers had some sort of antitheft in the cd player but I'd assume if it was the problem the cd player would just not function at all.

Sep 19, 2011 | Car Audio & Video

1 Answer

Pioneer VSX-21 Elite: Issue: after playing music softly for about 1 minute the machine goes into "overload" mode. Unplugging will reset this. Keeps going into this overload mode, acts like...


Check to see if the unit is getting unusually hot.
If it is, check the impedance of the speakers and speaker wires to make sure they aren't shorted, or close to shorted (ie - partially blown speaker).
Try running the unit with the speakers detatched to see if it still happens.
If the unit gets hot with no speakers and goes into overload, then we need to start checking the components inside.
Look for electrolytic capacitors that are bulged at the top, or that have discolored the circuit board at their base (leaking).
Any caps doing this will need to be replaced, and will likely solve the issue.
If there aren't any, or if that doesn't solve the issue, start checking the transistors at the output.
Look to see if there is a DC voltage riding on them, and make sure they aren't shorted out.
If the power amp is a hybrid chip, see if you can find one cheap and replace it if you can't see anything else wrong, or if one of the hybrids is overheating a lot.

Jul 13, 2011 | Pioneer VSX-21 Receiver

2 Answers

Front right speaker got wet, started cutting out. at the same time the rear right speaker started cutting. switched the rear speakers to opposite channels and this caused the right to work and left to cut....


the speaker getting wet will short it out. Shorting the output on any amp will ruin it. there is a right and left chanel with 2 outputs. Right chanel is damaged.

Sep 30, 2009 | Boston Acoustics GT-42 Car Audio Amplifier

1 Answer

Not able to figure out how to turn off the outside speakers.


This receiver has four channels. Typically in a car that would be two front and two rear speakers. I would guess that the outside speakers are the rear channels and the inside speakers are on the front channels. Look in the manual for front to rear balance adjustment, and place the balance on front. Hopefully, the inside speakers will work, and the outside speakers will not.
If this does not work, get back to me and we'll figure out other possible solutions.

Jul 30, 2009 | Dual XD6210 CD Player

1 Answer

Quiet front R channel on Sony


Does problem persist when you connect other speaker to front right channel? (i.e. when you connect your FL speaker to FR and vice versa)?

Jul 15, 2009 | Audio Players & Recorders

3 Answers

Front two speakers not working at all


Hit the the speakers A/B/Off button on the receiver. If you plugged the front channels speaker wire next to the center channel on the back of the receiver make sure its showing B. If you plugged them in the banana plug part, make sure its showing A.

Apr 12, 2007 | Audio Players & Recorders

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