ONKYO AVR401: distorted sound in one channel

TB · 30th November 2010, 02:52 PM

Hello,
My trusted ONKYO amplifier for the past 17 years started to act on me two days ago. When I turned it on and play music the right channel became distorted. After few minutes it comes back to normal. I did not open the case yet. An amplifier is old, but I have never problem with it. Can those be electrolityc capacitors?

Thanks for the help.

TB · 30th November 2010, 03:18 PM

Just for amp details... this is solid state two channel integrated amplifier. AVR stands for audio-video. The amplifier has just additional inputs for VCR to route the signal. This is what would be called now very simple amp with no gimmicks. I just can not afford now to buy a new one. I would like to try to fix it by myself. At first I thought that could be capacitors in PSU. But, if that would be a case it should affect both channels, is not it?
I did try to serach the forum, but some questions were not answered. It looks like this is common questions for older amps.
Thanks again for help.

TB · 3rd December 2010, 05:11 PM

Any input?
At least where to start to look?
Thanks

Mooly · 3rd December 2010, 05:16 PM

Could be an electroylitic or an old ceramic cap going leaky. It's impossible to guess though.
Is the amp DC coupled to the speakers ? If so does any DC offset appear when problem occurs ?
Does it do it on all inputs... ie is it a power amp problem or not ?
Does it respond to tapping or probing the PCB with a plastic tool indicating a poor soldered joint.
Speaker relays ? these can be a source of distortion as the contacts oxidise, particularly at low volume.

TB · 3rd December 2010, 05:55 PM

Thanks Mooly. I will try to test it this weekend.

30th November 2010, 02:52 PM	#1
TB diyAudio Member Join Date: Jun 2004 Location: Northern VA	ONKYO AVR401: distorted sound in one channel Hello, My trusted ONKYO amplifier for the past 17 years started to act on me two days ago. When I turned it on and play music the right channel became distorted. After few minutes it comes back to normal. I did not open the case yet. An amplifier is old, but I have never problem with it. Can those be electrolityc capacitors? Thanks for the help.

3rd December 2010, 05:16 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	Could be an electroylitic or an old ceramic cap going leaky. It's impossible to guess though. Is the amp DC coupled to the speakers ? If so does any DC offset appear when problem occurs ? Does it do it on all inputs... ie is it a power amp problem or not ? Does it respond to tapping or probing the PCB with a plastic tool indicating a poor soldered joint. Speaker relays ? these can be a source of distortion as the contacts oxidise, particularly at low volume. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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30th November 2010, 03:18 PM	#2
TB diyAudio Member Join Date: Jun 2004 Location: Northern VA	Just for amp details... this is solid state two channel integrated amplifier. AVR stands for audio-video. The amplifier has just additional inputs for VCR to route the signal. This is what would be called now very simple amp with no gimmicks. I just can not afford now to buy a new one. I would like to try to fix it by myself. At first I thought that could be capacitors in PSU. But, if that would be a case it should affect both channels, is not it? I did try to serach the forum, but some questions were not answered. It looks like this is common questions for older amps. Thanks again for help.

3rd December 2010, 05:11 PM	#3
TB diyAudio Member Join Date: Jun 2004 Location: Northern VA	Any input? At least where to start to look? Thanks

3rd December 2010, 05:55 PM	#5
TB diyAudio Member Join Date: Jun 2004 Location: Northern VA	Thanks Mooly. I will try to test it this weekend.

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