Onkyo TX-810- Intermittent Left Channel Issue

[Arthur Smith]

I have an Onkyo TX-810, that has a weird issue. When I turn it on, and it is at low volume, sound only comes out of the right channel. This is true both of the speaker outputs, and the headphone output. When I gradually turn the volume up, sound comes out of the left channel. When I turn it off, and turn it back on, I sometimes have this happen again, sometimes not.

I have dusted out the unit with canned air, and cleaned the volume controls out with DeOxit.

Any suggestions? Thank you, Arthur

 

[century tek]

Next thing on the list would be to check the protection relay for pitted contacts.

When you turn on your Onkyo, do you hear a click inside? If so, this would be the relay that needs to be checked.

 

[Arthur Smith]

Next thing on the list would be to check the protection relay for pitted contacts.

When you turn on your Onkyo, do you hear a click inside? If so, this would be the relay that needs to be checked.

Thanks. Yes, the receiver does click and go out of protection mode. Having never seen contacts on the relay, I would not know how to identify and remedy pitting. Forgive me, but can you provide some details?

 

[century tek]

Are you confident enough that you could do this yourself? The requirement is to locate the relay, carefully remove the plastic cover and make sure you have enough room to get to the contacts without having to remove the relay completely.

I have heard of people using a tab of paper soaked in deoxit and running it between the contacts a few times. I had this problem with a Pioneer integrated amp of mine a few years back so I removed its relay and cleaned the contacts with very very fine grit sand paper. It has been working flawlessly ever since however, I really wouldn't recommend using sand paper if you are a novice at this sort of thing as it is possible to ruin the contacts. I have seen contacts made of steel and some with copper. The copper one's are more prone to damage with something like sandpaper.

I have been doing electronics for over 40 years so I knew if I ruined the contacts, I could just put in another relay but so far the thing has been working great with no intermittent drop out problems.

 

[dr*audio]

Cleaning the contacts will only work for a short time because the plating is worn off and the contacts start to oxidize. the relay needs to be replaced. You have to de-solder it from the bottom. To confirm the relay is the problem, with the volume low, tap on the relay with a Bic pen or similar non conductive probe. If the channel comes in or goes out, the relay is bad. The relay is a small black plastic box about 1" x 3/4". The part number is written on the relay.

 

[Arthur Smith]

Cleaning the contacts will only work for a short time because the plating is worn off and the contacts start to oxidize. the relay needs to be replaced. You have to de-solder it from the bottom. To confirm the relay is the problem, with the volume low, tap on the relay with a Bic pen or similar non conductive probe. If the channel comes in or goes out, the relay is bad. The relay is a small black plastic box about 1" x 3/4". The part number is written on the relay.

Thank you! -Arthur

 

[century tek]

Cleaning the contacts will only work for a short time because the plating is worn off and the contacts start to oxidize.

Not always. It depends on how badly pitted the contacts really are. Like I said, I cleaned mine a few years ago and I'm not about to replace it anytime soon.

 

[dr*audio]

As a professional repair tech I can't afford having units come back. I used to clean the relays until until I got recalls and also some of my own units failed. No more cleaning relays. You can do it on low power relays, like muting relays in a preamp. Those usually just get dirty.

 

[Blue Shadow]

The black box relays used in the tx904/906 units have responded well to cleaning. Pop the top of the relay off remove the clip that holds the contact arms and you have access to the contacts. A burnishing and blowing them out has kept a 906 running for years. Used regularly and cycled a number of times a day. Yes, new relays is correct, I'm ready when needed. But the unit works fine right now

 

[Scotty99]

The black box relays used in the tx904/906 units have responded well to cleaning. Pop the top of the relay off remove the clip that holds the contact arms and you have access to the contacts. A burnishing and blowing them out has kept a 906 running for years. Used regularly and cycled a number of times a day. Yes, new relays is correct, I'm ready when needed. But the unit works fine right now

Hi,

Wonder if you can help? How did you get to the relays on the 906. I have an 876 and I think thy are buried at the bottom under other ic boards, thanks.

 

[Blue Shadow]

The relays were either right there and available or under one board that did require some disassembly to get to the relays underneath. A few screws removed and the board and some wiring was moved out of the way to allow access to the top of the relays for cleaning. Can't know exactly until I'm inside a unit but fortunately these units can be worked on.

 

[Scotty99]

thank you. This is the 876 , see posts below. Speaker terminals are at the bottom. Looking at the ic schematic in the service manual i think the relays are one of the last components prior to the terminals. That would put them on the lowest ic card. Think this means i need to remove the hdmi card (can see it in the top down photo) and the card below it. Looks like a lengthy job. Thoughts? Thanks and merry xmas.

Onkyo_txsr876_black_large-1

• Scotty99
• Dec 25, 2016

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• Scotty99
• Dec 25, 2016
• 1

 

[Scotty99]

170cbd47_vbattach185322

• Scotty99
• Dec 25, 2016
• 1

Onkyo_txsr876_black_large-1

• Scotty99
• Dec 25, 2016

 

[Blue Shadow]

maybe the bottom has access.