Hi everyone,
I have a problem with Onkyo A 803, when I got it there was no sound at all, I was investigating and decided to change the selector chip, now we have sound and the slector works but ther is one more issue that I cannot resolve. When I turn the amp on the speakers relay click a few times back and forth as the protection was trying to turn them on but it got constantly disconnected. this usually disappears after a while and the realys stay ON. It looks as if the amplifier warms up things go back to norm. However if I click the DIRECT button here we go again, constantly switching on/off. I have the schematics - it's available on the net, but the schematics is not very clear. The fact that I am a novice in the ¨bussines¨ does not help. I've already restored a couple of amps but have no clue what to do with this one. Any help will be appreciated. TIA
I have a problem with Onkyo A 803, when I got it there was no sound at all, I was investigating and decided to change the selector chip, now we have sound and the slector works but ther is one more issue that I cannot resolve. When I turn the amp on the speakers relay click a few times back and forth as the protection was trying to turn them on but it got constantly disconnected. this usually disappears after a while and the realys stay ON. It looks as if the amplifier warms up things go back to norm. However if I click the DIRECT button here we go again, constantly switching on/off. I have the schematics - it's available on the net, but the schematics is not very clear. The fact that I am a novice in the ¨bussines¨ does not help. I've already restored a couple of amps but have no clue what to do with this one. Any help will be appreciated. TIA
Hi,
Welcome to the forum!
I've attached a service manual I downloaded from mamualslib.com to make it easier for other members to contribute. It's not perfect but seems adequate.
I'll offer some starting hints that you may already be applying.
You've probably already looked at power supplies. For quickest insight, I'd look at power amp(s) offset in front of the output relays so that you can observe despite clicking relays. Use your scope if you have one. Engage DIRECT since it seems to present the problem most consistently, but comparing with normal mode also might lend insight. Does volume setting have any effect? If you get stuck, post the experiments that you've tried and their results.
Good luck!
Welcome to the forum!
I've attached a service manual I downloaded from mamualslib.com to make it easier for other members to contribute. It's not perfect but seems adequate.
I'll offer some starting hints that you may already be applying.
You've probably already looked at power supplies. For quickest insight, I'd look at power amp(s) offset in front of the output relays so that you can observe despite clicking relays. Use your scope if you have one. Engage DIRECT since it seems to present the problem most consistently, but comparing with normal mode also might lend insight. Does volume setting have any effect? If you get stuck, post the experiments that you've tried and their results.
Good luck!