Old receiver problem... Ideas?

Hi Ho

Hi Ho

Audioholic Samurai
Having built new speakers for my home theater system, I have some extra Advent Smaller Loudspeakers lying around. I wanted to set a couple up in my bedroom so I stopped by Goodwill to see what they had in the way of receivers. They had a huge selection of two. One was an older JVC ProLogic receiver with clip connectors for the speakers. The other was an Onkyo TX-88 from 1987 complete with remote, manual, and even a brochure. The Onkyo, which is rated to 80wpc (20hz-20khz, both channels driven), rated to 4 OHM, and weighed three times as much, looked like the best deal.

After doing a primitive test in the store, I determined that it was working. I bought the Onkyo for $20. I brought it home, hooked it up, and it was sounding very nice. Finally, something that can do my old Advents justice. I played that "bass test song" that someone linked to in another thread and one would have sworn there was a subwoofer!

I played it at high volume for about an hour. Then, I moved it into my bedroom and started playing something at a lower volume. After less than five minutes, the amp shut off. I turned the power on/off a few times and got the amp to come back on but it only works for a couple minutes or less before shutting off again. I can tell when the amp turns on/off because the relay switch is quite loud.

The main points:

When playing at high volume, there are no problems.

When playing at low volume, it plays for only 2 minutes or less.

About 80% of the time, when I try to turn the volume up with the remote (motorized volume knob), it will shut off the instant I push the button.

Someone on another forum suggested that it may be a ni-cad battery backup corroding and causing the processor to lock-up or, if it shuts off while playing nothing, a DC offset problem. Neither of those seem to be the case. I cannot find anything that resembles a battery of any kind and when playing nothing, it does not shut off.

Any ideas? I have seven days to exchange it if I cannot get it to work.
 
Last edited:
mtrycrafts

mtrycrafts

Seriously, I have no life.
Hi Ho said:
Having built new speakers for my home theater system, I have some extra Advent Smaller Loudspeakers lying around. I wanted to set a couple up in my bedroom so I stopped by Goodwill to see what they had in the way of receivers. They had a huge selection of two. One was an older JVC ProLogic receiver with clip connectors for the speakers. The other was an Onkyo TX-88 from 1987 complete with remote, manual, and even a brochure. The Onkyo, which is rated to 80wpc (20hz-20khz, both channels driven), rated to 4 OHM, and weighed three times as much, looked like the best deal.

After doing a primitive test in the store, I determined that it was working. I bought the Onkyo for $20. I brought it home, hooked it up, and it was sounding very nice. Finally, something that can do my old Advents justice. I played that "bass test song" that someone linked to in another thread and one would have sworn there was a subwoofer!

I played it at high volume for about an hour. Then, I moved it into my bedroom and started playing something at a lower volume. After less than five minutes, the amp shut off. I turned the power on/off a few times and got the amp to come back on but it only works for a couple minutes or less before shutting off again. I can tell when the amp turns on/off because the relay switch is quite loud.

The main points:

When playing at high volume, there are no problems.

When playing at low volume, it plays for only 2 minutes or less.

About 80% of the time, when I try to turn the volume up with the remote (motorized volume knob), it will shut off the instant I push the button.

Someone on another forum suggested that it may be a ni-cad battery backup corroding and causing the processor to lock-up or, if it shuts off while playing nothing, a DC offset problem. Neither of those seem to be the case. I cannot find anything that resembles a battery of any kind and when playing nothing, it does not shut off.

Any ideas? I have seven days to exchange it if I cannot get it to work.
May need to call Onkyo tomorrow:eek:
 
I

ionita

Audiophyte
TX-88 Onkyo

Hi Hi HO,
Did you figure out the problem with your onkyo? I got the same model for $30 along with a Sony CDP-203 and i love both components; I dont have the manual for the receiver so i would know where to look for the Ni-Cd battery in case i have to change it. Maybe you can tell me (if you remember);

Thanks,

ionita
 
Hi Ho

Hi Ho

Audioholic Samurai
Funny you asked now. I actually hadn't touched the receiver for quite a while as it was collecting dust in my shop. I opened it up last weekend to take another look and clean it out. This time I took off the bottom panel and, BINGO! One of the 15,000 uF capacitors is blown. That could explain the issues I have been having. I'm going to see if I can get a replacement for a reasonable price where I work.

About the Ni-Cad battery, I never found one.
 
Seth=L

Seth=L

Audioholic Overlord
No way? It all makes sense now. I think I know what was wrong with that Fisher integrated I had now.:) It would cut out sometimes, but only at lower volumes.
 
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