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I have a Pioneer SX-580 receiver with extremely low output level. Have to peg the volume knob to barely get background level. Even with headphones have to turn it up all the way to barely hear it. Quality of Tthe sound seems ok, if weak in the bass. here is equal output on both channels. All controls and functions operate normally. Problem occurs on aux input as well as built-in tuner. It's just as if the amp section stopped working.
Problem began suddenly and the first few times only occurred when I first turned it on and then after 5-10 minutes normal volume would kick in and sound just fine. But is all the time now.
What would go bad and take out both amp channels without affecting anything else?
--
Mucking around the low-end since 1986.
Follow Ups:
I just put an old Sony receiver in the brewery. One of the ex-brewers wanted his equipment which included a Marantz.
I had similar problems but was able to clean the AUX/FM/Phono switch and get it working great. I cleaned the volume pot and other switches since I was in there.
looking for some jazz and a little libations - joe strummer
It turned out to indeed be the tape monitor switch. It went bad somehow.
It is completely sealed so I was unable to get cleaner into it.
I got the schematic and looked at the switch layout with plans to jump the switch to force it into the "source" position. In experimenting with it I found two pins to jump that made the switch operate normally.
I am the first to admit that this kind of work is not my forte and I have trouble reading schematics, so I cannot explain how soldering a jumper between those two adjacent pins made the switch work again. By all rights it shouldn't have. Anyway, it is working normally again. Hurray!
I did no other work besides blowing the dust out of it and looking for swollen caps. I did not clean any other switches or the tuner since everything is working fine. Btw, I just use Radio Shack contact and control cleaner, which I used to clear up a problem with the selector switch on my Rotel pre just before I started on the Pioneer.
Thanks again guys, I'm glad to heave the old Pioneer back in the bedroom.
--
Mucking around the low-end since 1986.
Had a speaker switch do the same exact thing. Just stopped working one day for NO reason?
Excellent job
Selector switch on my Rotel started getting fuzzy, but only in one position. Thought for months my tuner (or the interconnect) was dying. Once I assumed it was the tuner or the wire, it took a little while to shift gears and realize it was the switch. Stupid dirt/corrosion.
--
Mucking around the low-end since 1986.
On some of these switches, you can drill into them and spray with Deoxit. I still have tape decks, so I want the loops.
Dave
"completely sealed", eh?
all the best,
mrh
Completely enclosed. No gaps or anything. Only two TINY holes on top.... not enough for cleaner to get in to the contacts. Unlike the Rotel which was easy to clean with the cleaner.
But the jumper worked.
--
Mucking around the low-end since 1986.
It will take courage, but if the only other option is to replace, you not really risking anything. I plan to give it a try on my Adcom GFP-1a preamp. There are too many switches to replace them all.
Dave
I thought about drilling it, but not knowling the interior design of it I'd prob drill in the wrong place. Since I only needed one position to work I elected to just jump the switch. Pure luck that what I did made the switch work normally... go figure.
--
Mucking around the low-end since 1986.
Interesting! I wonder what happened there.
Dave
Talked to a friend about it and he's like, "You just re-established a bad ground." Duh! Somewhere along the path the ground to the switch went bad, and my jumper re-established it.
That's the only thing that makes any sense.
--
Mucking around the low-end since 1986.
That sounds very plausible.
Dave
... and don't skimp; CAIG's DeOxit is the best readily available contact cleaner (although not compatible with absolutely every possible device, and also bereft of lubricant).
If this is unfamiliar territory to you, see the guide at the link below.
If it's not a noisy (intermittent) control -- it could be serious. Does it do it on all inputs?
(oh, and my apologies if all of the above is old news)
all the best,
mrh
I would leave it alone and give it to your kids. Make your lfe a lot better
"What would go bad and take out both amp channels without affecting anything else?"
Possibly a messed up or mis-set tape monitor loop switch.
Eli D.
Jumped a couple of pins on the switch and it works normally now.
My theory is that somewhere along the path the ground to the switch went bad, and my jumper re-established it.
Thanks for putting me on the right track.
--
Mucking around the low-end since 1986.
Cool, thanks. It does seem to be the tape monitor switch. Didn't think to check that. Normal volume when connect to tape in (after fiddling with switch). The switch is sealed but I'll see what I can do about hitting it with cleaner.
--
Mucking around the low-end since 1986.
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