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In Reply to: RE: Extremely low volume on old receiver posted by K-Bob on April 04, 2015 at 17:33:14
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.
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Mucking around the low-end since 1986.
Follow Ups:
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.
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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
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