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Pioneer SM-Q140 Low FM Volume

49hawkeye

49hawkeye

Member
Hi everyone! I recently acquired a Pioneer SM-Q140 and have an issue with the volume on FM. When I received it all the switches and pots were cleaned and lubricated, the tube pins and sockets were also done. I then brought the power up very slowly with an isolation transformer to see if the capacitors might temporarily reform.

The receiver powered up without issue and was pulling about 1.10 amps. Both AM and shortwave bands work just fine. The FM band volume is about ¼ of the AM channels.

I am going to recap it in the near future but would like your thoughts on the low volume.

Can leaky caps be the culprit or should I be looking elsewhere and possibly getting that repaired prior to the recap?

Thanks for any light you can shed on this for me.

Dave
 
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Low only on FM?

Japanese stuff is notorious for awful caps so maybe but its hard to say for sure. I usually don't love to do large amounts of work to things that don't mostly work already but I'd make an exception here
 
Well, I just finished recapping it and everything works the same as before. Still low FM volume. It now pulls about 0.9 amps so a slight improvement there.
Anyone here with suggestions?
Thanks for any advice you can offer.
Dave
 
RM doesn't work for me unfortunately. I tried joining like 20 years ago when they physically mailed the Little Orphan Annie decoder ring from Castle Greyskull to verify the account and I was never able to get it to work.
 
gadget73 said:
RM doesn't work for me unfortunately. I tried joining like 20 years ago when they physically mailed the Little Orphan Annie decoder ring from Castle Greyskull to verify the account and I was never able to get it to work.
Click to expand...
There's no requirement to join. Download is free up to 3 per day. Just click the schematic thumbnail and it'll go through a Cloudflare-like verification, then request your email & name (which they confirm they won't share), then the schematic is sent to your email.
 
still not willing to put in any personal info. If someone wants to upload it here thats fine, but I'm not messing around with that site.
 
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