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Weak Right Channel, Only Aux and Tape Inputs

oreil071

New Member
Hey everyone, I have a Kenwood KR-4070 that I've used for about two years now with no problems but recently I noticed that the right channel is very quiet, but only while running through either the Aux or Tape inputs. The Phono input works flawlessly and has great sound through both L/R channels.

I tried switching between A and B speakers and the same issue is present in both. Just to make sure it's not the speakers, I swapped them and it still only applies to the speaker that's connected to the R channel.

I can get the sound to even out if I turn the balance knob to about 90% toward the R channel. When I run off of the Phono input, I put it back to 0 and it sounds great.

I did download the schematic diagram, but I'm struggling to follow the path on how the Aux/Tape input are similar or different to the Phono input.

Now I'm pretty stuck and am hoping someone else may have some advice. Thanks everyone!
 
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If the sound is clean but very quiet, I would guess that a cap/s could have drifted in the tone section of your preamp.
 
Reads like a still dirty function selector switch since it's the only switch you change between AUX/TAPE/PHONO.
 
With amp powered off/unplugged, measure resistance between left AUX RCA inner/female and pin 12 highlighted with AUX
selected. Repeat for right AUX RCA and pin 16. Expect 2.2kohms (inline resistor)
upload_2020-9-29_6-55-33.png
 
Also wiggle or push that tape monitor a few (more than 10) times.

Selector switch could be the culprit.
 
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Also wiggle or push that tape monitor a few (more than 10) times.

Selector switch could be the culprit.
I'm going to go after the selector switch again Ave check out the tape monitor some. I'll report back with results. Thanks for your guys' help!
 
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