70s Symphonic Console - Turntable In Stereo - Issue with right channel

[nbobetsky]

I am doing work on my old Symphonic 260-33. The turntable is not playing in stereo. I replaced the old BSR turntable (it had other issues), I've tested the wiring from the turntable to the circuit board - wiring is good. When I hit the Mono button in phono/turntable selection, both speakers are working. FM function plays in proper stereo. So, seems overall, the amp is sending in stereo, both speakers work, FM works in stereo properly, turntable is sending a proper stereo signal via the working RCA stereo wiring... what's next? A bum circuit board? I must admit, I don't know how to read these wiring diagrams, or diagnose past this - especially because I don't really know how to trace circuit board paths. That said, I thought I'd put it to the community if there is a plan of action someone with my limited experience can do?

Thanks I advance - I posted all the pertinent photos of my unit. I'd love to try to figure this out!

best,
Nick

IMG_9921

• nbobetsky
• Jun 2, 2020

IMG_9920

• nbobetsky
• Jun 2, 2020
• 1

IMG_9919

• nbobetsky
• Jun 2, 2020

IMG_9922

• nbobetsky
• Jun 2, 2020

IMG_9925

• nbobetsky
• Jun 2, 2020

 

[century tek]

Those photos are pretty much irrelevant. If it's about a turntable, you should probably have pics of the turntable in question. Does it have a stereo cartridge?

So what you are saying is that everything works in stereo except the turntable.

Have you eliminated the wiring from the turntable to the receiver by switching the input jacks? In other words, with the mono/stereo switch in stereo, if you are hearing music from the right speaker, swap inputs to see if you now get music from the left speaker. If so, then it could probably the wiring from the cartridge or one of the wires themselves is bad. If not, then the receiver itself might have a problem.

If you think it's the receiver, first Deox all pots and switches. You should also check for bad or cold solder joints at the input jacks themselves.

 

[swechsler]

A quick test would be to touch the white (left) and red (right) pins on the cartridge where they connect to the wires (also try touching the clips themselves) with a metal pin or a nail and see if you get any noise through the speakers. If you do, the problem is in the cartridge (or possibly a bad connection to the cartridge). If not, it's likely a wiring issue.