This is now resolved (at least mostly). Leaving this here in case anyone else finds this trying to solve the same problem.
There's a trim pot "R4513" that's not mentioned in the electrical adjustments. It's labeled on the circuit diagram as "Decoder Adjust". It controls the level output ONLY when the switch is in the "NORM"/Stereo position despite the fact that the "decoder" IC controls the other output modes as well.
Adjusting that I was able to match the output levels in all three modes.
The only reason I say this...
samson7point1@yahoo.com
New Member
Last Activity: 05-16-2024, 09:30 PM
Joined: 04-30-2024
Location: Omaha
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Help troubleshooting an audio problem with an RCA SGT-250 CED Player
The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.
The player processes the audio signal using two different reference frequencies. The "R"... -
Howdy,
I'm a tinkerer. For the last twenty years I have been gradually teaching myself to do repairs. One of the most fun things for me is to take a piece of electronic or mechanical equipment that's broken and get it working again. I mostly focus on video game repairs and modifications, but I'm also really into AV gear - anything from vintage turntables to CRT televisions.
I blog about some of my activities here: yesterware.blogspot.com
Joined this forum in hopes of getting help with reading some circuit diagrams to troubleshoot a problem with a super...Leave a comment:
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