I own an absolutely immaculate Realistic STA-2100D Receiver that I'm thinking of selling. Everything works including all the indicator lights and cosmetically is in near new condition. But it has one minor flaw, the right channel will intermittently go out, a turn back and forth of the function switch restores the channel. I'm thinking the function switch just needs to be cleaned? I welcome your thoughts and thanks in advance!

Question edited for clarity.

Help in the link and also specialist forums

https://www.google.com/search?q=realistic+sta-2500+stereo+receiver+service+manual

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hi, I have just done a search for realistic sta 220 manual and lots of results are thrown up, you need to try this as there so many results for the query.
I used bing rather than google.

I would like to purchase a Realistic STA-3850 AM/FM Stereo Receiver, anyone that would like to sell, please contact me at my email address: [email protected]. Thank you-dave

Is it just with the EQ (or any other single component) in the link? Old equipment develops oxidation on various controls. Depending on physical access, tuner cleaner may help. Or take it to a shop.

Try going to Realistic.com They usually have schematics and manuals.

You can find the service manual for the Radio Shack STA-2100 here. The site requires free registration before you can download. The 2100 and 2100D are basically the same except the 2100D dropped the toroidal power transformer because of legal issues. The rest of the information should help you figure out what's gone wonky in your receiver. (I saw a couple these when working for RS service. Nice unit, if a bit...large. Wouldn't mind getting my hands on one now to go with a set of Advent speakers I just repaired.)

I have a sta-2080 realistic receiver and wide range frequency equalizer plus a tape deck sct-22 all realistic.My problem is when i play the tuner or cd player witch is connected to the aux
the volume goes soft and then loud with a lot of cracking sound now ther is hardly any volume.when i play the tape deck it has it own volume control every thing is good so what parts do i need. thanks corneil

This model is notorious for cold solder joints. Chances are it needs some touch-up soldering.