Pioneer SX-980 mode switch problem

A new switch or the old switch taken apart and repaired.

Bad solder on the board. The stereo/mono switch almost never interrupts the signal, it only connect left and right together.

Use your noggin, look at the print or take to someone who knows what they're doing before you fry it out and own a piece of scrap.

Your problem is more likely in the tape monitor switch(es) if it is dirty switches.

The stereo - mono mode switch on this model is a simple lever switch which internally has moving contacts which slide at 90 degrees to the front panel.

This particular switch can can cleaned from the front without any disassembly. One takes the cleaner (like CAIG De-Oxit) and, using the extension tube and the nozzle set to the lightest stream, a couple small bursts sprayed in under the lever towards the rear of the unit. It helps to have the front of the receiver lifted up at a bit of an angle to help the cleaner better reach the affected contacts. After the cleaner is sprayed in, move the switch up and down at least 10 to

The person who refurbished this piece might not have cleaned all the controls - many of them are difficult to reach - or maybe the guy just wasn't that good. Some guys are all about "re-capping" and know little ablout how these things actually work. For example: I don't consider a 40 year old amp or receiver "refurbished" if the person doing the work has not attended to the speaker relay, to replace it or at least (carefully) clean the contacts.

Mark Z.

Thanks a lot Mark! I bought some Deoxit and glad I'll be able to reach without disassembly. Great info!

Thanks to all for the feedback. Cheap routes first.