Still no sign of The Muse, but major progress was made this week! After being on the back burner for about a year ( ! ) I jumped back into the SX-980. I got stalled when I realized I couldn't continue with the alignment because the audio was constantly dropping out due to dirty switches in the signal path. Took a while and some forum searching ( I don't always care to watch YouTube vids...) to find out the right way to get the assemblies out for access. The front panel had to come off again to re-clean it, and once that was off, again, (what is it with me an front panels, anyway?) it was pull a bunch of screws and two control shaft nuts, and then lift the assemblies out the bottom:
Each one of the boards hanging out has push-button switches, lever switches, and/or rotary controls.
And they all needed cleaning.
The lever switches and rotary controls are easy to clean, as they're not sealed:
To get the cleaner into the rotary controls involved some improvising. I put a small piece of wire into the "straw" for the spray can, heated it gently, and bent it. I now have a "180* Adapter" for my spray can:
The push-button switches are a bit harder. Short of flooding or submerging the entire board in cleaner, there's no easy path to get the cleaner into the semi-sealed switch, and on the contacts. SO....we drill a small hole at the far end of the phenolic cover to access the cavity inside the switch. The holes I drilled are between the grey post sticking up, and the white hold-down clamp:
Put it all back together, and all the audio drops outs are gone. The controls and switches also function smoother, giving them a "quality" feel again.
So here we are, on the bench and wired up undergoing the alignment for the FM tuner and Multiplex decoder:
There's just something sooo coool about the incandescent lighting in these older radios.
After the alignment is finished, I have to repair the wood cabinet it goes into. SLW "bumped it and it fell over!" one day, causing the ancient glue joints to self disassemble......