I did originally answer the question that was asked, and I stand by that answer.
If twiddling the power switch changes the pitch, then the switch is faulty and needs replacing.
That being said, there can be a myriad of other possible faults lurking under the obvious surface.
The SH101, being made entirely of plastic, being nearly 30 years old and using a Wallwart power supply leaves it prone to a huge number of other possible problems.
Missing screws are common, usually on the voice board, but if putting one back in tidied things up, I would be looking for cracks in the relevant circuit board (why was the screw missing in the first place unless a fall ripped it out).
Check for dry joints around the Tuning pot, or if not that, the integrity of the tune pot itself, could it be broken?
The SH101 looks like a simple device at first glance, but it is full of traps for the unwary, what you may think is wrong at first glance may have no bearing on the actual fault(s).
The service manual calibration by the switch on and Transpose and Load keypresses will give you a very good idea of the state of play with your synth, I normally solder permanent test points to the CV out and ground points on the socket panel as I expect I will see them again one day, and it will save time now and probably later.
Also there are errors in the calibration section, the worst offender being to calibrate the bender offset. telling you to trim VR3 when what is actually meant is the trimmer on the bender board itself.
Regards,
John.
I just ordered a couple of SH-101 power switches from TT,
one for immediate use and another as backup. TT seems like
the only place around where I can immediately get a
replacement part from Japan here. Hopefully this will fix my
problem and I'll be on my way playing music with the SH-101
again.
Thanks again. Very much appreciated.
Jim
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