the easiest way to determine, if the fault is in the SH-1oh1 or if it is due to differences of the SH-101s would be to put #61 into the other SH-101 and see if it is working.
So, if you play the synth via the keyboard, it always plays the same note. Can you find out which one by any chance?
Am I understanding this correctly: If you play it via midi, it does work correctly?
If you set sustain to max, can you hear a note, even if no key is pressed?