Roland sh3a only plays a single pitch across all of the keys ; the onboard random sequencer, plays all of the pitches. I am stumped- please advise!
Make sure that there are no key contacts that are stuck making contact. If one is making contact when it should not be, pressing new notes might be triggering the gate (i.e. playing a note) but the CV for the pitch will be stuck on that one note.
Well… visually, there are no keys engaged- to determine if two key contacts are engaged, will I need to open the keyboard up? Thanks!
Just wondering if there might be some foreign object (e.g. paper clip) that fell down in between keys that could be making a shorted contact across key contacts, faking like a pressed key when none are. I’ve seen loads of debris in keyboards while rehabbing and cleaning them. My first experience was rehabbing an old “family” Hammond organ when I was in high school. You should have seen the pile of flotsam and jetsam I cleaned out of those 2 manuals (and elsewhere) including young children’s tiny toys. Kids love to stuff things in cracks. Pizza in the VCR player slot, anyone? Good luck!
Does the s&h play pitches above and below the constant note or is the constant note the highest or lowest of the s&h pitches?
I doubt that. The keyboard is mechanically quite impossible to get stuck. The same for the foreign object idea.
My suspicion is the wire which transports the CV from VCO board pin24 to the rotary switch for the “sampler” vulgo sample&hold switch. May be also the rotary switch itself.
I have an SH3a on my bench at the moment, so I may take some pictures.