I recently picked up a unidrive 3.5 of unknown working condition to use with my ROM4 //c. Unfortunately, seems like the condition is not working. When I put a disk in, it makes a sound like it's trying to line up the peg with the hole on the disk hub. Then when I boot it on my IIgs (the //c is currently boxed up), I hear a motor inside spin on-off-on-off-on-off and then the IIgs just gives me the sliding Apple error screen. I should note that I disassembled it before doing anything and cleaned the heads carefully with a qtip and 99% IPA.
The drive itself looks pretty much identical to the non-Unidisk 3.5 drive. I'm assuming I could swap the drives with one of my working 3.5 drives and test both that way? That should at least narrow down the issue to either the drive itself, or the Unidisk daisy chain board, correct?
Any early guesses on what could be wrong, and possible fixes?