First post, by Kahenraz
Today I received the firmware-matched Roland SC-55 I'd ordered. I already have several synthesizers and have had to repair a couple of Roland models in the past, so after some basic validation of function, I disassembled the unit to inspect the most common problem areas, which are all of the ports at the back that receive the most mechanical streas.
Unsurprisingly, there were a lot of cracked solder joints. I added a Louis Rossmann amount of flux and cleaned off the old solder with a wick. I then applied new solder, careful not to apply too much heat to avoid melting any of the plastic.
After the repair, I wiped down the entire unit, brushed the dust out of all the crevices, and applied DeoxIT D5 to the electcal contacts and FaderLube F5 to the volume potentiometer.
The unit works great and I now have a matched pair of Roland SC-55 synthesizers with matching 1.21 firmware.