I have a problem with my //c: It mostly shows the message "Check Diskdrive" when trying to boot.
After swapping the ROM FF with a ROM04 Eprom this behaviour changed and the //c work some better. But after inserting a "special" disk from my collection, the //c got back to the above behaviour. Even if the disks where written the same day on this //c. The disks are working properly on my ][ europlus.
I have already tried to clean the drive, but with no change. Seldom it reads the disks, so I am guessing it is not a completly hopeless case.
Which components, besides the drive itself, could be affected? - Unfortunally I have no parts at site to run try&error.