Problem: In KC position the carriage was pushed up. The needle was not set or released at the right time, resulting in wrong position.
Cause: after long use the solenoid casing needed oiling. Selecting the needles was asking too much force. the timer belt was exposed to too much force. After putting oil in, the needles functioned again, but the callibration was wrong.
Solution: at the right wheel for the timer belt there is on the axis a small metal half moon shaped stopper. Get this of and the wheel can be pushed up. This makes it slip over the cog wheel on the solenoid axis. By slipping it a position and check, you end up selected the needles again in the right way.
Keywords: KH-940, timer belt, rotary encoder, needle selection, callibration.