Riso RP3105 sys error T98-526, Please help!

[SamTheCopyMan]

Please help! I dont usually work on Risograph, but a customer called with this error message: T98-526 sys error

Anyone know what this one is and how I can fix it?
Thanks! SamTheCopyMan

[Kopyrtek]

Drum set switch is on but drum connection signal is off.May have a bad connector:usually see this on the drum side.Can try to turn machine off,hold reset button down and power back up.

[kiwitechnician]

Go to service mode and check the drum signal. Have you tried the different or color drum ?