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u can use the BK drum for all colors.

u need a color-chip (im not sure if katun have them)
and u need to exchange the front holder of the new black drum with the holder of the old color drum....

exchange the hopper box unit . the gear-ring who opens the tonerbox holder (to free it) did not go to right position , so the toner box wont open.

u can solve it one time , when u use the...

developer worn out .. get a new developing unit .. (maybe more then copies than made for or older then 3,5 years)

when the paper jams before fixing unit it could be the sensor flag of the timing roller (the big silver one on mashine side and the rubber on inside the door).
or maybe the paper glide sheets...

hiho ,


error codes are only for electrical errors , there are jam codes u can see in the service mode .
this should be more helpful to solve ure problem.

generally its not possible to solve...