Kyocera 308ci not printing black

[moose35]

hi
i was hoping someone could help me. The printer in our office was printing all black no matter what was being printed. the whole page was just black. i pulled out the drum and the devolper unit and now it wont print black at all. is there anything i can do or look at to resolve the problem?
thank you

 

[rdkuby]

After inserting the drum unit, push the lock shaft (a) until it clicks. If you don't it will not print the color that the locking shaft is not engaged.