I will have a look and see if i have the schematic for you , it could also be one of the development clutches that is slipping and not pulling forward , if you open the front door were you install the cartridges you will see there is a switch on the right hand side , stick like a screwdriver in there to jippo the door , then make a copy and see if the magenta dev init engages(meaning that it pulls all of the colours forward to the opc belt when making a copy , if magenta is not pulled you will know it is either the clutch or the board then .
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Black drum motor error. These machines are bad about the waste toner building up in the drum unit. You could try and take the auger out of the drum unit(very messy) and clean it out or try replacing the black pcu.
Disconnect the printer or at least be sure it is turned off.
I'd do both and reinstall the CD software program that came with
the printer. When the software program asks you to connect the
printer to the USB port, do so and it should again work properly.
Hope this helps. Bud
open rt. door remove the waste toner ant the color and black drum units undo the green screws and slide out, watch out for the green swutch an the left side of transfer unit thurn it up so as not to break it both going in and out