I have this 3552ci that I was called out to that was making a grinding noise. The customer had turned it off. When I switched on, it made a grinding noise for a bit then made a C7301 and of course stopped. O month before I had replaced the transfer belt unit and the PARTS BOX WASTE H ASSY SP because of a different grinding noise caused by toner rocks on the waste box and a non repairable stopped up transfer belt nozzle. When I pulled the drive unit (something I have sadly become very familiar with doing), the gear on the waste box moved very smoothly with no drag or hesitation at all . However looking back into the machine around where the black developer connects, I discovered all kinds of powder that I think is from a gear (see pictures). When I inspected the black developer unit, I discovered more of the same.
This is the first time I have seen this before and heard the different grinding noise as well. Has anyone experienced this before?
If you have, whats the fix, please?
Thanks so much for any help.
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