Dropped out toner density on a MP C2051

[Oze]

Or at least give them a good cleaning, then run process control and color calibration.

With a DAMP cloth

[fshead]

What was the solution to this problem, I'm having same problem. I replaced itb unit, ptr, black PCU and hv board with no change of state.

FOR ME the remedy was taking apart and swapping out the black drum locking piece that is spring loaded and
moves the right side of the ITB unit close to the black drum..
The bad one would pivot but not do anything internal...

[slimslob]

FOR ME the remedy was taking apart and swapping out the black drum locking piece that is spring loaded and
moves the right side of the ITB unit close to the black drum..
The bad one would pivot but not do anything internal...

What it does is raise the black transfer in the ITB unit. Used to be a common problem with older color units. There was a plastic tab on the inside of the door that was supposed to keep the door from being closed if the lever was in the wrong place. Customer goons would force the door close.

[GIUBOSS]

I found the problem a few times with the sponge roller touching the black drum of the transfer assembly (a jumped spring or the broken spring holder), then check the hooks that fix the transfer roller mounted just below the group of melting, they often break but do not notice once opened the machine but disassembled.

[Dan G]

Is the Transfer unit cammed into place proper?