Missing yellow color mpc2500

**kayjaig** · 03-04-2011

i have seen few machine missing part of the yellow color ( See photo of test page). force yellow toner can not make any better. Someone please help. thanks.

**wfinn** · 03-04-2011

transfer belt. This is actually common. The roller under the transfer belt will either fall off or the holder will break off under the affected color. sometimes you can take the belt unit apart and fix it but with as cheaply made as they are its usually easier to replace. I have only been able to fix one of three. Two of them came broken from the factory brand new in box and one happened over time. Does the exact thing you show on the picture.

**pro.b.unal** · 03-09-2011

laser unit should be fixed on the metal cover

**teebee1234** · 03-09-2011

Did you or anyone else recently replace the developer unit or work on it? Besides wfinn's mention of the transfer roller, another common problem with the same symptom is the rear brass bearing wasn't put in or fell out where the mag roll shaft goes through the rear pcu frame. That will cause the light/blank area due to the rear end of the developer not against the pcu (unless that blank area is at the front edge, then I would also suspect the transfer).

**Silvertoast** · 03-09-2011

as stated above its the transfer unit, the yellow roller in itb is failing to raise up on that side

**Zeldaman** · 03-10-2011

Hi there!
Very important on MPC 2500: installing new firmware, there was a bug and therefore the shutters of the printerhead opend not completly.
Greetings...

**Gift** · 03-15-2011

Stop the machine during printing a full yellow page / large format and see if the toner image looks ok on the drum - in this case it would have nothing to do with the transfer unit. The laser shutter issue may be a reason as well as other possible problems within the PCU (improper contact of the charge roller...).