Konica-Minolta bizhub C3350

Printer monocolor: uneven density in main scan direction

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Imaging unit	The surface of the PC drum is scratched.	YES	Replace the imaging unit.
2		Dirty on the outside.	YES	Clean with cleaning jig.
3	PH unit	The surface of the PH window is dirty.	YES	Clean with cleaning jig.
4	Transfer roller	Check that the spring does not come off during the pressure operation of the transfer roller.	NO	• Correct. • Replace the transfer roller unit.
5	Transfer belt unit	Transfer belt unit makes positive contact with plates on rails.	NO	Check and correct contacts.
6		Is abnormality found in the cam gear?	YES	Replace the transfer belt unit.
7		The problem has been eliminated through the checks of steps up to 6.	NO	• Replace the PH unit. • Replace the high voltage power supply

Printer monocolor: low image density

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	IDC sensor	The surface of the IDC sensor is dirty.	YES	Clean.
2	PH unit	The surface of the PH window is dirty.	YES	Clean with cleaning jig.
3	Transfer belt unit	Transfer belt unit makes positive contact with plates on rails.	NO	Check and correct contacts
4		Is abnormality found in the cam gear?	YES	Replace the transfer belt unit.
5		The problem has been eliminated through the checks of steps up to 4.	NO	• Replace the imaging unit. • Replace the IDC sensor. • Replace the printer control board. • Replace the PH unit. • Replace the high voltage power supply.

Printer monocolor: gradation reproduction failure

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Photo/density	Original type and screen pattern are selected properly.	NO	Change screen pattern.
2	PH unit	The surface of the PH window is dirty.	YES	Clean with cleaning jig.
3	IDC sensor	The surface of the IDC sensor is dirty.	YES	Clean.
4		The problem has been eliminated through the checks of steps up to 3.	NO	• Replace the imaging unit. • Replace the printer control board • Replace the PH unit. • Replace the high voltage power supply.