Konica-Minolta bizhub C3350

Printer monocolor: foggy background

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	IDC sensor	The surface of the toner density sensor is dirty.	YES	Clean.
2	Imaging unit	Dirty on the outside.	YES	Clean.
3	PH unit	The surface of the PH window is dirty.	YES	Clean with cleaning jig.
4	Printer control board (PRCB)	Check the connection of connectors, harness, and flat cables between PRCB and PH unit, and correct if necessary.	NO	Change printer control board.
5		The problem has been eliminated through the checks of steps up to 4.	NO	• Replace the imaging unit. • Replace the PH unit. • Replace the high voltage power supply.

Printer monocolor: void areas, white spots

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Image Check	There are void areas at the front side or high density section.	YES	Printer: low image density
2		There is void area at the rear side section.	YES	Make the following adjustment: [Service Mode] -> [Imaging Process Adjustment] - > [Transfer Voltage Fine Adj].
3	Imaging unit	The surface of the PC drum is scratched.	YES	Change imaging unit.
4	Toner cartridge	Foreign matter or caked toner in the toner cartridge.	YES	Remove foreign matter.
5	Installation environment	Is the atmospheric pressure at the installation site low?	YES	Make the following adjustment: [Service Mode] -> [Machine] -> [Printer Adjustment] -> [Image ADJ Param].

Printer monocolor: colored spots

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Imaging unit	Developing bias contact terminal makes good connection.	NO	Clean contact terminal and check terminal position.
2		The surface of the PC drum is scratched.	YES	Replace the imaging unit.
3		Dirty on the outside.	YES	Clean.