Konica-Minolta bizhub 4052

Printer: foggy background

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Toner density sensor	The surface of the toner density sensor is dirty.	YES	Clean.
2	Imaging unit	Dirty on the outside.	YES	Clean.
3	MFP board (MFPB)	Check the connection of connectors, between MFPB and printhead, and correct if necessary.	NO	Change MFP board.
4		The problem has been eliminated through the checks of steps up to 3.	NO	Replace the imaging unit.
				Replace the printhead.
				Replace the power supply unit.

Printer: 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	L.16.2.15 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	Replace the imaging unit.
4	Toner cartridge	Foreign matter or caked toner in the toner cartridge.	YES	Remove foreign matter.
5	Transfer roller	There is any stain, damage, deformation or abrasion on the transfer roller.	YES	Replace the transfer roller.

Printer: black 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.