Konica-Minolta bizhub C3350

How to identify problematic part

• This chapter is divided into two parts: “Initial check items” and “Troubleshooting procedure by a particular image quality problem.”
• When an image quality problem occurs, first go through the "Initial check items" and, if the cause is yet to be identified, go to "Troubleshooting procedure by a particular image quality problem."

Initial check items

• Let the machine produce a test print and determine whether the image problem is attributable to the scanner or printer system.
• Evaluation procedure

Action	Result	Cause
From [Service Mode], select [Test Mode] -> [Gradation Pattern], and produce a test print. Is image problem evident?	YES	Printer
	NO	Scanner

Scanner system: white lines, white bands, black lines and black bands in sub scan direction

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Original	Original is damaged or dirty.	YES	Change original.
1-Side
2	ADF	Original pad is dirty.	YES	Clean.
3	Original glass	Original glass is dirty.	YES	Wipe the surface clean with a soft cloth.
4	Service Mode -> Machine - > Scanner Area -> Scanner Image Side Edge	The adjustment value for [Service Mode] -> [Machine] -> [Scanner Area] -> [Scanner Image Side Edge] falls within the specified range.	NO	Readjust.
5		The problem has been eliminated through the checks of steps up to 4.	NO	Replace the scanner unit.
2-Sided
6	When ADF is being used: 2nd side	CIS reading section is dirty.	YES	Clean.
7		The problem has been eliminated through the checks of steps up to 6.	NO	Replace the ADF.

Scanner system: white lines, white bands, black lines and black bands in main scan direction

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Original	Original is damaged or dirty.	YES	Change original.
1-Side
2	ADF	Original pad is dirty.	YES	Clean.
3	Original glass	Original glass is dirty.	YES	Wipe the surface clean with a soft cloth.
4	Service Mode -> Machine - > Scanner Area -> Image Position: Leading Edge	The adjustment value for [Service Mode] -> [Machine] -> [Scanner Area] -> [Image Position: Leading Edge] falls within the specified range.	NO	Readjust.
5		The problem has been eliminated through the checks of steps up to 4.	NO	Replace the scanner unit.
2-Sided
6	When ADF is being used: 2nd side	CIS reading section is dirty.	YES	Clean.
7		The problem has been eliminated through the checks of steps up to 6.	NO	Replace the ADF.

Scanner system: black spots

Troubleshooting procedure

Step	Section	Check item	Result	Action
1	Original	Original is damaged or dirty.	YES	Change original.
1-Side
2	ADF	Original pad is dirty.	YES	Clean.
3	Original glass	Original glass is dirty.	YES	Wipe the surface clean with a soft cloth.
4		The problem has been eliminated through the checks of steps up to 3.	NO	Replace the scanner unit.
				Replace MFPB.
2-Sided
5	When ADF is being used: 2nd side	CIS reading section is dirty.	YES	Clean.
6		The problem has been eliminated through the checks of steps up to 5.	NO	Replace the ADF.