Konica-Minolta bizhub PRESS 1250

Troubleshooting. IQ09. Printer system: Gradation error

Printer system:
Gradation error

Troubleshooting procedure

	Section	Check item	Result	Action
1	Gradation pattern	Print out the test pattern No.3 or No.5 and the gradation pattern is without any trouble.	YES	Check the other density errors of the printer system.
2	Paper	It occurs on the particular paper.	YES	Check the setting of the paper type, and fix it.
3	Density	It occurs on the particular image (such as picture).	YES	Check Copy Setting ¨ Image Setting (letters, light letters, picture).
4	Setting menu → Function setting → Density setting → Image density selection	The setting value adjustment of the image density solves the trouble. Too light: Change the setting value to the plus. Too dark: Change the setting value to the minus.	NO	Go on to the next step.
5	Check the printer	Check mainly on the charging section, transferring section, photo conductor section, and the developing section.	NO	Clean, Replace
6	Connector, wiring	There is no problem on the image processing board, the overall control board, the write section, and the connector/wiring of the printer control board.	NO	Reconnect the connector Replace the wiring
7	Image Stabilization	The image stabilization solves the trouble.	NO	Go on to the next step.
8		The problem has been eliminated through the checks of steps up to 7.	NO	Check or replace the charging section → Replace the drum → Check or replace the transferring section → Check or replace the developing section → Replace the image processing board → Replace the high voltage unit /2