Toshiba FC-22 manual Defect of image density, color reproduction and gray balance

(3) Defect of image density, color reproduction and gray balance

Check image density.

Check gray balance.

			Check color reproduction.
Cause/Defect area	Step	Check items	Measures	Remarks
Density/Color reproduction	1	Check density/color reproduction/	Perform automatic adjustment of
/Gray balance		gray balance.	gamma correction.
Printer section (Note 1)	2	Check printer image.	Output test print image for each color	See step 6 if
			(04-231).	defect occurs.
Parameter adjustment value	3	Check image parameters.	Adjust color balance.
(Note 2)			Adjust image density.
Scanner	4	Is the original glass or mirrors	Clean them.
		or lens filter dirty?
Printer density error	5	Check density of printer image.	Perform image quality control forced
(Note 1)			performing (05-878).
			Output test print image in each color
			(04-231).
Printer image error	6	Is there any faded image (low density)?	Perform troubleshooting procedures
(Note 2)			against faded image.
		Is there any fog in the background?	Perform troubleshooting procedures
			against background fogging.
		Is there any blotch image?	Perform troubleshooting procedure
			against blotch image.
		Is there any transfer defect?	Perform troubleshooting procedure
			against transfer defect.
		Is there any cleaning defect in the	Modify transfer belt
		transfer belt?	(refer to Service Manual).
		(Check inside the machine.)

Note: 1) When adjusting printer section, perform "image quality control forced performing" and then "automatic adjustment of

gamma correction".

2) When adjusting parameters, perform "automatic adjustment of gamma correction".

January 2000 © TOSHIBA TEC 4 - 59 FC-22 TROUBLESHOOTING