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June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TROUBLESHOOTING
5 - 99
5
4) Background fogging
Fig.5-4
Cause/Section Step Check items Measures Remarks
Density repro-
duction
1 Check the gradation reproduction. Perform the forced performing of
image quality closed-loop control
(05-395) and then automatic
gamma adjustment.
Printer section 2 Check the printer output image. Output the test patterns and check
them.
Color: using 04-231 for each color
Black: using 04-113
See step 6
if defects
occur.
Scanner 3 Check if the original glass, mirrors
or lens is dirty.
Clean it.
Parameter
adjustment value
4 Check the image processing
parameters.
Check the value of offsetting
adjustment for background pro-
cessing (color), background adjust-
ment (black) and background peak
adjustment for range correction
(black).
5 Adjust the image processing
parameters.
While checking the above encircled
image, adjust the reproduction level
by the offsetting adjustment for
background processing (color),
background adjustment (black) and
background peak adjustment for
range correction (black).
Cover 6 Is the cover installed properly?
(Is the drum exposed to the exter-
nal light?)
Correct it.
Auto-toner 7 Is the auto-toner sensor normal? Check the operation of autotoner
sensor and readjust.
8 Is the toner supply operating con-
stantly?
Check the motor and circuits.