Toshiba e-studio281c, Service Handbook, Page: 525 / 678

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TROUBLESHOOTING
5 - 119
5
5) Moire/lack of sharpness
Fig. 5-5
Moire
Lack of sharpness
* If the trouble is not solved at the step 1 and the step 2 or followings (excluding the parameter adjust-
ment) are performed, make sure to perform “Enforced performing of image quality closed-loop con-
trol” and then “Automatic gamma adjustment” after taking a measure.
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.
Parameter
adjustment value
2 Check the image process-
ing parameters.
Check the sharpness adjustment
value.
3 Adjust the image process-
ing parameters.
While checking the above encir-
cled images A and B, decrease
moire by sharpness adjustment.
Printer section 4 Check the printer output
image.
Output the test patterns and check
them.
Color: using 04-231 for each color
Black: using 04-113
When defects occur,
perform the corre-
sponding trouble-
shooting procedures.
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.
Parameter
adjustment value
2 Check the image process-
ing parameters.
Check the sharpness adjustment
value.
3 Adjust the image process-
ing parameters.
While checking the above encir-
cled image A, increase sharpness
by sharpness adjustment.
A
B