Fogging Around High Density Patch Part; Vertical Line Due To Lack Of Pixels Between Cis Chips - Fuji Xerox DocuCentre SC2020 Service Manual

DC SC2020
Version 1.1
IQ-22 Fogging around high density patch part
"Fogging around high density patch part" occurs due to the cavity performance of the CIS device.
Figure 1 j0bs32012
[Cause]
The cavity (*) performance of the CIS device used for DC SC2020 is poor compared to the conventional
device. Due to this, fogging around high density part may occur depending on the setting of the copy
mode.
This is almost never seen in Default Mode, but with Picture Mode or Ground Color removal OFF setting,
this defect is seen clearly due to the balance with image quality creation that is trying to recreate the high-
light well.
*1:A phenomenon which fogging occurs around high density patch resulting from Read Device optical
characteristic taking in the density of the surrounding part. This effect is seen especially in main scanning
direction.
[Procedure]
1. Copy setting: Check with photo mode or turning ground color removal OFF.
[Corrective action]
1. Change the following NVM values.
• 15-092 = Current Value - 2
• 715-093 = Current Value - 2
• 715-094 = Current Value - 2
• 715-095 = Current Value - 2
05/2014
3.2.1 How to use the image quality troubleshooting (IOT/IIT/DADF)
3-16
IQ-23 Vertical line due to lack of pixels between CIS chips
The "vertical line" may appear approximately every 18.3mm.
[Cause]
There are image pixels that DIS Device used in DC SC2020 is unable to read by main scanning 432 pixel
units. (Approx. 18.3mm)Complement processing against this lack of pixel read will be done by image pro-
cessing, but depending on the characteristic of the document, a defect of vertical line appearing in miss-
ing pixel part may occur.Document that can easily generate this defect is cot and periodical vertical line.
Does not occur in solid print part.
Image Quality Troubleshooting
Figure 1 j0bs32013
Figure 2 j0bs32033