05/2014
3-17
DC SC2020
Image Quality Troubleshooting
3.2.1 How to use the image quality troubleshooting (IOT/IIT/DADF)
Version 1.1
A: Unable to read the document information for this part since there is no read element.
[Procedure]
1. Check to see if the "vertical line" is appearing approximately every 18.3mm.
[Corrective action]
1. Use sharpness adjustment (weaker), photo mode.
2. The output of defect differs depending on placement of the document.
IQ-24 Image quality difference during PLT/DADF read
DADF job tends to be out of focus than during platen job.
Figure 1 j0bs32014
[Cause]
The CIS device used in DC SC2020 is a read device with shallow depth of focus in general. Read image
characteristic tends to get blurry than Platen Job since the DADF Job feed the document in a far position
from the CIS read focus.Recovery processing will be performed with DOF (Depth of Focus) correction
but it will not completely match with Platen image quality.Platen reproduces as the original, DADF
includes corrections.
[Procedure]
1. -
[Corrective action]
1. DOF (Depth of Focus) Correction Level Adjustment
IIT of DC SC2020 uses CIS read method and performs correction processing because the focus
depth is not so deep and is easily blurred.
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