05/2014
3-24
DC SC2020
3.2.2 How to use the image quality troubleshooting (IPS)
Version 1.1
Image Quality Troubleshooting
CQ-04 Tone jump of 100 line image document
[Symptoms]
In the BW and Text & Photo Copy Mode, gradation jump occurs on 100-line photo documents.
Figure 1 j0ki31013
[Cause]
As Text & Photo Mode gives priority to 175 lpi halftone dots and text quality, Sharpen Edge is performed
for lower lpi.
[Procedure]
1. No special actions required.
[Corrective action]
CQ-05 Scan letter corruption, mosquito noise surrounding the
letter
[Symptoms]
Color texts are blurred and mosquito noise is generated around the texts due to JPEG compression.
Figure 1 j0ki31014
[Cause]
As the JPEG compression technique is for images, not texts, noise is easy to crop up when it is used to
compress texts.
[Procedure]
1. No special actions required.
[Corrective action]
1. Set the compression mode from "Normal" -> "Low Compression". (Secondary defect: The file size
becomes bigger.)
Table 1
Countermeasures Secondary Defect
Set the Original Type to "Photo". The text becomes blurred.
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