05/2014
3-11
DC SC2020
Image Quality Troubleshooting
3.2.1 How to use the image quality troubleshooting (IOT/IIT/DADF)
Version 1.1
IQ-7 BCR pitch (37mm) density unevenness
The contact with the photo receptor changes due to the dispersion of BCR shape.
Charging failure occurs in weak contact parts which lowers the surface potential and the density of the
half-tone image darkens with a BCR pitch (37.7mm).
Figure 1 j0bs32025
[Cause]
It is easier to occur if the combination of BCR form tolerance and Spring load tolerance, CLN-Roll pene-
tration quantity tolerance, environment (low temperature/low humidity) is set on the Stress side.
[Corrective action]
1. Xero ERU Replacement
IQ-8 DarkLines (Full speed/Half speed)
Unique phenomenon of a charged DC by BCR.
BCR <-> Fine line in an axial direction due to abnormal electric discharge between the photo receptor.
Place occurring is random.
High temperature, high humidity environment, half speed mode is a stress
• Full Speed
Figure 1 j0bs32036
• 1/2 Speed
Figure 2 j0bs32037
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