Background - Konica Minolta bizhub PRO C6501 Troubleshooting Manual

5 Background

[Symptom]
Toner attached to the overall white area and background is slightly colored.
A: If the background is created at the process section, see probable cause A.
B: If the background contains the data (like following figure), see probable cause B.
Paper edge
Enlargement of area for judgment
[Probable causes and solutions]
A: The environment condition changed.
Perform one or more of following adjustments:
► Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [01
Covered margin fine adj]: Increase the set value to depress the background. After
setting, perform auto gamma adjustment.
► Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [03
Develop AC frequency]: Increase the set value to depress the background. After
setting, perform auto gamma adjustment.
► Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [04
Toner density fine adjustment]: Decrease the set value to improve the background.
B: The cause is in the output data.
For the correction, check and correct (remove the dots and the lines from) the image data.
Table of contents
Background appears from approx 3mm inside from the paper
edge.
Linear boundary can be seen.
Dots or lines line regularly.
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