February, 2008
3-31
WorkCentre 5225, 5230
Fluctuation In Auto Exposure Values For Copies Of
Image Quality
Launch Version
Fluctuation In Auto Exposure Values
For Copies Of Originals Of Medium
Density
When Auto Exposure is turned [On] for originals with back-
ground of medium density (0.5G), the effectiveness of Auto
Exposure fluctuates for each job.
Cause
As medium density (0.5G) is near the upper limit value for
background detection, the Auto Exposure value fluctuates
according to the result of background detection that varies
according to the variations in the density of the original and
how the original is placed.
Corrective Action
• Disable Auto Exposure.
Gradation Jump In Text & Photo Mode For 100 lpi Photo Originals
In Text mode, making copies of images of 100 lpi (halftone dot) gradation may result in a tone jump.
Figure 1 Gradation Jump In Text & Photo Mode For 100 lpi Photo Originals Defect Sample (j0st3230)
Cause
As Text & Photo mode gives priority to 175 lpi halftone dots and text quality, Sharpen Edge is performed for lower lpi.
Corrective Action
• Make copies in Photo mode.
Secondary defect: Text is blurred.
• Change the setting from [More Text] to [Text], and then to [Photo] and [More Photo].
Secondary defect: Image quality of photographs deteriorate in [More Text] and [Text] settings. Text becomes blurred in
[More Photo] and [Photo] settings.
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