Ricoh B246 SERIES, Manual, Page: 132 / 268

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Duplex Scanning Image Quality
„
Front side: Scanned by the CCD inside the main
body of the machine
z
SP 4901 010 to 014: one adjustment for each original
mode
„
Rear side: Scanned by the CIS in the ADF
z
SP 4902 010 to 014: one adjustment for each original
mode
„
Adjustments are needed for the following reasons:
z
To match the image quality of the two scans
z
To remove defects in the image caused by borders
between blocks of elements
Service manual, section 6.6.4, Duplex Scanning Mode Image Quality
ˆ
The slide explains why we need adjustments for duplex scanning.
ˆ
There are 10 adjustments
¾
Five original modes, two adjustments for each original mode (front side image
quality, rear side image quality)
ˆ
If the image quality of the front and rear sides are different, adjust either SP4901 or
SP4902 until the quality is about the same.
ˆ
In some original modes, if halftones (photos) are present, vertical white lines may
appear in the scan. To remove these, adjust SP 4902 for that original type.
¾
Then, you may have to adjust SP 4901 for that original type, to make the
image quality for front and rear scans the same.
Service manual, page 6-38, and 6-42 to 6-44
ˆ
The front side adjustments (SP 4901 010 to 014) are normally only applied during
duplex scanning. However, by changing SP 4901 019 to 1, you can apply the
adjustment to both single-sided scans and the front sides of two-sided scans.
¾
This may be needed if users are remarking on the difference in image quality
between single-sided scans and the front sides of two-sided scans.
¾
Note that such differences are less likely in Text/Photo mode, so one
workaround is to try using Text/Photo mode for troublesome originals.
ˆ
Remember that all these adjustments are only valid for the ‘custom setting’ original
types.