Ricoh B064 Service Manual page 421

IMAGE PROCESSING
Equalizing Duplex Scanned Image Quality of Front/Back Sides
During duplex scanning, when SP4902 010~014 is adjusted, only the back side is
affected, so you may see a slight difference in the quality of the images scanned
from the front and back sides of the same page. You can adjust the quality of the
front side image by changing SP4901 010~014 (Image Quality Adjustment For
Front Side Scan). This mode is enabled for the Custom Setting original mode only.
NOTE: Each original mode has a separate adjustment.
Equalizing Image Quality of Front Sides for Duplex and Simplex Modes
Normally, the front side adjustment (SP 4901 010~014) is only applied for duplex
jobs. So, you may see a slight difference in the quality of images scanned in
simplex mode and for the front sides of duplex mode jobs.
If you change SP 4901 019 to 1, the front side image quality adjustment (SP4901
010-014) will be applied to both duplex and simplex jobs. This mode is enabled for
the Custom Setting only.
SP4901 019
0: Enabled for Duplex Only (default setting)
1: Enabled for Simplex and Duplex Scanning
SM 6-35 B064/B065