Ricoh D146 Service Manual page 1236

BW
Sets ON/OFF variable correction for scanning level of original when
continuously scanning multiple originals using ADF.
For increasing productivity of ADF, creating correction data is done at a certain
(3min) interval.
If shade correcting data is not updated, original scanning level will change
affected by the light source brightness changing, therefore , variable will be
corrected by scanning the guide plate (white) of ADF from between originals.
002
This SP setting (enable/disable) will apply to B&W scan.
In an occasion of an unexpected malfunction and level correcting does not
work, or background density disorderly changes among multiple scanned
originals, and by changing setting these will improve; then temporarily set
correction OFF.
By setting interval shading OFF with SP4-351-001, even when ALC is set to
OFF, shading will be done each time, and will prevent density change when
having level correction OFF.
But in this case, shading data is created (moving carriage) with original interval
of ADF scanning, therefore Productivity will drop
4850 [PMW]
Latest
Displays LED lighting Duty (PWM) adjustment value of LED light quantity
adjust.
001
When output of CCD is overflowed from the amount of light, Reduces light
quantity by adjusting LED light source lighting duty when scanner powers ON.
Use for design evaluation/analyzing cause of malfunction (abnormal image,
SC).
System Maintenance Section
[0 or 1 / 1 / 1/step]
*ENG 0:OFF
1:ON(default)
*ENG [0 to 8191 / 0 / 1digit/step]
2-517
Main SP Tables - 4
D146/D147/D148/D149/D150