Ricoh D131 Service Manual page 637

SP4000 Scanner
DF Dust Check
This feature checks the ADF exposure glass for dust that can cause black lines
4020
in copies. If dust is detected, a message is displayed, but the process does not
stop.
Dust Detect: On/Off: Front
Issues a warning if there is dust on the narrow scanning glass of the ADF when
the original size is detected before a job starts. This function can detect dust on
the white plate above the scanning glass, as well as dust on the glass.
Sensitivity of the level of detection is adjusted with SP4020-2.
1
[0 to 1/1]
0: Off. No dust warning.
1: On. Dust warning. This warning does not stop the job.
Note: Before switching this setting on, clean the ADF scanning glass and the
white plate above the scanning glass.
Detect Level: Front
Adjusts the sensitivity for dust detection on the ADF scanning glass. This SP is
available only after SP4020-1 is switched on.
[0 to 8/1]

If you see black streaks in copies and no warning has been issued, raise
2
the setting to increase the level of sensitivity.

If warnings were issued and you see no black streaks in copies, lower the
setting.

Dust that triggers a warning could move be removed from the glass by the
originals in the feed path. If the dust is removed by passing originals, this is
not detected and the warning remains on.
Correction Level: Front
Sets the level for vertical line correction (the black vertical lines caused by dust
on the ADF exposure glass).
[0 to 4/1]
3
0: No vertical line correction.
1-7: Enables and sets the level for vertical line correction. If you select a higher
number, this can decrease the unwanted lines caused by dust. But, it can also
erase thin vertical lines of the original.
D131/D132/D133 3-62 SM Appendix