August, 2006 SCANNER UNIT
6-39
Detailed
Descriptions
The Effects of SP Mode Settings on Dust Detection
The settings of some SP codes control how dust detection is done.
• SP4020 001. Switches the dust warning on and off (default: off). When this SP is
on, a warning is issued if the check detects dust on the ARDF exposure glass or
the white plate above the exposure glass. Always clean the ARDF exposure
glass and white plate before turning this SP on.
• SP4020 002. Adjusts the sensitivity of the check. If you see black streaks in
copies when no warning has been issued, raise the setting to increase the level
of sensitivity. If warnings are issued when you see no black streaks in copies,
lower the setting.
• SP4020 003. Sets the level for vertical line correction caused by dust. A high
setting can eliminate unwanted vertical lines caused by dust but it can also thin
vertical lines of the original.
• SP7852. Displays the count for the number of times the machine has detected
dust on the ARDF exposure glass at the beginning of copy jobs. This SP
operates only after SP4020 001 has been turned on.
NOTE: Dust that triggers a warning could 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.