Ricoh V-C3 Technical Training Manual page 275

! This function checks the ADF exposure glass for
dust that can cause black lines in copies.
! The dust check is done before the first original is
scanned.
! If dust is detected, a message is displayed on the
operation panel, but the machine does not stop.
Slide 275
No additional notes
Dust Detection – Overview
" This is done only once at the beginning of a job.
The check is not done for originals added during
a long scanning job.
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V-C3 Training