Scanner Unit
540
[A]: Reading position
[B]: Exposure glass
[C]: Dirt
• Dirt is detected when a document passes through, so the alert will not disappear until reading of
the next document begins, even after exposure glass cleaning is performed.
• If dirt is detected not on the exposure glass but on the background guide plate, the alert will not
disappear even if the glass is wiped.
• The time required for the first copy is slightly (almost imperceptibly) longer.
• The detection threshold can be changed using SP4-020-002 (Dust Check > Dust Detect:Lvl).
(The larger the value is, the smaller the dirt particles that can be detected.)
• Do not change the setting of SP4-020-003 (Dust Check > Dust Reject:Lvl).
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