Ricoh B230 Training Program page 209

Dust Detection (SP 4020)
This function checks the ADF exposure glass for dust, which can
cause black lines in copies.
If dust is detected, a message is shown on the operation panel,
but the machine does not stop.
SP 4020 001: Enable/disable (default – disabled)
SP 4020 002: Sensitivity adjustment
SP 4020 003: Adjusts image processing parameters to remove
thin vertical lines that are caused by dust (default – disabled)
•
A piece of dust on the ADF exposure glass will cause a thin vertical line
on the scanned image. This is because the ADF feeds the paper past the
exposure glass during scanning. Dust on the glass is shown on each line
of the scanned image, and the result is a thin vertical line.
SP 7852: Shows the number of times that the machine detected
dust on the ADF.
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