Detecting Dust In Stream Reading - Canon iR105 Service Manual

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CHAPTER 2 NEW FUNCTIONS

2.8 Detecting Dust in Stream Reading

In addition to the common points for stream reading, the machine uses an additional 6

points each for small-size and large-size sheets at intervals of 0.5 mm to avoid areas of dust

(in total, 7 points for small-size and 7 points for large-size).

Normally, the machine uses the same point for reading as the GP605 (iR600); if it detects

dust, however, it changes the point of reading to prevent dust from appearing in images. The

detection of dust is executed at the end of each single job that uses stream reading; the ma-

chine moves the ADF belt idly when stream reading is selected and identifies any black line

as an area of dust.

When it detects dust, it resets the current point of stream reading, and uses the point of

reference on the leftmost edge for dust detection; if dust is detected, it moves the point of

stream reading to the right by 1 point (0.5 mm) for detection of dust for a second time. If

dust is not detected, the machine uses that point as the point for stream reading. If dust is

detected once again, it will use the next point. If dust is detected at all 7 points, the machine

will indicate the message "Copyboard Glass Soiled," which will remain unit the ADF is

opened and the copyboard glass is cleaned. The machine will not use stream reading but use

fixed reading as long as the message remains.

Black line on

3 mm (7 points)

2000 2000 2000 2000

CANON iR105 REV.0 JULY 2001

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