Canon DR-9080C Service Manual page 30

CHAPTER 2 FUNCTIONS & OPERATION
No.
When documents are placed on the document tray and pick-up is started, the document
tray motor is started. The document tray is raised by a preset amount after the document
tray HP sensor is switched from ON to OFF.
When the document tray is raised and the pick-up sensor detects the document, the
document tray motor stops and the main motor is started.
The pick-up motor, feed motor, and retard motor are started at the same time.
When the two front registration sensors (R & L) detect the document, the pick-up motor
stops and the pick-up solenoid turns ON. While the pick-up solenoid is ON, the pick-up
roller retracts from the document.
If there is a difference in detection timing between the front registration sensors (R & L), it
indicates skewing. When roller deskew (skew correction) is selected, the document is
pressed against the registration roller to perform skew correction.
The registration clutch is turned ON a specified time after the front registration sensors (R
& L) detect the document together.
After the back registration sensor detects a document, the feed motor stops.
After the end of the document passes the front registration sensors (R/L), the document
tray is raised by one sheet when both sensors detect no document.
After the end of the document passes the back registration sensor, feeding of the second
document is started when the sensor detects no document.
Same as
Same as
Same as
After the end of the document passes the front registration sensors (R & L), the
registration clutch is turned OFF when both sensors detect no document. Since the
pick-up sensor is turned off, no document is detected on the document tray.
After the end of the document passes the back registration sensor, the pick-up motor, feed
motor, retard motor and main motor are turned OFF a given period of time after the sensor
detects no document. The document tray motor turns in reverse to lower the document
tray.
A given period of time after the document tray HP sensor switches from OFF to ON, the
document tray motor is turned OFF.
Note: In high speed feeding, the second document is picked up immediately after the end of the first
document passes the front registration sensors (R & L) and both sensors detect no document. In slow
speed feeding, the second document is picked up a given time after both sensors detect no document,
after the end of the first document passes the back registration sensor. Thus, the document feeding
can maintain specific intervals for high speed, medium speed, and slow speed feeding.
2 - 6
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.
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Table 2-102
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Explanation
CANON DR-6080/9080C REV.0 SEPT. 2003