Canon DADF-M1, Service Manual

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Chapter 2
2-21
2.3
Document Detection
2.3.1 Overview
0002-7374
The machine possesses the following 2 modes of operation to suit different printing modes:
a. normal mode (other than mix of different configurations or extra-length)
T-2-3
b. Mix of Different Configurations/Extra-Length
If the originals are of different configurations or are of extra length, the following 3
detection mechanisms are used:
Item Description Sensor used
(notation)
Presence/
absence of
original checks the presence/absence of an original in the
original pickup tray. original
placement
sensor
Original size identification
Feed
direction monitors the state of the post-separation sensor (on/
off) after the read sensor goes on to identify the
original as being small or large. post-separation
sensor, read
sensor
checks the length of the original placed in the
original pickup tray; identification of LTR and LGL. LGL sensor
Cross-feed
direction checks the width of the original placed in the original
pickup tray. original width
volume (VR1)
identification between A4R/A5R and LTRR/
STMTR AB/inch sensor