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OPERATIONS AND TIMING
J. Original Size Detection
Control
1. Outline
The machine offers auto paper selection, auto
reproduction selection, reduction layout, and en-
largement layout functions, all of which require the
identification of the size of the originals being used.
To identify the size, the machine has two to four
original size sensors under its copyboard glass
which check the presence/absence of an original
3–24
A4
DC controller PCB
Figure 3-123 (A configuration)
COPYRIGHT © 1998 CANON INC.
when the copyboard cover is closed and identify the
original as being any of the default paper sizes.
Each original size sensor consists of a LED and
a phototransistor: the LED illuminates the original,
and the photodiode receives the reflected light and
sends the output to the DC controller circuit.
The size of originals in the DF (option) is identi-
fied by the DF and communicated to the machine.
When the DF is used, the machine executes auto
paper selection, auto reproduction selection, re-
duction layout, and enlargement layout based on
this size data.
Copyboard cover open/
closed sensor
A4R
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
PS11
A3
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