Canon CP660 Service Manual page 168

CHAPTER 5 PICK-UP/FEEDING SYSTEM
2. Detecting the Presence/Absence of a Cassette, Cassette Size, and Paper Level
The presence/absence of the cassette 1 or 2 is checked by the cassette 1 sensor
(PS1202) or the cassette 2 sensor (PS1201), and the presence/absence of paper is
checked by the cassette 1 paper absent sensor (PS1208) or the cassette 2 paper absent
sensor (PS1207).
The size of the paper inside the cassette 2, further, is identified by the four sensors
each mounted to the cassette 1 and the cassette 2; i.e., cassette 1 or cassette 2 size
detecting switches (SW1601 through SW1604). Table 5-201 shows combinations of the
states of the cassette size detecting switches.
Paper size
The level of paper inside the cassette is checked in relation to the position of the lifter
used to move up the stack of paper. The lifter is equipped with a light-blocking plate, and
the position of the lifter is checked when the light-blocking plate blocks two sensors,
thereby enabling the identification of the level of paper.
In the case of the cassette 1, the outputs of the cassette 1 paper levels sensor 1
(PS1205) and the cassette 1 paper level sensor 2 (PS1206) are used; in the case of the
cassette 2, on the other hand, the outputs of the cassette 2 paper level sensor 1
(PS1203) and the cassette 2 paper level sensor 2 (PS1204) are used. Figure 5-204
shows the combinations of the states of PS1205 and PS1206 (or, of PS1203 and
PS1204).
5-6
COPYRIGHT © 1999 CANON INC.
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SW1601
11 × 17
A3
B4
LGL
LTRR
A4R
A4
B5R
A5R
Table 5-201
Cassette size detecting switch
SW1602 SW1603
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF OFF
ON OFF
OFF ON
OFF OFF
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
SW1604
OFF OFF
OFF OFF
OFF OFF
OFF OFF
OFF ON
ON OFF
OFF ON
OFF ON
ON ON