C. Scanner Drive System
1. Outline
The scanner is moved forward or in reverse by
changing the direction of rotation of the scanner
motor (M2).
The speed of rotation of the scanner motor
when moving the scanner forward varies accord-
ing to the selected reproduction ratio.
The speed of rotation of the scanner motor
when moving the scanner in reverse is about 3.9
times as fast as when moving the scanner forward
in Direct mode regardless of the selected repro-
duction ratio.
However, brakes are applied as soon as the
signal plate reaches the photointerrupter (Q4)
and the scanner is stopped. (The photointerrupter
Q5 is used to make sure that the scanner has
stopped at home position.)
If the RDF is used for stream reading, the
scanner leading edge 2 sensor (Q38) is used to
find out whether the No. 1 mirror mount of the
scanner has reached a specific point.
The distance over which the scanner moves
varies according to the copy size and the select-
ed reproduction ratio.
If 157% is specified as the reproduction ratio,
part of some originals may not show on the copy.
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-34
M
Scanner C.F.F. position signal
(SCFFP)
Scanner C.F.F.
position sensor
(Q6)
Scanner home
position sensor(Q5)
Scanner motor(M2)
Scanner original leading
edge 1 sensor(Q4)
Q4 Signal plate
Q5 Signal
plate
Scanner original leading
edge 2 sensor(Q38)
Q6
Signal plate
No. 1 mirror mount
No. 2/No. 3
mirror mount
Forward
DC controller PCB
Scanner home position signal (SCHP)
Scanner original leading edge 1 signal
(SCDP1)
Scanner original leading edge 2 signal
(SCDP2)
Figure 3-207
Содержание NP6085
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Страница 498: ...COPYRIGHT 1996 CANON INC CANON NP6085 REV 0 JULY 1996 PRINTED IN JAPAN IMPRIME AU JAPON A 5 ...
Страница 502: ...PRINTED IN JAPAN IMPRIME AU JAPON 0697AB0 6 3 This publication is printed on 70 reprocessed paper ...