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OPERATIONS AND TIMING Ba
2.
Relationship between the Scanner Sensor and Signals
Reference used to determine the forward
Scanner home
travel distance.
Position sensor
(PS1)
The scanner stops traveling in reverse in
0.1 sec.
Table 3-201
3.
Basic Sequence of Scanner Operations
Power switch
Copy Start key
ON
QN
L_INTR [ SCEW |SCRV]"SCEWTSCAV
[CSTR]
Registration sensor (Q751)}+-————______,
CO
a
a
om
on
ZA
om
Pema | |
|
|_|
|
LLSTR [STBYS
Scanner home position
sensor (PS1)
Scanner
Scanner lamp (FL1)
YZ: reverse
@® : detects scanner home position
@ : detects lens home position
Figure 3-205
The microprocessor on the DC controller PCB controls the forward travel distance of the
scanner with reference to the rising edge of the scanner home position signal. The forward trav-
el distance varies depending on the length of copy paper" and the selected reproduction ratio in
ENLARGE: if the ratio is less than 130%, the scanner is moved forward for A4 (297 mm); if the
ratio is 130% or more, the scanner is moved for LTR (279 mm).
"For a discussion of how the length of copy paper is checked, see p. 3-49.
COPYRIGHT © 1995 CANORINC.
CANON NP6O12/NPGO12F /NP6212 REV.1 SEPT. 1995 PRINTED
IN JAPAN (IMPRIME AU JAPON}
3-15
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