2. Relationship between the Scanner Sensor and Signals
I
II
1 Reference used to determine the forward
Scannerhome
It I
travel distance.
position sensor
SCHP
I I
PSI) II I
The scanner stops traveling in reverse in
1 L IO.1 sec.
Table 3-201
3. Basic Sequence of Scanner Operations
Power switch
Copy Start key
ON
ON
@Vj : reverse
0 : detects scanner home position
(3 : 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 0 1995 CANONINC.,
CANON NP6012/NP60i2FINP6212 I7EV.i SEPT.1995 PRlNTEDINJAPAN(IMPAIM~AUJAPON)
3-15
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