Canon NP2120 - Page 63

OPERATIONS AND TIMING
3. Identification of Document Size
The DC controller identifies the size of docu-
ments based on the levels of the output from the
document identification circuit; see Table 3-3.
r r
- - - Dccument identification cir
Document identification circuit
11
121 Ix4 I
constant ) vatying ) constant 1
3
A4
constant constant varying
I I I I
constant varying
=l=
vafying
varying
varying
varying
varying
4
constant
vafying
constant: no change to output of document identi-
fication circuit; recognizes resence of
document.
varying: change to output of document identifica-
tion circuit; recognizes absence of docu-
ment.
Table 3-3
v
Document identification circuit t
p ’ -l-& __~
Document identificatlon signa1 1 (DSZl)
Dccument identification
signa1 0 (DSZO)
Dccument Identilication signa1 2 (DSZ2)
t
I 1
DC conlroller PC6
Copybard MVW signa1 2 (CSCC2)
Figure 3-21
CUPVAIGHT 0 1992 CANON ING.
CANON NPZl20/2MO RN.0 MAV 1990 PRINTEO IN JAPAN IIMPRIME AU JAPONI d
3-23