Canon NP6320 Service Manual page 53

3. Identification of Document Size
The DC controller identifies the size of documents based on the levels of the output from the
document identification circuit; see Table 3-303.
constant: no change to output of document identification circuit; recognizes presence of document.
varying: change to output of document identification circuit; recognizes absence of document.
V
A5
R
A4
R
Document identification circuit 1
A4
A3
Document identification
signal 1 (DSZ1)
COPYRIGHT © 1999 CANON INC.
Document identification circuit
Document
Size 0
A3 constant
A4 varying
A4R constant
A5R varying
Table 3-303
Phototransistor LED
A4
A5R
Document identification signal 0 (DSZ0)
DC controller PCB
Figure 3-307
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
1
constant
constant
varying
varying
A4R
Document identification circuit 0
Copyboard cover signal 1 (CBCC1)
Copyboard cover signal 2 (CBCC2)
SW4
A3
SW5
3-13