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
A4
A3
Document identification
signal 1 (DSZ1)
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Document
Size
A3
A4
A4R
A5R
Document identification circuit 1
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
Document identification circuit
0
constant constant
varying constant
constant varying
varying varying
Table 3-303
Phototransistor LED
A4
A4R
A5R
Document identification circuit 0
Copyboard cover signal 1 (CBCC1)
Copyboard cover signal 2 (CBCC2)
1
SW4
A3
SW5
3-13