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'
\
3. OPERATIONS
AND TIMING-
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 3-4.
Document
Document identification circuit
Size
',
0
i
A3
constant
constant
A4
varying
constant
A4R
constant
varying
A!%
varying
varying
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.
Table 3-4
Phototransistor
LED
\
I
Document
identification
signal 1 (DSZl)
t
Document
identification
signal 0 (DSZO)
I
V
~
A4
I
,
A4R
A3
+5fl
ib
@Ii
Document
/dentification
circull 0
Document
identification
circuit
1
t
14.
_
___
. _
9
I
DC controller
PCB
Copyboard
MYW signal 1 (CBCCl)
Figure 3-19
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