2 - L - 17
PAPER FEED UNIT
The size of the paper in the upper tray is detected as a result
of the matrix circuit in the CB (control board) detecting the
signal from the paper size detection board. The size of paper
in the by-pass feed tray is detected by the CB according to the
combination of PS22 (by-pass feed paper size detection) and
VR1 (by-pass paper size detection).
1. Operation
a. Tray (upper) paper size detection
The paper size detection board has four switches which
detect the position of the rear guide in the tray (upper). The
paper size is detected according to the particular ON-OFF
combination of these switches.
TMP 1
TMP 2
0
1
2
3
SGND
PS22
5VDC
VR1
60-B1
60-B2
60-B3
60-B4
60-B5
60-B6
7-B11
144-1
7-A11
144-3
CB
PAPER SIZE
RETURN
PAPER SIZE
DETECTION
BOARD
PS22
462-1
462-2
462-3
VR1
465-3
465-2
465-1
[6] Paper Size Detection Control
b. Output signals
(1) M17 DRIVE (CB → M17)
M17 drive control signal
[L]: M17 ON
[H]: M17 OFF
(2) M18 DRIVE (CB → M18)
M18 drive control signal
[L]: M18 ON
[H]: M18 OFF
D
ON
ON
ON
OFF
OFF
OFF
OFF
C
OFF
OFF
OFF
ON
ON
ON
OFF
B
OFF
OFF
ON
ON
OFF
ON
ON
A
OFF
ON
OFF
OFF
OFF
ON
OFF
Paper size
A3/11" × 17"
B4/8
1
/
2
" × 10"
A4/8
1
/
2
" × 11"
B5/8
1
/
2
" × 5
1
/
2
"
B6
A4R/8
1
/
2
" × 11"R
B5R/8
1
/
2
" × 5
1
/
2
"R
The relation between the state of the switches on the paper
size detection board and the paper size is shown below.
b. Tray (lower) paper size setting
The size of paper in the tray (lower) is set in the 25 mode.
(Refer to the Adjustment section.)
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