5 - 11
2. Signals
a. Input signals
(1) PS301 (PS301 → RADF CB)
Original detection signal at the paper feed roller entrance
[L]: Original exists.
[H]: Original does not exist.
(2) PS304 (PS304 → RADF CB)
Signal which detects that the paper feed tray is empty
[L]: Original exists.
[H]: Original does not exist.
(3) PS305 (PS305 → RADF CB)
Paper feed original detection signal
[L]: Original exists.
[H]: Original does not exist.
(4) PS309 (PS309 → RADF CB)
Signal which detects that the original push pressure
plate is in the home position
[L]: In home position.
[H]: Not in home position.
(5) PS310 (PS310 → RADF CB)
Signal which detects a paper size of A5R/5
1
/
2
" × 8
1
/
2
"
[L]: A5R/5
1
/
2
" × 8
1
/
2
"
[H]: Original does not exist.
(6) DFRXD (MAIN BODY → RADF CB)
Serial data line which transmits the operation status of
the main body CB to the RADF
(7) DFREQ (MAIN BODY → RADF CB)
RADF operation start request signal
b. Output signals
(1) M301 DRIVE A, A, B, B (RADF CB → M301)
M301 (paper feed) ON/OFF drive signal
(2) M304 DRIVE (RADF CB → M301)
M304 (push pressure) ON/OFF drive signal
[L]: M304 ON
[H]: M304 OFF
(3) TXD (MAIN BODY → RADF CB)
Serial data line which transmits the operation status of
the RADF to the CB.
(4) ACK (MAIN BODY → RADF CB)
Clock signal for signal synchronization when
communication is taking place between the RADFCB
and the main body CB.
RADFCB
103-A1
103-A2
103-A3
103-A4
103-A5
103-A6
103-B8
103-B10
104-A1
104-B1
102-1
104-A4
104-B4
102-4
104-A5
104-B5
102-5
104-A9
104-B9
102-9
104-A10
104-B10
102-10
101-1
101-2
101-4
101-5
101-6
101-7
101-8
101-9
24VDC
24VDC
M301 DRIVE A
M301 DRIVE A
M301 DRIVE B
M301 DRIVE B
24VDC
M304 DRIVE
5VDC
SGND
PS301
5VDC
SGND
PS304
5VDC
SGND
PS305
5VDC
SGND
PS309
5VDC
SGND
PS310
PS301
PS304
PS305
PS309
PS310
M301
M304
100-11
100-12
100-10
100-6
100-1
100-8
100-3
1007
24VDC
PGND
5VDC
SGND
DF TXD
DF ACK
DF RXD
DF REQ
CB
[4] Paper Feed Control
Paper feed takes place as a result of the transfer of drive force
from M301 (paper feed) to the paper feed roller and the feed
roller. M301 is controlled by the RADFCB (RADF control
board).
1. Operation
a. Original pressing operation
When the RADF receives a control signal from the main
body, M304 (push pressure) goes ON, and the original
starts to be pressed against the paper feed roller by the
original push pressure plate. When PS301 (original set)
goes ON → OFF (light cutoff → transmission), M304 stops.
The original push pressure plate pressing/release operations
take place for each original.
b. Paper feed operation
When PS309 (up/down) goes ON, M301 goes ON after the
specified period, and the paper feed operation starts. (pre-
paper feed)
PS305 (paper feed) detects the leading edge of the original
as a result of M301 going ON, then after the specified period
M301 rotates in reverse, and the original is conveyed onto
the platen glass. (re-paper feed)
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