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18 ADF unit explanation ENWW
2 Signals
a Input signals
1 DF_SD1_CONT (PRCB to SCDB)
SD301 ON/OFF control signal
[L]: SD301 on
[H]: SD301 off
2 DF_SD2_CONT (PRCB to SCDB)
SD302 ON/OFF control signal
[L]: SD302 on
[H]: SD302 off
3 DF_SD3_CONT (PRCB to SCDB)
SD303 ON/OFF control signal
[L]: SD303 on
[H]: SD303 off
b Output signal
1 DRIVE (SCDB to SD301)
SD301 ON/OFF drive signal
[L]: SD301 on
[H]: SD301 off
2 DRIVE (SCDB to SD302)
SD302 ON/OFF drive signal
[L]: SD302 on
[H]: SD302 off
3 DRIVE (SCDB to SD303)
SD303 ON/OFF drive signal
[L]: SD303 on
[H]: SD303 off
Original size detection control
The size of the original placed in the original
feed tray is detected by PS309 (original
size/2), PS310 (original size/1), and VR301
(original size VR).
Each of these features is controlled by
PRCB (printer control board) and driven by
SCDB (scanner drive board).
1 Operation
a Normal copy mode
PRCB detects the original size from the
combination of the following signals:
1 Drum axis direction size detection
A guide plate is connected to VR301
(original size VR) and the resistance
value varies with the position of the
guide plate. This is used to determine
the vertical dimension of the original.
2 Original feed direction size detection
The horizontal dimension of the
original is detected with the on/off
combination of PS309 (original size
/2) and PS310 (original size PS/1).
b Mixed/Z-fold copy mode original size
detection
Size detection during mixed and Z-fold
copy modes are performed as follows:
1 Drum axis direction size detection
The vertical dimension of the largest
original is determined by the position
of the guide plate.
VR301
PS309
PS310
SCDB
DCPS
24V2
P.GND
5V2
S.GND
PRCB
3.3V
S.G
PS304_SIG
PS309_SIG
PS310_SIG
VR301_SIG
5V
SIG
S.G
PS304
5V
SIG
S.G
5V
SIG
S.G
3.3V
SIG
S.G