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ENWW Automatic duplex unit (ADU) 101
MFP unit explanation
Loop/second paper feed control
The paper fed from each tray is fed to the
second paper feed section. The second
paper feed takes place as the result of the
transmission of the drive force from M5
(conveyance) to the second pick roller via
MC1 (registration). The second paper feed
section is preceded by a loop roller used to
form a paper loop, and this conveyance
section is also used for the paper fed from
the HCI. It is not used for the paper fed from
Tray 1 or the ADU. The loop roller is driven
by M6 (loop roller). The above parts are
controlled by PRCB (printer control board)
via ADUDB (ADU drive board). M6 is driven
by PRCB directly.
Related signals are PS36 (loop), PS43
(leading edge), PS44 (registration), and
PS50 (ADU pre-registration).
1 Operation
a Loop control
After a lapse of the specified time from
turning on of PS44 (registration) by the
paper fed from each tray or the ADU at
ADUDB
M5
M6
PS50
+5V
PGND
START/STOP
CLK
CW/CCW
LD
H/L
PGND
+24V
24V
24V
A
/A
B
/B
5V2
ADUEXT PS
S.GND
PS70
DEF VIDEO
GMD
5V2
-5V
GND
DEF SI
DEF CLK
DEF LED
24V1
PRCB
IO DTXD
IO DCLK
ADU LATCH
IO UCLK
REQ1
IO URXD
ACK1
ERR OUT1
2NDM CLK
REG PS
PS44
5V2
2ND PS
S.GND
PS43
MC1
PS36
5V2
EDGE PS
S.GND
MC24V
2ND MC
5V3
LOOP PS
S.GND
DCPS
24V1
5V2
S.GND
P.GND
-5V1
5V2
24V1
S.GND