- HP Printer User Manual

ENWW Automatic duplex unit (ADU) 103
MFP unit explanation
7 CW/CCW (ADUDB to M5)
M5 (conveyance) rotational direction
indication signal
[L]: CCW
[H]: CW
8 H/L (ADUDB to M5)
M5 (conveyance) rotational speed
indication signal
[L]: Low speed
[H]: High speed
9 A, /A (PRCB to M6)
M6 (loop roller) A-phase drive control
pulse signal
10B, /B (PRCB to M6)
M6 (loop roller) B-phase drive control
pulse signal
Paper conveyance control
The paper fed from the second paper feed
section is fed to the fuser unit by the
pre-transfer roller and conveyance belt
driven by M5 (conveyance). In the
conveyance section, paper suction is
provided by FM3 (conveyance suction)
through the duct installed on the back of the
conveyance belt. M5 and FM3 are controlled
by PRCB (printer control board) via the
ADUDB (ADU drive board).
1 Operation
a M5 (conveyance) operation
M5 (conveyance) starts when the
START button is pressed, and it stops
when the PS37 (paper exit) turns off at
detection of the trailing edge of the last
sheet of paper.
b FM3 (conveyance suction) operation
FM3 is turned on/off in sync with M2
(drum).
2 Signals
a Input signals
1 MAINEXIT_PS (PS37 to PRCB)
MFP exit section paper passage
detection signal
[L]: Detected
[H]: Not detected
2 SUC_EM (FM3 to ADUSDB)
FM3 (conveyance suction) fault
detection signal
[L]: FM3 is normal
[H]: FM3 is abnormal
b Output signal
1 MAINEXIT_PS (ADUDB to FM3)
FM3 (conveyance suction) drive
signal
[L]: FM3 off
[H]: FM3 on
ADUDB
M5
FM3
+5V
PGND
START/STOP
CLK
CW/CCW
LD
H/L
PGND
+24V
PRCB
IO DTXD
IO DCLK
ADU LATCH
IO UCLK
REQ1
IO URXD
ACK1
ERR OUT1
2NDM CLK
PS37
5V
MAINEXIT PS
S.GND
DCPS
24V1
5V2
S.GND
P.GND
5V2
24V1
S.GND
SUC FAN
SUC EM
P.GND
24V2
P.GND
MS1
MS2