- HP Printer User Manual

ENWW Laser scanner unit 55
MFP unit explanation
b) Sub scanning direction
Specified interval after PS44
(registration) detects the leading edge
of the copy paper.
2 Signals
a Input signals
1 /IND (INDXSB to ICB)
This is an index signal used to detect
deviation of main scanning.
2 /INDPR (INDXSB to ICB)
This signal monitors the INDXSB
(index sensor board) power supply.
[H]: Abnormal
[L]: Normal
3 /ALM1 (LDB to ICB)
This signal indicates the state of the
laser 1 drive current.
[H]: Normal
[L]: Abnormal
4 LPR5V (LDB to ICB)
This signal monitors the LDB (laser
driver board) power supply.
[H]: Normal
[L]: Abnormal
5 /ALM2 (LDB to ICB)
This signal indicates the state of the
laser 2 drive current.
[H]: Normal
[L]: Abnormal
b Output signals
1 /S/H1 (ICB to LDB)
APC sampling signal for one line (for
laser 1)
2 /ENB1 (ICB to LDB)
Laser APC function ON/OFF control
signal (for laser 1)
Laser beam emission stops when it is
off.
3 /S/H2 (ICB to LDB)
APC sampling signal for one line (for
laser 2)
4 /ENB2 (ICB to LDB)
Laser APC function ON/OFF control
signal (for laser 2)
Laser beam emission stops when it is
off.
5 VIDEO1/VIDEO1 (ICB to LDB)
Image signal for laser 1
6 VIDEO2/VIDEO2 (ICB to LDB)
Image signal for laser 2
DACLK (ICB to LDB)
LDB (laser driver board) MPC value
data transmission clock signal
7 DADI (ICB to LDB)
LDB (laser driver board) signal for
MPC
8 DALD (ICB to LDB)
LDB (laser driver board) MPC value
memory command signal