Canon LBP-1120 Service Manual page 25

CHAPTER 2
3. Engine Controller Input and Output
Laser/scanner unit
M801
Scanner
motor
Scanner
motor driver
circuit
Laser diode
Laser driver
circuit
BD circuit
Main motor
J007-4
M001
Paper top sensor
Paper-out sensor
2 - 6
J802-1 J208-4
-3
-2
-4
J801-8 J208-5
-1
-6
-5
-4
-3
-2
-7
J401-1
-3
-2
-1
PS002
J003-3 J211-1
-1
-2
PS003
J211-4
J004-3
-1
-2
Figure 2-2-2
Engine controller PCB
+24V
-2
"L" decelerates the scanner motor .
/DEC
-3
/ACC "L" accelerates the scanner motor .
-1
+5V
+3.3V
-12
-7
VDO
Video signals
-8 /VDO
-9
CONT1
Control the laser diode.
-10
CONT0
-11
BD input signal
/BDI
-6
/MB
-2
MB
Main motor drive signals
-3
/MA
MA
-4
+5V
-3
/PISNS
"L" when the leading edge of the
-2
paper is detected.
+5V
PAPERSNS
-6
"L" when paper is present in
-5
the multi-purpose
manual feed slot.
PS201
Paper delivery
sensor
tray or the
"L" when paper
is detected.