Canon imageCLASS X LBP1238, Service Manual

Page: 36 / 220

Laser Exposure System
Functional Configuration
Overview
The laser exposure system forms a static latent image on the Photosensitive Drum by laser exposure.
Description
The Laser Scanner Unit consists of the Laser Unit and the Scanner Motor Unit, and is controlled by the signal input from the DC
Controller.
DC Controller PCB
Main Controller PCB
SC
AN
N
ER
MO
T
O
R
S
P
E
E
D
C
O
N
T
R
O
L
si
g
n
a
l
L
A
S
E
R
C
O
N
T
R
O
L
si
g
n
a
l
VI
D
EO
si
g
n
a
l
BD
I
N
PU
T
si
g
n
a
l
Scanner Mirror
BD Sensor
Scanner Motor Unit
Photosensitive Drum
Laser Unit
Shutter Control
The Laser Scanner Unit of this machine has the laser shutter mechanism.
The Laser Shutter blocks laser path of the Laser Scanner Unit when the Front Cover is opened for the safety of users and
service technicians.
Failure Detection
Overview
The DC Controller detects the following failures in the Laser Scanner Unit.
• Scanner area failure
• Scanner Motor failure
Description
Scanner area failure detection
If an error in any of the Scanner Motor, Laser Unit, or BD detection in the scanner area is detected, an error code is notified.
2. Technical Explanation (Device)
26