Canon I-Sensys LBP5050, Руководство по обслуживанию

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Chapter 2
2-2
2.3 LASER EXPOSURE SYSTEM
2.3.1 Overview/Configuration
2.3.1.1 Outline
0018-6525
LBP5050N / LBP5050
The laser scanner system forms the latent image on the photosensitive drum according to the VIDEO signals sent from the main controller.
The main components of the laser scanner unit are the laser driver and the scanner motor unit and are controlled by the signals sent from the DC controller.
F-2-2
2.3.2 Laser Scanner Motor Control
2.3.2.1 Fault Detection
0018-6527
LBP5050N / LBP5050
1. Scanner motor failure
- The scanner motor does not reach a specified rotation within a specified period after starting-up the laser scanner motor.
- The rotation of the scanner motor is out of specified range for a specified period during scanner motor drive.
2. BD failure
- The BD interval is detected at out of a specified value during a print operation.
Scaner motor unit
Photosensitive drum
(Y)
BD circuit
Laser driver
LASER CONTROL signal VIDEO signal SCANNER MOTOR SPEED CONTROL signal BD INPUT signal
Polygon mirror
Photosensitive drum
(M)
Photosensitive drum
(C)
Photosensitive drum
(Bk)
Main controller
DC controller