Canon LBP6670dn Series - Outline; Optical Unit Failure Detection

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Technology > Laser Exposure System > Optical Unit Failure Detection
Technology > Laser Exposure System > Optical Unit Failure Detection
Laser Exposure System
Outline
The laser exposure system forms a latent image on the photosensitive drum according to the
VIDEO signalssent from the Main Controller.
The main components of the laser scanner are the laser unit and the scanner motor unit,
which arecontrolled by the signals sent from the DC controller.
Diagram of the Laser Scanner Unit is shown below.
Main controller
DC controller
Engine controller
Scanner mirror
Scanner motor unit
Photosensitive drum
BD sensor
Laser unit
LASER CONTROL signal
VIDEO signal
SCANNER MOT OR SPEED CONTROL signal
BD INPUT signal
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Optical Unit Failure Detection
The optical unit failure detection manages the laser scanner failure detection functions.
The DC controller determines an optical unit failure and noties E100 to the Main controller if
the laser scanner encounters the following conditions:
• If the scanner motor does not reach a specied rotation within a specied period of start-up.
• If the rotation of the scanner motor is out of specied range for a specied period during
drive.
• If an out of specied BD interval is detected during a print operation.