Canon imageCLASS MF3111, Руководство по обслуживанию

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Chapter 2
2-3
The leaser beam reflected by the 4facet mirror moves through the imaging lens arranged in front of the 4facet mirror
and the reflecting mirror to reach and focus on the photosensitive drum.
When the 4facet mirror rotates at a specific speed, the laser beam scans the photosensitive drum in keeping with the
mirror rotation, thus drawing static images on the photosensitive drum.
Memo:
BD Fault
The machine identifies a BD fault if it does not detect the /BDI signal within 0.1 sec after the scanner motor is
forced to accelerate. It also detects a BD fault if it does not detect a specific interval of /BDI signals for 2 sec
continuously after the scanner motor has reached a specific revolution (number of rotations).
Scanner Fault
If the machine does not detect the /BDI signal 1.4 sc after it has stopped forcing the scanner motor to accelerate,
it extends the period of detection by 120 sec; if it still does not detect a specific interval of /BDI signals, it
identifies a scanner fault.
BD Error
The machine identifies a BD error if it does not detect the /BDI signal at a specific interval while the /BDI signal
is being generated. It, however, does not identify a BD error under the following condition:
the door is identified as being open within 0.2 sec after detection of a BD error.
a BD fault or a scanner fault is detected after a BD error has been identified.
The laser/scanner unit contains parts that cannot be adjusted in the field. Do not attempt to disassemble the laser/
scanner unit.