Canon imageCLASS MF5600 Series, Service Manual

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Chapter 2
2-4
When the 4-facet 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.