Canon imageCLASS MF3110 Service Manual - Page 31
BD Fault, Scanner Fault, BD Error
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Chapter 2 The leaser beam reflected by the 4 facet mirror moves through the imaging lens arranged in front of the 4 facet mirror and the reflecting mirror to reach and focus on the photosensitive drum. 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. 2-3