Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 39 page image

22 2-142-14Technical Overview > Laser Exposure System > Service Works > Notes on service worksTechnical Overview > Laser Exposure System > Service Works > Notes on service works■ Scanner Motor Fault DetectionThis is the detection of faults in the laser scanner unit.When the laser unit scanner unit falls into either of the following status, the engine controllerjudges it as a fault in the laser scanner unit system and notices the status of fault to the maincontroller.The operations of the host machine are stopped.1. Fault in BD inputAt startup of the scanner, /BDI signal cannot be detected within 0.1 sec from the completionof forced acceleration of the scanner motor.2. Fault in startupDuring activating the scanner motor at startup of the scanner, the motor rotation exceedsthe specified range (98.3 to 102.1%).3. Fault in controlAfter startup of the scanner completes correctly, /BDI signal exceeds the specified value ofcycle 10 consecutive times.Service Works■ At parts replacementNo work is required for this product at parts replacement.■ MaintenanceNo periodically replaced parts, durable parts or periodical service is set for this product.■ Notes on service worksNone.