Scanner Motor Fault Detection - Canon LBP3250 Series Service Manual

Chapter 2

2.3.4.2 Scanner Motor Fault Detection

This 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 controller judges it as a fault in the laser scanner unit system and notices the
status of fault to the main controller.
The operations of the host machine are stopped.
1. Fault in BD input
At startup of the scanner, /BDI signal cannot be detected within 0.1 sec from the completion of forced acceleration of the scanner motor.
2. Fault in startup
During activating the scanner motor at startup of the scanner, the motor rotation exceeds the specified range (98.3 to 102.1%).
3. Fault in control
After startup of the scanner completes correctly, /BDI signal exceeds the specified value of cycle 10 consecutive times.
2-6
0019-9514