Failure Detection; Laser Scanner Motor Control; Outline - Canon i-SENSYS LBP5300 Series Service Manual

C/Bk Image masking
/BD
T1
Right/Left margin
masking
Scanning direction
2mm
1. The colored area indicates the area where an image can be scanned by the laser beam.
2. The times T1, T2, T3, T4 and T5 depend on the paper size.
3. If the video controller does not specify the paper size with a paper size command at pickup operation from the multi-purpose tray (MPT), the printer cannot detect
the paper width. In such a case, the T1 and T3 are automatically set for letter size but T5 is set according to the paper length detected by the top of page sensor.

2.3.2.3 Failure detection

/ i-SENSYS LBP5360 / i-SENSYS LBP5300
This control is to detect the failure in the laser diode.
The laser driver IC converts the laser current of the laser diodes into voltage value during the initial APC period and sends it to the DC controller in form of the
LASER CURRENT OUTPUT signal.
If the voltage value equivalent to the LASER CURRENT OUTPUT signal is below its specified value, the DC controller presumes the laser unit failure, stops the
printer engine, and notifies the video controller of "E100 (optical unit failure)".

2.3.3 Laser Scanner Motor Control

2.3.3.1 Outline

/ i-SENSYS LBP5360 / i-SENSYS LBP5300
The scanner motor control is to rotate the scanner motor at its specified speed.
There are two PCBs: one is for M/C and the other is for Y/Bk. The PCB for M/C is described here, as both are identical.
The circuit diagram of the scanner motor is illustrated below.
T2
2mm
Y/M Image masking
T2
T4
Scanning direction
2mm
F-2-5
Chapter 2
/BD
T3
Right/Left margin
masking
2mm
0013-7368
0013-7370
2-5