Canon i-SENSYS LBP5300 Series, Руководство по обслуживанию

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Chapter 2
2-6
F-2-6
The DC controller performs this control. The DC controller divides the oscillation frequency of the oscillator (X1001) and generates the reference clock. It compares
the intervals between the reference clock and the BD INPUT signal (/BD1I) with the frequency comparator, and monitors the rotational count of the scanner motor.
The DC controller controls the rotational speed by sending the SCANNER MOTOR ACCELERATION signal (/SCNM1ACC) or the SCANNER MOTOR DE-
CELERATION signal (/SCNM1DEC) to the scanner motor driver circuit based on the detected rotational speed.
The following are the two controls performed in this control.
1. Speed control: This control is to maintain the rotational speed of the scanner motor at constant speed.
2. Phase control with other scanner: This control is to prevent the color misregistration in sub-scanning (vertical) direction. It adjusts the phase difference between
one Polygon mirror and the other during both scanner motors' rotation at low speed and eliminates the rotational difference between both scanner motors.
2.3.3.2 Failure detection
0013-7371
/ i-SENSYS LBP5360 / i-SENSYS LBP5300
The CPU monitors the frequency comparator in the ASIC and determines whether the scanner motor rotates at its specified rotational speed or not.
When the CPU encounters the following conditions, it determines the scanner motor failure, stops the printer engine, and notifies the video controller of "E100
(optical unit failure)".
1. Abnormal scanner motor
The scanner motor does not enter scanner ready mode within 5 seconds of scanner motor start-up.
2. BD error
- The /BDI signal cannot be detected within 1.5 seconds of once the scanner motor reached at its specified rotational speed.
- The interval of the /BDI signal goes out of the tolerance for 0.5 second continuously after the scanner motor once reached at its specified rotational speed.
2.4 IMAGE FORMATION SYSTEM
2.4.1 Overview/Configuration
2.4.1.1 Outline
0013-7398
/ i-SENSYS LBP5360 / i-SENSYS LBP5300
The image formation system serves as an essential part of the printer and forms a toner image on paper.
It consists of the four cartridges, the ETB unit, the fixing unit, and etc, which are controlled by the DC controller. The DC controller controls the laser/scanner unit
and the high-voltage power supply PCB to form an image on paper according to the VIDEO signals upon reception of the print command from the video controller.
There is a memory tag inside each cartridge. The memory tag reads and writes data according to the command from the DC controller.
ASIC (IC1010)
M
DC controller PCB
CPU
IC1001
Scanner motor drive PCB
+24VA
+24VA
BD PCB
Laser driver PCB
Scanner driver IC
Scanner motor
/SCNMACC
/SCNMDEC
X1001
/BDI
Frequency
comparator
Reference
clock
Oscillator
Drive
circuit
Integration
circuit