Canon i-SENSYS LBP5300 Series Service Manual

Also see for i-SENSYS LBP5300 Series: User guide User guide

Contents

Chapter 22-6F-2-6The DC controller performs this control. The DC controller divides the oscillation frequency of the oscillator (X1001) and generates the reference clock. It comparesthe 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 betweenone 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 LBP5300The 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 motorThe 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 SYSTEM2.4.1 Overview/Configuration2.4.1.1 Outline 0013-7398/ i-SENSYS LBP5360 / i-SENSYS LBP5300The 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 unitand 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)MDC controller PCBCPUIC1001Scanner motor drive PCB+24VA +24VABD PCBLaser driver PCBScanner driver ICScanner motor/SCNMACC/SCNMDECX1001/BDIFrequencycomparatorReferenceclockOscillatorDrivecircuitIntegrationcircuit