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CHAPTER 4 OPERATION
Scanner Motor Control
The scanner motor is controlled so that the horizontal resolution of the print image is 600
dpi. Also, the laser beam detection signal (BDI*) from the laser scanner unit is detected to
monitor the rotation of the scanner motor.
Cartridge Detection Mechanism
In wait state, the CPU on the DC controller PCB measures the voltage level of the car-
tridge detection signal (CRGSNS) a specific number of times to check the presence/absence
of the cartridge when an AC bias is applied to the primary charging roller.
Toner Level Detection Mechanism
While the machine is in wait state, the toner level detection signal (ADDTNR; based on
the comparison of the developing bias output and the antenna output inside the cartridge)
occurring when the developing AC bias is detected during normal rotation to monitor the
toner level inside the cartridge.
1.3.2.3 Control Panel PCB
Key Detection and LCD/LED Drive
The keys are monitored, and the LCD and LEDs are driven.
LCD Function
The LCD consisting of 2 lines of 20 characters is controlled according to the display sig-
nals from the image processor PCB.
Serial Communication Control
The state of the control keys is monitored based on serial communications with the image
processor PCB. LCD and LE drive data are received.
1.3.2.4 Power Supply PCB
Switching Regulator
The following is generated using power from the power outlet for loads: +24 DC, +12
VDC, +5 VSDC, +5 VDC, +3.3 VSDC, +3.3 VDC.
1.3.2.5 Analog Processor PCB
The analog image data read by the contact sensor is converted into digital image data and
sent to the ASIC of the image processor PCB.
1.3.2.6 Sensor PCB
The signals from the copyboard open/closed sensor and the contact sensor home position
sensor are sent to the image processor PCB.
4-8
COPYRIGHT © 2001 CANON INC.
Chapter4.p65
CANON imageCLASS D600s/PC1060s/PC1200s/iR1200s REV. 0 SEPT. 2001
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8/26/01, 3:44 PM
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Table of Contents
Troubleshooting
