Canon imageRUNNER 1019J Service Manual page 31

3.1.4 DC Controller PCB
Fixing Heater Control Block
The fixing heater control block monitors the temperature reading of the thermistor to ensure that the temperature
of the heater reaches a specific level. If an error is detected in the temperature of the heater, it stops the power
to the heater.
High-Voltage Control Block
The high-voltage control block controls the high voltage for the primary charging roller, developing cylinder of
the cartridge, transfer charging roller, and fixing film.
Drive Control Block
The drive control block controls the main motor, pickup solenoid, and fan.
Sensor Detection
It detects the state of the sensors in the pickup assemblies and the printer block, thereby monitoring the drive
assembly.
Image Processor PCB Interface block
The image processor PCB interface block sends the horizontal sync signal (BD0*) to the image processor PCB.
It also returns a state signal in response to a command signal (serial) from the image processor PCB, thereby
communicating the state of the printer block to the
image processor PCB.
Laser Control Block
The laser control block controls the drive of the laser diode of the laser scanner unit according to the image
signals (VD01, VD01*, VD02, VD02*) from the image processor PCB. Also, it controls the intensity of the
laser diode (auto power control) for each line of print data.
Horizontal Sync Signal Control
When the laser beam reaches the horizontal print start position, the laser beam detection signal (BDI*) from the
laser scanner unit is detected, and the horizontal sync signal (BD0*) is sent to the image processor PCB. Also,
the horizontal sync signal (BD*) is monitored for frequency of output.
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.
Drum Unit Detection Mechanism
In wait state, the CPU on the DC controller PCB measures the voltage level of the cartridge detection signal
(CRGSNS) a specific number of times to check the presence/absence of the drum unit 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.
3.1.5 Analog Processor PCB
Image Processing Control Block
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.
Drive Control Block
The drive control mechanism acts on the reader motor and the ADF motor by the motor drive IC of the analog
processor PCB.
3.1.6 Power Supply PCB
Switching Regulator
Chapter 3
0013-1077
0013-1078
0013-1079