Canon iR1020 Series, Service Manual

Page: 69 / 304

Chapter 3
3-3
2. Construction
The image processor comes in different ROM types/sizes and RAM sizes according to models.
The firmware stored in the flash ROM may be either SYSTEM or BOOT.
Using the service support tool, the following 3 types of firmware may be upgraded: SYSTEM and BOOT stored in the flash ROM and the firmware stored ion PCL
ROM.
F-3-3
3.1.4 DC Controller PCB
0013-1077
iR1020J / iR1024J / iR1020 / iR1024 / iR1024A / iR1024N / iR1024F / iR1024i / iR1024iF
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 com-
mand 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.
CPU
Image processor PCB
DDR-SDRAM (256MB)
USB MEMORY (128MB)
Flash ROM (16MB)
PCL ROM (16MB)
<with SEND functions, with printer functions>
CPU
Image processor PCB
DDR-SDRAM (128MB)
Flash ROM (16MB)
<w/o SEND functions, with printer functions>
CPU
Image processor PCB
DDR-SDRAM (64MB)
Flash ROM (12MB)
<w/o SEND functions, w/o printer functions>