COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001
4-7
CHAPTER 4 OPERATION
Speaker Control (if equipped with fax functions.)
It turns on/off or control the volume of the error sound, key sound, and line monitor
sound generated by the speaker.
Memo
The volume of the line monitor or the sound of the key sound or the error
sound is adjusted in user mode.
Communication Control Block (if equipped with fax functions)
The communication control block detects line signals (CNG, DTMF). The 14.4-kps mo-
dem is controlled by the main CPU on the image processor PCB for modulation and de-
modulation of transmission/reception data. It also is used to send the DTMF signal.
1.3.2.2 DC Controller PCB
Fixing Heater Control Block
The fixing heater control block monitors the temperature reading of the thermistor to en-
sure 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 ac-
cording to the image signals (VD0, VD0*) from the image processor PCB. Also, it controls
the intensity of the laser diode (auto power control) for each line of print data.
