Canon iR1600 Series, Service Manual

Page: 100 / 738

CHAPTER 2 BASIC OPERATION
COPYRIGHT© 2002 CANON INC. 2000 CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
2 - 4
d. Sensor Detection Mechanism
The sensor detection mechanism is used to check the sensor state of the printer unit and
pickup assembly to monitor the drive mechanism.
e. Image Processor PCB Interface Mechanism
The image processor PCB interface mechanism sends the horizontal sync signal
(BDO*) to the image processor PCB. Also, it returns status signals in response to the
command signal for serial communications coming from the image processor PCB to
communicate the state of the printer unit to the image processor PCB.
f. Laser Control Mechanism
The laser control mechanism controls the drive of the laser diode of the laser scanner
unit according to the print data from the image processor PCB. Also, it performs laser
power auto control (auto power control) for each line of print data.
g. Horizontal Sync Signal Control Mechanism
When the laser beam reaches a print start point for horizontal direction, the BD input
signal (BDI*) coming from the laser scanner unit is detected, and the horizontal sync sig-
nal (BDO*) is sent to the image processor PCB. Also, the output of the scanner motor is
monitored in relation to the horizontal sync signal (BDO*).
e. Scanner Motor Control Mechanism
The scanner motor control mechanism is used to control the drive of the scanner motor
so that the horizontal resolution of print images will be 600 dpi. Also, the BD input signal
(*BDI) from the laser scanner unit is detected to monitor the rotation of the scanner mo-
tor.
f. Toner Level Detection Mechanism
The level of toner inside the developing assembly is monitored in relation to the toner
level detection signal (TNRCHKT), which is the result of comparison between the car-
tridge antenna output and the developing bias when the developing AC bias is applied for
normal rotation during the warm-up time.