Canon PC1000s Service Manual page 163

CHAPTER 4 OPERATION
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 ADF (copyboard cover) openlclose sensor and the contact sensor
home position sensor are sent out to the image processor PCB via the analog processor
PCB.
1.3.2.7 Laser DriverIBD PCB
The image signals (VDO. VDO*) from the image processor PCB is converted into data
used for laser adjustment (to cause the laser diode to emit a laser beam). Also, the generated
laser beam is detected, and the laser beam detection signal (BDI*) is sent to the DC control-
ler PCB.
1.3.2.8 Main MotorlScanner Motor Driver
The main motorlscanner motor is driven according to the drive signals from the DC con-
troller PCB.
1.3.2.9 Printer Controller PCB (if equipped with printer functions)
The communications with the PC are controlled. The image data from the PC is converted
into print data for the machine, and is sent to the image processor PCB.
Communication Control
Communications with the PC are controlled using a bi-directional parallel interface (IEEE
std 1284-1994) or USB (Ver. 1.1). The communication protocols used for bi-directional
communications include: Nibble, ECP, Rapid Port.
The communication with the image processor PCB by means of a video interface are also
controlled.
USB Serial Number Notice Function
The USB serial number is communicated to the PC.
Smoothing
The 300 x 300-dpi image data from the PC is converted into image data equivalent of
1200 x
600 dpi; or, 600 x 600-dpi image data is converted into data equivalent of 2400
x
600-dpi.
COPYRIGHT92002 CANON INC. CANON PClf33MrnageCLASS D600s REV.
1
AVG.2002