Analog Processor Pcb; Sensor Pcb; Laser Driver/Bd Pcb; Main Motor/Scanner Motor Driver - Canon SmartBase 1270D Service Manual

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) open/close 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 Driver/BD PCB

The image signals (VD0, VD0*) 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 Motor/Scanner Motor Driver

The main motor/scanner motor is driven according to the drive signals from the DC con-
troller PCB.

1.3.2.9 Printer Controller PCB

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.
COPYRIGHT © 2002 CANON INC. 2000 2000 2000 2000 CANON SmartBase PC1210D/1230D/1270D REV. 1 MAR. 2002
CHAPTER 4 OPERATION
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