Reader Unit Controls; Scanner Drive Control; Magnification Ratio; Original Detection - Canon imageRUNNER ADVANCE C350 series Service Manual

2
Technical Explanation > Original Exposure and Feed System > Reader Unit controls > Original Detection

Reader Unit controls

■ Scanner Drive Control

● Configuration of Drive System
The following shows the configuration of parts related to the scanner drive system.
Contact Image Sensor (CIS)
Drive Pulley
Reader Motor (M01)
CIS HP Sensor (PS01)
Item Notation
Reader motor M01 Pulse Motor: controls the carriage drive.
Drive Pulley, Drive Belt - Controls the carriage drive.
CIS HP sensor PS01 Photo interrupter: detects the home position of CIS unit.
Contact image sensor CIS Reads the original.
(LED + Light guide + Original reading sensor array unit)
2 Technical Explanation > Original Exposure and Feed System > Reader Unit controls > Original Detection
Drive Pulley
Drive Belt
F-2-16
Specification/function
T-2-6
● Reader Motor Control
The rotation/stopping and rotation direction/speed of Reader Motor (M01) are controlled
based on signals from the ASIC.
Main Controller PCB
+24V
BOOK_IB1
BOOK_IB0
BOOK_PHB
BOOK_PHA
ASIC IC8005
BOOK_IA1
BOOK_IA0
BOOK_VREF1
BOOK_VREF2
NOTE:
300dpi × 600dpi: 150.1 mm/sec (iR-ADV C250)
10.2 mm/sec (iR-ADV C351/C350)
600dpi × 600dpi: 93.3 mm/sec (iR-ADV C250)
35.8 mm/sec (iR-ADV C351/C350)

■ Magnification Ratio

● For BOOK Mode/When Using ADF
This equipment does not vary the scanning speed according to copy magnification ratio.
For an image scanned at the 300 dpi (horizontal scanning) x 600 dpi (vertical scanning)
or 600 dpi (horizontal scanning) x 600 dpi (vertical scanning) resolution instructed by the
controller, data processing is performed in the Main Controller PCB according to the copy
ratio.

■ Original Detection

Original detection and original size detection are not performed in the Reader Assembly.
2-13
J8103
1
2
J901
3
BOOK_OUTB BOOK_OUTB
4 4
BOOK_/OUTB BOOK_/OUTB
5 3
M01
BOOK_/OUTA BOOK_/OUTA
6 2
BOOK_OUTA BOOK_OUTA
7 1
F-2-17
2-13