Canon Duplex Color B1, Service Manual

Page: 31 / 97

5
5
5-12
5-12
ADF - Technology > Adjustment > Scanner Unit > Glass Shift Control
ADF - Technology > Adjustment > Scanner Unit > Glass Shift Control
2-Sided Scanning Control
Scanning of 2-sided original is performed by simultaneous 2-sided scanning method.
(reversing 2-sided scanning is not performed).
This is to feed the original in the machine only once by scanning the front side with the
scanner unit in the reader unit while scanning the back side with the scanner unit in the DADF
at the same time.
Scanner unit
(DADF)
Scanning position for the rear side
Scanning position for the front side
Scanner unit
(Reader)
Service Mode
(Lv.1) FEEDER > ADJUST > ADJMSCN1
Zoom adj in 2-sided main scan way: front
(Lv.1) FEEDER > ADJUST > ADJMSCN2
Zoom adj in 2-sided main scan way: back
(Lv.1) FEEDER > ADJUST > ADJSSCN1
Zoom adj in 2-sided sub scan way: front
(Lv.1) FEEDER > ADJUST > ADJSSCN2
Zoom adj in 2-sided sub scan way: back
■
Glass Shift Control
This equipment has a scanning glass on the undersurface of the scanner unit.
A standard white plate is attached to this scanning glass for shading correction and dust
detection correction.
The reader controller drives the glass shift motor (M9) on a timely basis to shift the scanning
glass.
This enables the reader controller executing above-mentioned correction by comparing
reflection data between the position of standard white plate and the position for image
scanning.
State Shift operation of scanning glass
Wait
Yes
Standby No
When recovered from sleep state
Yes
When scanning 2 sides
Yes
At post rotation
Yes (After 2 sides scanning only)
[1] Glass shift home position detection signal
[2] Glass shift motor drive signal
[3] Scanning glass
[4]
Standard white plate
[5] Scanner unit
SR11:
Glass shift home position sensor
M9:
Glass shift motor
Error code:
E202 (Error in scanner home position)
-0101 Error at the glass home position detection operation (outward)
-0102 Error at the glass home position detection operation (homeward)
■