Canon ImageRunner iR8500 Series, Service Manual, Page: 275 / 1122

Chapter 5
5-23
F-5-37
[3] An original is placed.
The width of the original is identified inrelation to the presence/absence of externallight; here, the absence of an original is identified at points in question,
eliminating B5, B4, A4, and A3.
F-5-38
[4] The Start key is pressed.
In response, original detection is started.
For main scanning direction, the xenon lamp is turned on to check for reflected light by the CCD (4 points). For sub scanning direction, the original sensor
starts detection. The absence of external light is identified as indicating the absence of an original. The machine will identify the size of an original based
on the combination of the results.
F-5-39
T-5-15
5.3.4.7 Book Mode, 1 Original, Copyboard Cover Close
0008-7415
/ iR8070
[1] The scanner remains in wait.
No. 1 mirror base: HP
Xenon lamp: off
Original sensor: disabled
AB-Configuration Inch-Configuration
Origi
nals
Point of CCD
detection
Original Originals Point of
CCD
detection Originals
size 1 2 3 4 sensor size 1 2 sensor
A3 yes yes yes yes yes 11"x 17" yes yes yes
B4 yes yes yes no yes LGL yes no yes
A4R yes yes no no yes LTRR yes no no
A4 yes yes yes yes no LTR yes yes no
B5 yes yes yes no no None no no no
B5R yes no no no yes
None no no no no no yes: reflection present no: reflection absent
(external light)
Original (A4R)
(external light)