Canon F1 Service Manual page 51

2
Technology > Controls > DADF > Original Size Detection
■ Original Size Detection
● Overview
The following shoes the detection list of original size.
Timing Direction Sensor
LTR-R/LGL
Feed identification sensor
(SR8)
Start of
AB/ Inch identification
pickup
sensor (SR7)
Width
Original width volume
(VR)
Post-separation
Feed sensor 3 (PCB2)
Lead sensor 1 (PCB4)
In feeding
Original size sensor 1
Width
to 4 (SR17 to 20)
Note:
• Normal/mix of same configuration/mix of different configuration mode:
measurement value is converted to standard size.
• Extra long mode / (non-plain detection):
Measurement value is used for original size as it is.
2 Technology > Controls > DADF > Original Size Detection
Mode
Mix of same Mix of different Extra
Normal
specification configuration long
Yes - -
Yes Yes -
Yes Yes Yes
Yes Yes Yes
- - Yes
● Detection at Start of Pickup
Detection in feed direction
The size of original is determined whether it is LTR-R or LGL by LTR-R/LGL identification
sensor (SR8).
Once an original is placed on the original pickup tray, the light-blocking plate operates in
keeping with the detection lever of LTR-R/LGL identification sensor (SR8) and blocks the light
of photo interrupter.
With reference to the signal (LGL_S) of the LTR-R/LGL identification sensor (SR8) and the
-
original width, the machine determines whether or not the paper on the original pickup tray is
LGL.
- The machine communicates the original size information with the connected devices as soon
as the start key is turned ON.
Yes
Yes
-
T-2-15
DADF driver PCB
LGL size original
SR8
Detecting lever
2-38
F-2-78
2-38