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2.3.4 Initial Document Size Detection
The document length sensor 1 (PI4) and document length detection sensor 2 (PI5) detect the longitudinal size of the document placed on the document tray, and
the document width sensor 1 (PI2) and document width sensor 2 (PI1) detect the lateral size of the document.
When an document is placed on the document tray, detection levers of the two document length sensors move the light shielding plate to allow light pass through
the photo interrupter.
If the slide guide is adjusted to the document size, the two document width sensors mounted inside the document tray are shielded by the light shielding plate mount-
ed at the bottom of the slide guide.
Document sizes are determined by the combination of the ON/OFF states of document length sensors and the combination of ON/OFF states of document width
sensors.
The following tables show the relationships among document width sensors, document length sensors, and document sizes.
1. AB type
2. Inch type
Document
PI11
PI2
Document width
sensor 1
A3
ON
B4
OFF
A4R
OFF
B5R
ON
Size
A4
ON
A5R
ON
B5
OFF
A5
OFF
B6
ON
ADF driver PCB
Detection
lever
PI3
F-2-7
PI5
PI4
PI1
F-2-8
T-2-5
Sensor name
Document width
Document length
sensor 2
sensor 1
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Document length
sensor 2
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Chapter 2
0010-3901
2-5
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