Ricoh B246 SERIES, Manual, Page: 121 / 268

121
121
Original Size Detection
„
1 length sensor (USA: 2 length sensors)
„
3 width sensors
DF Position
Sensor
APS Start
Sensor
Service manual, section 6.5.3
ˆ
Describe the sensors.
¾
The diagram in the service manual gives exact measurements of where these
sensors are.
ˆ
Make sure that the class is familiar with the table of sensor output vs original size.
ˆ
Make sure that the class understands what happens when all sensors are off (such
as when A5 sideways is set - too small for the sensors to detect).
¾
Use SP 4-303 this to select the machine’s behaviour if the sensors cannot
detect the size.
ˆ
The service manual explains how the width and length sensors work in the
following modes:
¾
Book (ADF open): The CPU checks the sensors when the Start key is
pressed.
¾
ADF: The CPU checks the sensors when the cover is lowered (detected by
the APS start sensor)
The other sensor near the APS start sensor detects when the ADF is open
or closed (DF position sensor).
¾
If paper is fed from the bypass tray: The sensors are ignored. The area that is
scanned depends on width detected at the bypass tray and the length
detected at the registration sensor. However, for the first sheet of copy paper,
this is unknown, so the entire exposure glass is scanned. This means that the
first copy will be slower.