Ricoh V-C3, Technical Training Manual

Page: 282 / 548

V-C3 Training
282
Slide 282
Original Size Detection
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3 length sensors
!
2 width sensors
DF Position
Sensor
APS Start
Sensor
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If the original is small (such as A5-LEF), all sensors are off and the machine
shows that the original size cannot be detected. However, you can force the
machine to detect A5/HLT in this situation if you adjust SP4303 (there are
settings for A5/HLT SEF and A5/HLT LEF).
#
When the power is on, the APS sensors are always active, but the CPU checks
their signals only after the platen is lowered.
$
The other sensor near the APS start sensor detects when the ADF is open
or closed (DF position sensor).
#
Book (ADF open): The CPU checks the sensors when the Start key is pressed.
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ADF: The CPU checks the sensors when the cover is lowered (detected by the
APS start sensor)
#
By-pass Mode: The APS sensors are ignored when copy paper is fed from the
by-pass tray, but the by-pass tray can handle a variety of sizes and orientations.
To accomplish this:
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The machine always assumes short-edge feed for paper on the by-pass
tray.
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Width is measured by a sensor inside the by-pass tray.
$
The bypass tray cannot measure length, so the registration sensor
determines length of the paper using clock pulses.