Original Size Detection: Platen Mode - Ricoh R-C4 Service Manual

21 July 2006 SCANNING

6.4.3 ORIGINAL SIZE DETECTION: PLATEN MODE

[D]
[A]
[B]
B205D554.WMFF
[C]
In the optics cavity for original size detection, there are five reflective sensors in
three APS units [A], [B], and [C]. The original width sensors [A] detect the original
width, and the original length sensors [B] and [C] detect the original length. These
are the APS (Auto Paper Select) sensors. Each APS sensor is a reflective
photosensor.
While the main switch is on, these sensors are active and the original size data is
always sent to the CPU. However, the CPU checks the data only when the platen
cover sensor [D] is activated. This is when the platen is positioned about 15 cm
above the exposure glass, for example while it is being closed. The CPU can
recognize the original size from the combination of on/off signals from the APS
sensors.
If the copy is made with the platen fully open, the CPU decides the original size
from the sensor outputs when the Start key is pressed.
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