Original Size Detection In Platen Mode - Ricoh B089 Service Manual

SCANNING

2.2.3 ORIGINAL SIZE DETECTION IN PLATEN MODE

[D]
[A]
[B]
[C] B027D554.WMF
In the optics cavity for original size detection, there are four reflective sensors in
the 115V machines ([A] and [B]), and six reflective sensors in the 230V machines.
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.
B089/B093 2-4 SM