Specifications
11-6. Original Size Detection Processing
The copier performs different processing for the detection of the original size
under different copier conditions as follows.
Copier Condition Original Size Detection Processing
1
The Original Cover is left
open.
LEDs of Original Size Detecting Sensors UN3 to UN7
project light onto the original and the photo receivers
of the sensors receive the reflected light and transmit
the corresponding data to Original Size Detecting
Board UN2.
UN2 determines the original size based on the
combination of the output data from the original size
detecting sensors.
UN2 divides the original size data into two parts and
transmits 4-bit parallel data to Master Board PWB-A
approx. every 73 msec.
PWB-A combines the 4-bit original size data back into
8-bit data and stores it in memory.
* Original Cover
Detecting Sensor PC4
remains deactivated.
2
The Original Cover is
lowered to an angle less
than 15°.
The original size data is latched when PC4 is
activated and the original size is set.
* PC4 is activated.
3
The Original Cover is
completely lowered.
The copier selects the appropriate paper size based
on the set original size data and selects the paper
source loaded with paper of that size, with the paper
size indicated on the control panel (when in the Auto
Paper or Size mode).
If the copier is unable to find the target paper size, it
gives a paper-empty warning message.
* The magnets fitted to
the Original Cover
actuate Size Reset
Switch S7.
4
The Original Cover is
raised to an angle less
than 15°
The set original size data and selected paper size are
reset.
* S7 is deactuated.
* PC4 remains activated.
5
The Original Cover is
raised to an angle more
than 15°.
The copier proceeds with the next original size
detection sequence.
* PC4 is deactivated.
Note: If the Start Key is pressed with the Original Cover raised (PC4 is
deactivated and S7 deactuated), UN2 transmits the original size
data available when the Start Key is pressed to Master Board
PWB-A for the selection of the paper size.
M-60