Paper Size and Paper Tray Detection
G389 14 SM
2. DETAILS
2.1 PAPER SIZE AND PAPER TRAY DETECTION
There is a printed circuit board [B] at the rear end of the right paper-tray rail. There are four
photosensors on this PCB. The three photosensors on the front side [E] [F] [G] are the paper
size sensors. The other is the paper tray sensor [D]. The paper size sensors detect the
paper size in the paper tray. The paper tray sensor detects the paper tray.
The interrupter [I] that is mechanically attached to the front plate [A] can interrupt the paper
size sensors. This interrupter has an opening [H]. The interrupter can interrupt two sensors
or less.
The paper tray has one more interrupter [C] on its rear right corner. This interrupter
interrupts the paper tray sensor. While the paper tray is correctly set in the paper feed unit,
the paper tray sensor is always interrupted.
The table lists the sensor patterns and detected paper sizes.
Paper Size Sensor Paper Tray Sensor Paper Size
[G] [F] [E] [D]
Interrupted Not interrupted Not interrupted Interrupted B5
Not interrupted Not interrupted Interrupted Interrupted B5
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