Paper Size And Paper Tray Detection; Mechanism; Paper Size - Ricoh G157 Service Manual

PAPER TRAY UNIT

6.8.4 PAPER SIZE AND PAPER TRAY DETECTION

[C]
[B]
[A]
[I]
[H]

Mechanism

There is a circuit board [E] at the rear end of the left paper-tray rail. There are four
photosensors on this PCB. The three photosensors on the front side [A][B][C] 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 [H] that is mechanically attached to the front plate [F] can interrupt
the paper size sensors. This interrupter has an opening [I]. The interrupter can
interrupt two sensors or less.
The paper tray has one more interrupter [G] on its rear left corner. This interrupter
interrupts the paper tray sensor. If the paper tray is correctly set in the copier, the
paper tray sensor is always interrupted.

Paper Size

The table lists the sensor patterns and detected paper sizes.
Paper Size Sensor
[A]
Not interrupted
Interrupted
Not interrupted
Interrupted
Interrupted
Not interrupted
* Optional legal-size tray
G157
[G]
[B]
Not interrupted Not interrupted
Not interrupted Not interrupted
Interrupted Not interrupted
Not interrupted
Interrupted Not interrupted
Not interrupted
[D]
Paper Tray
[C]
Interrupted
Interrupted
Interrupted
Interrupted Interrupted
Interrupted
Interrupted Interrupted
6-38
[E]
[F]
G157D944.WMFF
Paper Size
Sensor
[D]
DL/#10
Executive
Letter
Legal*
B5
A4
SM