Functions Of Stacker Tray Sensors/Motors - Oki B930 Service Manual

• A sheet of paper of less than 11 inches is stacked in
the Stacker Tray with the Staple Mode changed.
• An operator put a sheet (or sheets) when no paper is remaining in the Stacker Tray.
The size and condition of paper stacked in the tray are not identified.)
• Paper was present in the Stacker Tray when power was turned ON.
The size and condition of paper stacked in the tray are not identified.)
• The Finisher entered the Sleep Mode with "mix stacking" and then has exited the Sleep
Mode.
• The post-processing mode has changed.

Functions of Stacker Tray Sensors/Motors

1. Stacker Height Sensor 1
A pair of light emitter and photo-receiver to detect the height of paper in the Stacker Tray.
This sensor is used to control the Elevator Motor. When blocked by paper or the tray, this
sensor turns "H" deciding that the Stacker Tray is above the reference level. To the contrary,
when receiving light, this sensor turns "L" deciding that the Stacker Tray is below the refer-
ence level. The"H" to "L" turning point of the sensor is defined as the reference level.
2. Stacker Height Sensor 2
A pair of light emitter and photo-receiver to detect the height of paper in the Stacker Tray
(same function as Stacker Height Sensor 1). This sensor is also used to control the Elevator
Motor. When blocked by paper or the tray, this sensor turns "H" deciding that the Stacker
Tray is above the reference level. To the contrary, when receiving light, this sensor turns "L"
deciding that the Stacker Tray is below the reference level.
3. Stacker No Paper Sensor
A photo-interrupter to detect that the Stacker Tray is at the highest position, and also to
detect "no paper". When the Actuator attached to the Carriage Assy R enters the sensing
area, the emitted light is blocked, which turns the sensor to "H" (+5 V).
4. Upper Limit Sensor
A photo-interrupter to detect the Stacker Tray's abnormal elevation above the top position
(Stacker No Paper Sensor position). When the Actuator attached to the Carriage Assy R
enters the sensing area, the emitted light is blocked, which turns the sensor to "H" (+5 V).
5. Stack Encode Sensor
A photo-interrupter to count pulse of the Encoder attached to the Shaft-Elev. The paper vol-
ume in the Stacker Tray is detected based on this count.
6. Elevator Motor
A DC motor to elevate or lower the Stacker Tray. Clockwise rotation elevates the tray, and
counterclockwise rotation lowers the tray.
7. Eject Motor
A DC motor to eject stapled or non-stapled paper to the Stacker Tray. Clockwise rotation
ejects paper to the Stacker Tray, and counterclockwise rotation reverses the Eject Roll to
feed the paper from the Puncher to the Compile Tray.
8. Eject Clamp Motor
2-80
Top View of Finisher Tray
Rear
Staple
Front
Staple
FI6P021A1