Tray Lifting - Oki B930 Service Manual

There are two Size Sensors: HCF Size Sensor R and HCF Size Sensor L.
By moving the GUIDE ASSY SIDE R to turn ON/OFF these sensors, and by using the resulting
sensor level patterns, paper size can be determined.

Tray Lifting

Tray lift operation starts automatically when the Tray is inserted with paper loaded.
The paper is lifted and stops at the feeding position. At the same time, detection of no paper and
remaining paper volume becomes available.
The Tray lifting operation when the power is turned ON or when the Tray is inserted is carried out
in the following procedure.
- Activate the Nudger Solenoid.
- Check the Level Sensor status a specified time has passed after the Nudger Solenoid is
activated.
- When the sensor is OFF, rotate reversely the Feed Motor to lift the Tray.
When the sensor is turned ON by the lift operation, stop the Feed Motor after a specified time
has passed to stop lifting the Tray.
If the sensor is ON at power ON, the Tray is regarded to be already at the feeding position.
Therefore, the Tray is no longer lifted.
While paper is being transferred to the IOT, the Tray lifting is carried out in the following proce-
dure.
- If Level Sensor OFF is detected when the Nudger Solenoid is deactivated during paper
feeding, quick lifting of the Tray is carried out.
In this case, rotate reversely the Feed Motor a specified time has passed after completion of
the paper transfer to the IOT, and then stop the motor after a specified time has passed. The
quick lifting is carried out while the motor is rotating reversely. The Nudger Solenoid is deac-
tivated during the quick lifting. At this time, the Nudger Roll is off the paper, and therefore no
paper is fed.
The tray lift operation is not carried out when a paper jam occurs in the HCF or when the Trans-
port Cover Interlock Switch or the Home Position Switch detects Interlock Open.
Lowering the Tray is carried out when the Tray is removed. No motor is used during the lowering
operation. The Tray descends only by the paper weight and the PLATE ASSY BOTTOM.
Feed Motor
PLATE ASSY BOTTOM
2-41
BRKT ASSY GEAR R PF2