If the paper fails to reach the PS1 and PS2 sensors in the VTU within the allotted time, the Controller PCA on the 2 x 500-sheet Input Tray assumes that a paper jam has occurred. The 2 x 500-sheet Input Tray stops the operation and reports the paper jam to the Paper Handling Controller on the printer. A paper jam message appears on the printer control panel display. Hardware malfunctions are also displayed on the printer control panel. Lifter Operation The 2 x 500-sheet Input Tray drive motor lifts the paper when a tray is installed and when the pickup roller is lowered as a result of a partially filled tray. When a tray is installed, the Paper Pickup Solenoid SL3 is turned on.
The movements of the shaft drive arm and the lift-up release arm free the lift-up cam. This advances the lifter gear one tooth at a time, raising the lifting plate. When the paper on the lifting plate engages the pickup roller, the lift-up cam is stopped from rotating, and the lifting operation is completed. When the paper falls below a set level, the actions are the same to lift the plate, except the position of the pickup roller (which is lowered as paper is used) triggers the lift-up release arm to free the lift-up cam, advancing the lifter gear. The lifting operation terminates the same way in both cases, triggered by contact between the paper in the tray and the pickup roller.
Power Supply The 2 x 500-sheet Input Tray has an internal power supply activated when the printer power switch has been turned on. The Paper Handling Controller sends a power-on signal to the power supply through the 2 x 500-sheet Input Tray controller. When the signal is high, the power supply provides +24V and +5V to the paper deck driver. The +24V is used to drive the lifter, Feed, Pickup motors, clutches, and solenoids; +5V drives sensors and PCA electronics. C4085-91087 Paper Paths and Components 125