HP 8000dn Service Manual - Page 147
x 500-sheet Input Tray Operation, Pickup and Feed System, Power Supply, the control panel as well.
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UPC - 088698569634
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Page 147 highlights
2 x 500-sheet Input Tray Operation The 2 x 500-sheet Input Tray is an input paper handling device that provides two additional input trays that hold up to 500 sheets each. The device is designed to support different printer platforms with variable engine input speeds, from 6 to 32 pages per minute, and provide storage space for printer supplies or consumables. The device has automatic paper size sensing and enhanced network management capabilities. Communication and control of the input device are made through the Paper Handling Controller by a sequence of instructions controlled into the 2 x 500-sheet Input Tray controller PCA. Pickup and Feed System When the input device has been loaded and closed, the paper stack is lifted into position under the Pickup, Feed, and Separation rollers. The Pickup, Feed, and Separation rollers start rotating when the Paper Handling Controller sends a pickup command to the 2 x 500-sheet Input Tray. As the Pickup roller turns, the paper is fed into the vertical transfer unit and passes through the registration paper sensors. If the paper does not reach the sensors on time, the 2 x 500-sheet Input Tray controller assumes that a paper jam has occurred, stops the operation, and reports a delay jam to the Paper Handling Controller. A jam message will appear on the control panel display. If there is any hardware malfunction, it will be displayed on the control panel as well. The paper guides in Trays 4 and 5 operate four levers at the back of the trays that activate the paper size sensing switches (SW1601 to SW1604). 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. EN Paper Paths and Components 123
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