HP 8000dn Service Manual - Page 161
Printing from Tray 1, Printing from the Envelope Feeder
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Printing from Tray 1 The presence of paper in Tray 1 is detected by the Tray 1 Paper Present Sensor (PS1301). The lifting plate pressurization solenoid (SL2) is then activated, releasing the plate that applies upward pressure on the paper and causing it to contact the Tray 1 pickup roller. The Tray 1 Feed Clutch (CL3) turns on at this time and feeds the paper from Tray 1 to the registration position. The remainder of the Tray 1 print process is identical to the Tray 2 and 3 process, described in "Printing from Trays 2 and 3" on page 136. Printing from the Envelope Feeder The Envelope Feeder mounts in slots above Tray 1. The printer can print from Tray 1 when the Envelope Feeder is installed. When the print job calls for an envelope, it is fed directly to the Registration Assembly. From there, the print process is identical to the Tray 2 and 3 process, described in "Printing from Trays 2 and 3" on page 136. Printing from the 2000-sheet Input Tray (Tray 4) or 2 x 500-sheet Input Tray (Trays 4 and 5) Trays 4 and 5 feed the paper upward through a guide slot in the Lower Right Door Assembly to the Paper Input Unit. Once there, the operation is the same as printing from Trays 2 and 3, described in "Printing from Trays 2 and 3" on page 136. Two-Sided Printing The duplexer mounts inside the printer below the Fusing Assembly. The back side of the paper is printed first, the paper is turned over, and then fed back to the Registration Assembly for front side printing. When the print job calls for 2-sided printing, a solenoid in the duplexer operates the duplex flipper in the Diverter Assembly and routes the paper to the duplexer. The paper does not exit the printer when being turned over for 2-sided printing. It is routed through a slot in the back of the duplexer, down inside the left cover and under Tray 3. When the duplexer senses the trailing edge of the paper, it reverses direction and feeds the paper back through the duplexer to the Registration Assembly. EN Printer Input Sources 137