image transfer and fusing processes. After the paper passes through the Fuser, it triggers PS1403 and PS1402 to the specified type, size, and destination of the paper being fed through the printer. Printing from the Envelope Feeder The Envelope Feeder mounts in slots above Tray 1. The printer can print from Tray 1 even during the installation of the Envelope Feeder. 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 115. Printing with the Duplexer 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. 116 Chapter 5 Functional Overview C4085-91087