Lexmark W820 Service Manual page 30

4025 Options
Step 2
The Inverter CCW Clutch switches on and rotates the Offset Roll backward, driving the
sheet of paper back into the Exit Unit. The Exit Gate Solenoid toggles the Exit Gate so the
paper path runs to the Exit Roll. The Exit Roll drives the sheet of paper into the Duplex
Unit. The Duplex Exit Solenoid toggles the Duplex Exit Gate so the paper path runs to the
Duplex Transport Roll. Two sets of Transport Rolls drive the paper down to the Wait Roll.
The paper stops momentarily at the Wait Roll. When it is time to send the sheet of paper
back into the printer for printing on the second side, the Wait Clutch switches on and the
Wait Roll drives the paper out of the Duplex Unit and into the printer Registration Roll.
The paper stops at the Registration Roll so the image on the Drum can align with the
leading edge of the paper. When registration is complete, the Registration Roll drives the
paper into the Drum and BTR where the second side is printed.
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Service Manual