Schematic Diagram Of The Duplex Operation; Duplex Power And Control; Duplex Drive Generation And Distribution - Lexmark W820 Service Manual

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Schematic Diagram of the Duplex Operation

The following illustration is a simplified schematic of the Duplex Unit components,
subsystems, and paper paths.

Duplex Power and Control

All active components within the Duplex Unit are electrically connected to the Duplex
PWB. The Base Engine Low Voltage Power Supply supplies +5VDC and +24VDC to the
I/O PWB, and the I/O PWB supplies +5VDC and +24VDC to the Duplex PWB. The MCU
PWB provides most of the Duplex Unit logic, while the Duplex PWB executes the MCU
commands.

Duplex Drive Generation and Distribution

The Duplex Unit has one +24VDC motor, the Duplex Motor, that supplies drive to the
entire Duplex Unit. A Gear Assembly and drive belts transfer motor drive to Duplex
components. An electrical Wait Clutch controls drive to the Transport Rolls and the
Duplex PWB controls the Duplex Motor and the Wait Clutch.
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General Information