Mailbox Power And Control; Mailbox Drive Generation And Distribution; Mailbox Power; Mailbox Control - Lexmark W820 Service Manual

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Mailbox Power and Control

All active components within the Mailbox are electrically connected to the Mailbox
Control 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 Mailbox
Control PWB. The MCU PWB provides most of the Mailbox logic, while the Mailbox PWB
executes the MCU commands.

Mailbox Drive Generation and Distribution

The Mailbox has one +24VDC motor, the Mailbox Drive Motor, that supplies drive to the
entire Mailbox. A Gear Assembly and drive belt transfers motor drive to Mailbox
components.

Mailbox Power

The base engine Low Voltage Power Supply and I/O PWB provide the +5VDC and
+24VDC that the Mailbox requires to operate. The Mailbox Control PWB, located inside
the Mailbox, plugs into the I/O PWB. The Base Engine LVPS supplies +5VDC and
+24VDC to the I/O PWB. The I/O PWB then supplies +5VDC and +24VDC to the Mailbox
Control PWB. The +5VDC powers the Mailbox Control PWB and the Mailbox Sensors,
the +24VDC powers the Mailbox Motor and the Mailbox Solenoids.

Mailbox Control

Mailbox Control is a broad term used to describe the printer resources that monitor and
control the actions and operations of the printer and the Mailbox; from bin output to error
detection.
The center of Mailbox control is the Mailbox Control PWB. The MCU PWB provides the
logic and information processing necessary for the printer to function, and the Mailbox
Control PWB provides the logic and information processing necessary for the Mailbox to
function. Every electrical component within the Mailbox is connected to the Mailbox
Control PWB. Sensors in the Mailbox send paper travel status information to the Mailbox
Control PWB. The Mailbox Control PWB processes that information and shares it with the
MCU PWB. Acting on the results of the processing, the Mailbox Control PWB sends
commands to the various Mailbox components; switching on the motor or switching off a
bin solenoid.
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