Power Supply Components - Lexmark W820 Service Manual

Power Supply Components

The printer Power Supply is made up of five major components and a number of
subcomponents.
1.
Noise Filter PWB
Smooths and removes any fluctuation or hum from the AC line voltage.
Main Power Switch: Used to switch AC voltage on and off (switches the printer on
and off).
Ground Fault Interrupter (GFI): Used as a safety measure. If there is a short-
circuit, the GFI immediately cuts AC line voltage to the Noise Filter.
2.
AC Driver PWB
Receives smoothed AC voltage from the Noise Filter. The AC Driver PWB receives
Fuser temperature information from Fuser sensors and passes that information on to
the I/O PWB for processing. The MCU PWB signals the AC Driver to switch on or to
switch off AC voltage to the Fuser Heat Lamps.
4025-XXX
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General Information