Lexmark Pro5500 Series, Service Manual

Page: 169 / 277

Diagnostic aids
3-32
4447-20x
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Names and functions of components
Scanner unit assembly
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Scanner drive motor assembly
A DC motor that drives the scanner assembly.
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Sensor
A sensor that detects the base position of the scan bar.
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CIS scan bar
This is an imaging sensor that is composed of a number of sensors.
ADF unit assembly
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Paper load sensor arm
A sensor that detects the presence or absence of a document on the ADF document tray.
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Paper path sensor arm
The paper path sensor arm detects paper in the paper path in case of jams. It dictates the CIS scan
bar when to start scanning.
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ADF feed motor assembly
The feed motor assembly is a DC motor that rotates the pick roller and feed roller in the reverse
direction and rotates the ADF transport roll assembly in the forward direction.
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Idler
The idler will press the paper against the rollers to make sure that the paper moves when the roller
rotates.
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Exit roller
As the trailing edge of the paper leaves the feed roller, the exit roller controls the movement of the
paper until it can successfully exit.
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Feed roller
The feed roller controls the movement of the paper before it reaches the exit roller.
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Separation pad
The separation roller gets in contact with the separation pad, forming the separation nip that prevents
multiple feeds in case there are multiple picks.
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Separator roller
The separation roller gets in contact with the separation pad, forming the separation nip that prevents
multiple feeds in case there are multiple picks
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Pick roller
The pick roller picks the paper from the ADF input tray.
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Paper stopper
The paper stopper prevents over-insertion of the paper.
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Friction pad
The friction pad prevents multiple picks and wearing of the pick rollers.