Lexmark Pro5500 Series, Service Manual

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3-25
Service Manual
4447-20x
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Theory of operation
Engine
Function
In order for an image to be printed, the media has to be moved from an input source (such as a tray) into the
print zone and eventually exit into an output bin. The engine uses rollers to move and deskew the media, and
sensors for timing.
The most important component in this process is the media itself. Old, damaged, or out-of-specification media
can and will cause feed and transport problems. If you encounter problems, always check the media first. See
“Media guidelines” on page 1-27 . In addition, it is always good practice to check the printer and driver settings
to see if the media being used matches the user’s settings. It is not uncommon to find a user printing on card
stock with the printer programmed to print on a plain paper setting.
The printer’s feed and transport components can fail and cause paper jams or other feed and transport
problems. These components should be examined for damage or wear and replaced if necessary.
Paper path information
The printer has a C-shaped paper path (see the picture below). The paper paths are shown in red. Media is fed
from the front of the printer from the input tray, and travels upward along the rear side of the printer.
Note: There is a duplex unit (not shown) in this printer. The duplex unit is attached to the rear of the printer.
Duplexing is described later.