Intermec EasyCoder PX4i Service Manual page 71

EasyCoder PX4i and PX6i Service Manual
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The main parts of the print unit are:
• The rubber-coated platen roller drives the media forward under the
printhead and provides the necessary counter-pressure.
• The stepper motor drives the platen roller via one belt and the ribbon
assist roller and the ribbon rewind unit via another. The liner drive roller
is idle, unless a liner/batch takeup kit is fi tted, see Chapter 9.
• The tear bar makes it easier to tear off continuous and pre-perforated
media stock. It is also used for peel-off (self-strip) operation.
• The label stop sensor (LSS) controls the media feed and checks for out-
of-paper conditions.
• The printhead produces the heat that melts the "ink" on the transfer
ribbon or blackens the direct thermal paper in patterns that make up the
text, graphics, or bar codes.
• The headlift mechanism presses the printhead against the media or
transfer ribbon, or raises the printhead to allow media and ribbon load.
The print unit is a self-contained module and attached to the printer's
center section by means of four #T20 Torx screws. There are also a number
of cables running from the print mechanism to the driver and CPU boards
(see Chapters 14.1 and 15.3), which are not illustrated.
The ribbon rewind unit is driven by a belt from the motor of the print
unit via an idle pulley attached to the inside of the center section. The liner
drive roller (fi tted underneath the platen roller) is either idle or driven by a
belt to the optional liner/batch takeup stepper motor. These belts have to
be removed before the print unit can be pulled out.
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Chapter 8 — Print Unit
61