72 EasyCoder PX4i and PX6i Service Manual
Chapter 8 — Print Unit
8.4 Belts
Description
The print unit has at least two timing belts, one that drives the platen
roller and another that drives the ribbon assist roller and the ribbon rewind
unit. There is also a third belt if an optional liner/batch takeup unit is
fi tted (see Chapter 9). The belts are subject to wear and may need periodi-
cal replacement. Properly adjusted tension and alignment of the pulleys
will increase time between replacements.
Replacement
• Switch off the power and disconnect the power cord.
• Open the front and right hand doors.
• Remove the cover over the electronics compartment, which is held by
eight #T10 Torx screws, see Chapter 3.3.
• Remove the tension of the belt to the ribbon rewind unit by loosening
the two #T20 screws that hold the unit, see Chapter 7.3.
• Dismantle the stepper motor from the bracket by removing the two
#T20 Torx screws.
• Free the belt from the pulley of the ribbon rewind unit and manipulate
the stepper motor so it comes free from both belts. Remove the stepper
motor.
• Replace the defective belt or belts.
• When putting back the stepper motor, fi t the short belt fi rst, while
letting the long belt hang loosely on the idler in a loop, through which
you can insert the pulley of the stepper motor. Do not put the long belt
around the pulley of the ribbon rewind unit until you have fi tted the
stepper motor to the bracket and checked that both belts are engaged by
the pulleys.
• Adjust the tension of the belts as described later in this chapter and put
back the cover.
Refer to illustration on the next page!
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General
Weight and Dimensions
