47Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 8 Print Unit
8.4 Stepper Motor
The stepper motor drives the platen roller via a short belt and the
ribbon return roller and the ribbon rewind unit via another, longer
belt. A freely rotating pulley attached to the printer’s center section
makes the outside of the longer belt drive the ribbon assist roller.
All parts of the transfer ribbon mechanism and the liner drive roller
are omitted in EasyCoder 501 LinerLess, which also has a differ-
ent type of stepper motor bracket, see Chapter 8.2.
The stepper motor is fi tted by means of two #T20 Torx screws
to a bracket, which in its turn is attached to the print unit gable
by three #T20 Torx screws. When fi tting the stepper motor to the
bracket, check the tension of the belt to the platen roller before the
screws are tightened. The bracket does not need to be dismantled
for replacing the stepper motor or the belt.
The pulleys of the stepper motor are glued to the motor’s shaft.
The stepper motor is connected to P-401 on the CPU board.
#T20 Torx Screws
Stepper Motor
Bracket
(different type
in EasyCoder
501 LinerLess)
Belt
(to Platen Roller)
#T20 Torx Screws
Inner Print Unit Gable
Belt to Ribbon Rewinder
and Ribbon Assist Roller
(not EasyCoder 501 Liner-
Less)
Fitted to
center section
Fitted on
Ribbon Assist
Roller
Fitted on
Platen Roller
Shaft
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