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FUNCTIONAL PARTS
Motors
The forms feed motor
II
and the carrier motor Dare
sealed DC stepper motors consisting of a permanent
magnet rotor and 2 pairs of bifilar stator windings.
CAUTION
Stepper motors require no maintenance; they should not
be opened or disassembled because the magnetic flux
of the rotor will be reduced, which reduces the torque.
Each stepper motor is controlled by 4 DC control lines.
The direction the motor turns is determined by the
sequence of the control pulses; each time the phases
are shifted, the motor shaft rotates 2 degrees.
The timing chart shows the sequence of pulses to step
the motor counterclockwise. The combination of the
, -not A'. line and' -not B' line at the end of the
sequence holds the motor detented during settle time in
the example below. Note that the motor can be
detented in anyone of its motor ·steps.
(Underside View of the Printer
in the Service Position)
Pulse Sequence for 2°
Counterclockwise Increments
-----------------~'-----------------
B r
I
8.
)
I
I
(
Theory,
Features
Theory
5256 MIM
4-23
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