Service manual

Motors
The LQ-200/AP3000 has the following motors:
l Carriage motor (stepper motor)
l
Paper feed motor (stepper motor)
Carriage motor
The carriage motor moves the carriage right and left along the platen. It is a four-
phase, 48-step motor that uses either 1-2 or 2-2 phase excitation. An open loop
system controls the carriage motor.
Paper feed motor
A four-phase, 48-step motor feeds paper. It advances the paper 1/180th of an inch
for each step (phase switch), using 2-2 phase excitation. The CPU controls the
paper feed motor under an open loop configuration.
Printhead
Figure 2-6 illustrates dot wire operation. The head driving coil energizes and this
drives the dot wire outward. The dot wire strikes the ribbon against the paper,
printing a dot.
Figure 2-6. Printhead
2-6
LQ-200/AP3000