Service manual

Principles of Operation
The stepper that controls the carriage can hold the carriage at any position and
freely switch its direction. An open loop system controls the carriage motor and
switches the phase according to the set speed.
The drive chopping current is switched at the carriage motor drive frequency.
Figure 2-38 shows the relationship between drive speeds and switching current
values.
Figure 2-38.
Chopping Current and Drive Speed
2-40
LQ-200/AP3ooo