Service manual

Principles of Operation
Gate array E0lA05 in the carriage motor drive circuit
Gate array E0lA05 (6C) implements phase switching for the carriage motor, which
is a stepper motor. The gate array first sets the excitation type (2-2 or 1-2 phase)
and rotation direction (clockwise or counterclockwise). When the CPU outputs a
pulse to the gate array’s TM terminal, the gate array executes auto phase
switching, which drives the stepper motor. Figure 2-31 shows this process.
Figure 2-31. Gate Array Operation, 2-2 Phase Excitation
2-32
LQ-2OO/AP3000