CHAPTER 2. BASIC OPERATION
2–24
B. Carriage Motor Control
1. Outline
The carriage motor (M2) of this machine is a 2-phase stepping motor. It controls the back and
forth movement of the carriage. The carriage motor (M2) is controlled by the engine controller,
the main functions of which are shown below. Figure 2-202 is a block diagram of the carriage
motor control circuit.
[1] Carriage motor ON/OFF control
[2] Carriage motor direction control
[3] Carriage motor speed control
[4] Carriage motor supply current control
2. Operation
a. ON/OFF control
Carriage motor ON/OFF is controlled by the carriage motor driver control signal (MTP12-15)
issued by the CPU to the carriage motor driver on the engine controller.
When MTP12 - 15 are "0", the carriage motor driver generates motor drive pulses (YMA,
YMAN, YMB, YMBN) and the carriage motor (M2) is rotated by those pulses.
On the other hand, when MTP12-15 are "1", no motor drive pulses are generated and the
carriage motor (M2) stops rotating.
Figure 2-202
+26V
M2
Carriage
motor
Carriage
motor
driver
Current
control
circuit
Engine controller PCB
C P U
D/A 1
MTP 9
MTP 10
MTP 11
MTP 12
MTP 13
MTP 14
MTP 15
Vref 1
Vref 2
YMA
YMAN
YMB
YMBN
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