3.3.3 Excitation Sequence
Drive the motor with 1-2 phase excitation. One step of the motor drive signal feeds the paper 0.03125 mm.
One dot line is consisted of 4 steps. When the voltage signal shown in Figure 3-4 is input to the motor drive
circuit shown in Figure 3-3, the printer feeds the paper in the normal direction when the motor is excited in
order of step 1, step 2, step 3, step 4, step 5, step 6, step7, step 8, step 1, step 2, . . . . , as shown in Table
3-3.
START
STEP
1st
STEP
2nd
STEP
3rd
STEP
4th
STEP
5th
STEP
6th
STEP
7th
STEP
8th
STEP
PH1
H
L
PH2
H
L
PH3
H
L
PH4
H
L
1 dotline
*1: Set MCL to "High" while the motor is driven.
Figure 3-4 Input Voltage Waveforms for the Sample Drive Circuit
Table 3-3 Excitation Sequence
Input Signal
Output Signal
PH1 PH2 PH3 PH4 A /A B /B
Step1
H L L L H L
OFF
OFF
Step2
H L L H H L L H
Step3
L L L H
OFF
OFF
L H
Step4
L H L H L H L H
Step5
L H L L L H
OFF
OFF
Step6
L H H L L H H L
Step7
L L H L
OFF
OFF
H L
Step8
H L H L H L H L
3-6