Carriage Meter Excitation System - Epson LQ-1050 Technical Manual

REV.-A
2.3.7.3 Carriage Motor Excitation System
The carriage motor is controlled by the carriage motor constant current drive circuit. The phases of
the carriage motor are controlled by AO l-DO 1 of the E05A09BA (2A). Two drive systems, 2-2 phase
and 1-2 phase excitation, are used. Because the carriage motor has one driving transistor per winding
become active alternately in the 1-2 phase excitation system. One step in the 2-2 phase excitation
system is equivalent to two steps in the I-2 phase excitation system. Figure 2-52 shows the carriage
motor drive sequence.
" D
Step
Rotation
OFF
N
"
OFF
1 2 3
(a) 2 Phase Excitation
)
I
OFF
I
1 2 3
(b) 1-2 Phase Excitation
Fig. 2-52. Carriage Motor Drive Sequence
the 2-2 phase excitation system and one and two drivers
in
I
I
I
1
I I
415 6
( C a r r i a g e m o v e s left to right. )
1 I
4 5 6
(Carriage moves left to right. )
2-52
I
7 1
I
I
I
I
I
1
7