Epson LQ-1060, Technical Manual

Page: 106 / 253

REV.-A
2.3.6.1 Reference Voltage Generation
Figure 2-56 shows the reference voltage generation circuit and Table 2-35 shows the relationship between
each terminal state of the gate array and CR motor coil current.
This circuit changes the voltage applied to ‘the RX terminal of the CR motor driver (1A) using
the combination of R5, R6, R7, and R8 so the current limiting value for the current flowing to a coil of
the CR motor varies.
The current limit is raised as the carriage speed increases by changing the voltage applied to the RX
terminal.
+ 5
S17300A
x
(1A)
GP
Figure 2-56. Reference Voltage Generation Circuit
Table 2-35. Relationship Terminal States and CR Motor Coil Current
RX Terminal Voltage
State
CR Motor Coil
Current [A/Coil]
High
H H H Driving
I
L H H
0.8
H L
H 0.6
Low
H H L Holding 0.15
2-59