Paper Feed Motor Drive Circuit - Epson LQ-1050 Technical Manual

REV.-A

2.3.8.3 Paper Feed Motor Drive Circuit

Figure 2-66 shows an open-loop circuit for constant voltage drive and the 2-2 phase excitation system
driven by +35 V DC.
between the hold/run modes.
switches
P o T
(2A
5
c 02 '
Hold Mode
When is low, transistor
lines via R79 and D44, so that the motor is held. At this time, motor driving pulses
does not change.
Run Mode
When is high, transistor
common lines. At this time,
paper feed motor. At this time,
through of the
R
R
8
R 26
R25
Fig. 2-66. Paper Feed Motor Driving Circuit
and cut off and applies + 5V to the paper feed motor common
and turn on and applies
through
= C02 and B02 =
(2A) control the coil excitation system, and
+5
control driving transistors Q39 to
2-64
5
I
' o "
1 ,
2
c
through
DC to the paper feed motor
which drive the