Paper Feed Motor Drive Circuit - Epson LX-1050+ Service Manual

Operating Principles

2.3.2.4 Paper Feed Motor Drive Circuit

paper-feed motor drive circuit is shown in following figure. me paper-feed motor is a step
The
motor which can utilize 2-2 phase excitation. When the paper-feed signal PC2 is set to HIGH, Q20
and Q16 are turned on, and +24 V is supplied to the motor. When the paper-feed motor is not
driven, +5 V is supplied, via resistor R42 and diode D6, to hold the motor.
The paper feed motor is a 48-pole step motor and is open-loop controlled. When 2-2 phase
excitation is used to drive the motor, each step feeds the paper a distance of l/216th inch.
CPU
( 2 C )
19
I
RI 16
33K
(3 B)
8
9
10
11
Figure 2-16. Paper Feed Motor Drive Circuit
v VAV
LX-1050+ Service Manual
R36
A
,
GP
A
12
PF A
8
PF B
11
PF C
7
PF D