Epson LX-300 Service Manual

Operating Principles
LX-300 Service Manual
Table 2-2. PF Motor Assembly Specifications
Categov
Requirement
Type
4-phase, 48-pole, PM-type stepping motor
Drive Voltage
31.5 -38.5 VDC
Coil Resistance
56 ohms f 5Y0 (per phase, at 25°C, 77°F)
Drive Pulse Frequency
800,900,1000,1200,1300 pps
Excitation Method
Constant-voltage 1-2 phase excitation
Push Tractor Method
When the push tractor method is used with the rear entrance, the torque generated by the PF motor
assembly is transmitted to the push tractor gear through the PF motor assembly pinion gear, the
paper advance reduction gear, and the tractor transmission gear. When the PF motor assembly
pinion gear turns in the direction of the black arrows, the tractor gear rotates in the direction of the
black arrow and thus feeds the paper into the printer. The paper is advanced by the platen, which
is also driven by the PF motor assembly through the gear train.
(’*
.,-,
Continuous Paper
/
Push Tractor
~’v
. . . . . . . .-
I tb I UH
\
,,
,r~
PLATEN
COVER, ROLLER,
DRIVEN
PLATEN GEAR
Pinion Gear
MOTOR ASSY.,PF
Figure 2-4. Push Tractor Paper Advance Mechanism
r
“.
--
2-4
Rev.A

Epson LX-300 Specifications

General

Print Method	9-pin impact dot matrix
Interface	Parallel
Paper Handling	Friction feed, tractor feed
Weight	4.4 kg
Operating Environment	Temperature: 5 - 35°C, Humidity: 10 - 80%