Epson LX-300 Service Manual

Operating Principles
LX-WI Service Mimual
2.1.2 Carriage Movement Mechanism
The carriage movement mechanism consists of the carriage assembly, CR motor assembly, timing
belt, driven pulley, HP sensor, etc.
The CR motor assembly drives
tie tifig belt. me carriage
assembly is comected to the timing belt, which is moved by the CR motor assembly. Figure 2-2
shows the carriage movement mechanism.
The printer detects the carriage home position with the HP sensor. This sensor is the basis for
determining the carriage home position.
The HP sensor informs the CPU of
the carnage home
position. The sensor is ON, when the carriage is pushed to the right or left. The striker on the
carriage actives the sensor to indicate the carriage home position, which toggles the sensor to OFF.
Table 2-1. CR Motor Assembly Specifications
Category
Requirement
Type
4-phase, 48-pole, PM-type stepping motor
Drive Voltage
31.5 -38.5 VDC
Coil Resistance
180 ohms * 7Y0 (per phase, at 25° C, 77° F)
Drive Pulse Frequency
Normal Mode Draft
1320 p~
Color Mode Draft
1980 PPS
Excitation Method
Constant-voltage 2-2 phase excitation
1-2 phase excitation
CARRIAGE ASSY.,
TIMING BELT
.,
Figure 2-2. Carriage Movement Mechanism
,CR
2-2
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%