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Epson LX-300 Service Manual

Epson LX-300
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CHAPTER 2 Operating Principles
Table of Contents
2.1 PRINTER MECHANISM OPERATION
2-1
2.1.1 Printing Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.2 Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.3 Paper Handling Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.3.1 Paper Feed Mechanisms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.3.2 Paper Advance Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.4 Ribbon Advance Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.1.5 Ribbon Shift Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.1.6 Platen GapAdjustment Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2 POWER SUPPLY OPERATION
2-1o
2.2.1 Power SupplyOvefview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.2 Power Supply Circuit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3 CONTROL CIRCUIT
2-12
2.3.1 Control Circuit Operation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.3.2 Power On Reset Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.3.3 Home Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.3.4 Paper End Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.3.5 Release Lever Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.3.6 Carriage
MotorDriveCircuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.3.7 Paper Feed
MotorDriveCircuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.3.8
Printhead Drive Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.3.9 Interface Circuit.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.3.10
EEPROM Control Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
2.3.11
CSMotorAssembly
Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
2.3.12 Color Ribbon SensorCircuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

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Epson LX-300 Specifications

General IconGeneral
Print Method9-pin impact dot matrix
InterfaceParallel
Paper HandlingFriction feed, tractor feed
Weight4.4 kg
Operating EnvironmentTemperature: 5 - 35°C, Humidity: 10 - 80%

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