Epson LX-300 Service Manual

Chapter 5 Troubleshooting
Table of Contents
5.1 OVERVIEW
5-1
5.2 UNIT LEVEL TROUBLESHOOTING
5-4
5.3 REPAIRING THE MAIN BOARD ASSEMBLY
5-11
5.4 REPAIRING THE PRINTER MECHANISM
5-13
List of Figures
Figure 5-1. Troubleshooting Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Figure 5-2.
Printhead Connector Pin Alignment . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Figure 5-3. Flowchart Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
List of Tables
Table 5-1. Printhead Coil Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Table 5-2.
Printhead Driver Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Table 5-3. Motor Driver Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Table 5-4. Motor Coil Resistance Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Table 5-6. Sensor Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Table 5-6. Error State Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Table 5-7. Symptoms and Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Table 5-8. Repairing Problems in the Main Board Assembly. . . . . . . . . . . . . . 5-11
Table 5-9. Repairing the Printer Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

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%