Troubleshooting

Chapter 3

Troubleshooting

Test Points ................................................................................................

Error Codes ...............................................................................................

Problem Isolation .....................................................................................

Serial Communications Errors ........................................................

Connector Locations ...............................................................................

Sensor Locations .....................................................................................

Hex Quick Reference Table for ESC/P Commands ...............................

Hex Quick Reference Table for IBM Commands ...................................

List of Figures

Figure 3-1. Printhead Resistance ..........................................................

3-3

Figure 3-2.

Connector Locations ..........................................................

3-18

Figure 3-3.

Release Sensor ...................................................................

3-19

Figure 3-4.

Home Position Sensor .......................................................

3-19

Figure 3-5.

Platen Gap Sensor .............................................................

3-20

Figure 3-6.

Front and Rear PE Sensors ..............................................

3-20

List of Tables

Table 3-1.

Power Supply Test Points ...................................................

3-1

Table 3-2.

Sensor Test Points ...............................................................

3-2

Table 3-3.

Motor Test Points and Coil Resistance ...............................

3-2

Table 3-4.

Printhead Test Points and Coil Resistance .......................

.3-3

Table 3-5.

Printhead Driver Test Points ..............................................

3-4

Table 3-6.

Carriage and Paper Feed Motor Driver Test Points .........

.3-4

Table 3-7.

Error Codes ..........................................................................

3-5

Table 3-8.

Symptoms and Flowchart References .................................

3-6

Table 3-9.

Identifying Serial Communications Errors .......................

3-7

Table 3-10.

Hex Codes for ESC/P Commands .....................................

3-21

Table 3-11.

Hex Codes for IBM Commands .........................................

3-23

Epson FX-870/1170

3-i