Epson FX-870

Troubleshooting
Chapter 3
Troubleshooting
Test Points ................................................................................................
3-1
Error Codes ...............................................................................................
3-5
Problem Isolation .....................................................................................
3-6
Serial Communications Errors
........................................................
3-7
Connector Locations
...............................................................................
3-18
Sensor Locations
.....................................................................................
3-19
Hex Quick Reference Table for ESC/P Commands
...............................
3-21
Hex Quick Reference Table for IBM Commands
...................................
3-23
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