Overview; Troubleshooting Information; Print Head - Epson TM-FX2180 Service Manual

EPSON FX-2180 Service Manual

3.1 Overview

This chapter contains flowcharts and checkpoint tables for
troubleshooting the printer. The flowcharts tell you which printer unit or
part to replace based on the printer's symptoms. The checkpoint tables
list the correct values and ranges for printer part characteristics, such as
resistance and continuity. You can compare the characteristics of a printer
part to the checkpoint values to identify defective parts.

3.2 Troubleshooting Information

This section describes how to determine whether various printer units or
parts are defective.

3.2.1 Print Head

To determine whether a print head is defective, measure the print head's
coil resistance as described in the table below. Then compare the coil
resistances with the correct meter reading in the table.
Table 3-1. Print Head Coil Resistance Test Points
Common pin numbers
Test pin numbers
Test method
Meter reading
See Figure 3-1
See Figure 3-1
Turn off the printer and disconnect the
print head. Set the meter to ohms, and
place one lead on each pin and the other
lead on each common pin.
16.4 10% at 77 F (25 C)
3 X
R
F
X 1 9 13 7 C1
F
COM. C1 C2 C3 C4
Pin No.
1, 7, 13 9 10, 18 6, 12
T: Thermistor terminal
X: Not used
Figure 3-1. Print Head Connector Pin Alignment
Chapter 3 Troubleshooting
R
15 C5 2 C6 5 16 11 C7 17 C8 X 14 4 8
F
X 18 C2 12 C3 C4 X 6 10 T T X
R
COM. C5 C6 C7 C8
Pin No.
2, 5, 11 3, 15 16, 17 4, 8, 14
3-1