Epson TM-FX2180 manual Troubleshooting Information, Print Head

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.

3.2.1Print 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	See Figure 3-1
Test pin numbers	See Figure 3-1
Test method	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.
Meter reading	16.4 Ω ± 10% at 77° F (25° C)

Chapter 3 Troubleshooting

R

3

X

15 C5 2 C6

5

16 11

C7

17 C8 X 14 4

8

R

F

F

X 1

9

13 7 C1 X

18 C2 12

C3

C4 X 6 10 T

T X

F

R

COM.

C1

C2

C3

C4

COM.

C5

C6

C7

C8

Pin No.

1, 7, 13

9

10, 18

6, 12

Pin No.

2, 5, 11

3, 15

16, 17

4, 8, 14

T:Thermistor terminal

X:Not used

Figure 3-1. Print Head Connector Pin Alignment

3-1