Epson 2070 Service Manual - Page 123

OVERVIEW, 2 TROUBLESHOOTING INFORMATION, 1. Printhead Coil Resistance Test Points - lq troubleshooting

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LQ-2070 Service Manual Troubleshooting 5.1 OVERVIEW This chapter contains flowcharts and checkpoint tables to help you troubleshoot the printer. Flowcharts let you isolate a faulty unit based on abnormal symptoms. The checkpoint tables let you identify the faulty part or unit by checking the values or ranges listed for each component. 5.2 TROUBLESHOOTING INFORMATION This section gives troubleshooting information to let you check test points for replaceable units. 5.2.1 Printhead 5-1. Printhead Coil Resistance Test Points Common Pin No. Refer to the following figure. Test Pin No. Test Method (Set meter to ohms. Disconnect the printhead after the printer is powered off.) Meter Reading Refer to the Place one lead on each pin and the 39.3 ± 10% Ω following figure. other lead on each common pin. ( at 25° C, 77° F) R R F 3 1 1 2 19 7 C 3 C 6 C 2 2 2 1 5 1 8 23 1 0 1 4 6 F 5 1 13 9 21 17 C5 C4 C1 24 20 12 8 16 T T 4 R COM. C2 C3 C6 Pin No, 2,6,10,18 3,7,11,15 14,22,19,23 F COM. C1 C4 C5 Pin No, 1,8,16,24 4,12,20,21 5,9,13,17 T : Thermistor terminal C1~C6 : Common terminal 1~24 : Wire number Figure 5-1 Printhead Connected Pin Alignment Rev.A 5-1

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5.1 OVERVIEW
This chapter contains flowcharts and checkpoint tables to help you troubleshoot the printer. Flowcharts let
you isolate a faulty unit based on abnormal symptoms. The checkpoint tables let you identify the faulty part
or
unit by checking the values or ranges listed for each component.
5.2 TROUBLESHOOTING INFORMATION
This section gives troubleshooting information to let you check test points for replaceable units.
5.2.1 Printhead
5-1. Printhead Coil Resistance Test Points
Common
Pin No.
Test
Pin No.
Test Method
(Set meter to ohms. Disconnect
the printhead after the printer is
powered off.)
Meter Reading
Refer to the
following figure.
Refer to the
following figure.
Place one lead on each pin and the
other lead on each common pin.
39.3 ±
10%
Ω
( at 25° C, 77° F)
R
F
R
F
COM.
C1
C3
1,8,16,24
Pin No,
T
: Thermistor terminal
C1~C6
: Common terminal
1~24
: Wire number
3
11
C5
2
C6
7
22
15
14
18
6
10
5
1
13
17
9
C1
21
24
C2
16
C3
C4
20
8
12
T
T
4
19
23
2,6,10,18
C2
3,7,11,15
C4
4,12,20,21
C5
5,9,13,17
C6
14,22,19,23
F
COM.
Pin No,
R
Figure 5-1 Printhead Connected Pin Alignment
LQ-2070 Service Manual
Troubleshooting
Rev.A
5-1