Epson 890N Service Manual - Page 64

Troubleshooting for Individual Units, Main Component Checking Point - fx 890 printer troubleshooting

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EPSON FX-890/2190 Revision B 3.3 Troubleshooting for Individual Units 3.3.1 Main Component Checking Point The following components can be checked with a simple measurement tool, such as a multi-meter, easily. † Motors Motor PF Motor (CN13) CR Motor (CN12) Table 3-15. Motor Coil Resistance Test Points Test Pin Number Test Method* Meter Reading 1 and 3, 2 and 4 Place one lead on pin 1 (pin2) and the other 16.0 Ω ± 10% lead on pin3 (pin 4) on each of the test pins (at 25 °C per to check the two motor phases. one phase) Common pin: 5 Test pins: 1, 2, 3 and 4 Place one lead on pin 5 and the other lead on 2.7 Ω±10% each of the 4 test pins to check the two motor (at 25°C per phase. one phase) Note "*": Set the meter to ohms. Then disconnect the Motor from the Main Board and check it with printer power off. † Printhead „ Test Method : For example, place one lead on pin C1 and the other lead on Test pin 1 to check #1 pin of the Printhead solenoid. Test pin numbers match the printhead solenoid (dot wire) numbers. NOTE: Set the meter to ohms. Then disconnect the Motor from the Main Board and check it with printer power off. „ Specifications : 8.19 ± 0.8 Ω (at 25°C) Common Line C1 C2 C3 C4 Table 3-16. F Corresponding Wires Common Line 1, 7, 13 C5 9 C6 10, 18 C7 6, 12 C8 R Corresponding Wires 2, 5, 11 3, 15 16, 17 4, 8, 14 Note : 1~18: Wire numbers (Refer to "Figure 2-3" in Chapter 2 for wire numbers.) C1~ C8: Common terminals T: Thermistor terminal N: Not used (The contact of the connector and FFC is positioned at the bottom side of the connector.) Figure 3-2. Printhead Connector Pin Assignment Troubleshooting Troubleshooting for Individual Units 64

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EPSON FX-890/2190
Revision B
Troubleshooting
Troubleshooting for Individual Units
64
3.3
Troubleshooting for Individual Units
3.3.1
Main Component Checking Point
The following components can be checked with a simple measurement tool, such as a
multi-meter, easily.
Motors
Note
“*”:
Set the meter to ohms. Then disconnect the Motor from the Main Board and check it
with printer power off.
Printhead
Test Method
:
For example, place one lead on pin C1 and the other lead on
Test pin 1 to check #1 pin of the Printhead solenoid. Test
pin numbers match the printhead solenoid (dot wire)
numbers.
NOTE:
Set the meter to ohms. Then disconnect the Motor from the Main Board
and check it with printer power off.
Specifications
: 8.19 ± 0.8
Ω
(at 25
°
C)
Note :
1~18:
Wire numbers (Refer to “Figure 2-3“ in Chapter 2 for wire numbers.)
C1~ C8:
Common terminals
T:
Thermistor terminal
N:
Not used
(The contact of the connector and FFC is positioned at the bottom side of the
connector.)
Figure 3-2.
Printhead Connector Pin Assignment
Table 3-15.
Motor Coil Resistance Test Points
Motor
Test Pin Number
Test Method*
Meter
Reading
PF Motor
(CN13)
1 and 3,
2 and 4
Place one lead on pin 1 (pin2) and the other
lead on pin3 (pin 4) on each of the test pins
to check the two motor phases.
16.0
Ω
± 10%
(at 25
°
C per
one phase)
CR Motor
(CN12)
Common pin: 5
Test pins: 1, 2, 3
and 4
Place one lead on pin 5 and the other lead on
each of the 4 test pins to check the two motor
phase.
2.7
Ω
±10%
(at 25
°
C per
one phase)
Table 3-16.
F
R
Common
Line
Corresponding Wires
Common
Line
Corresponding Wires
C1
1, 7, 13
C5
2, 5, 11
C2
9
C6
3, 15
C3
10, 18
C7
16, 17
C4
6, 12
C8
4, 8, 14