Epson FX 890 Service Manual - Page 31

Overview - troubleshooting

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3.1 OVERVIEW FX-1180/FX-880 Service Manual Chapter 3 Troubleshooting The printer may exhibit different symptoms for the same problem, which makes troubleshooting more difficult. This section, however, provides simple and effective ways to facilitate troubleshooting. The following flowchart illustrates the main steps of the troubleshooting process. START Unit Level Troubleshooting Unit Repair of the C229PSB/PSE/PSH Board Unit Repair of the C229MAIN Board Unit Repair of M-3J10 Mechanism Assembly and Adjustment END Figure 3-1. Troubleshooting Process Flowchart 3.1.1 Main Component Checking Point The following components can be checked by a simple measurement equipment such as a multimeter, etc.) easily. Table 3-1. Motor Coil Resistance Test Points Motor Connector Number PF Motor (CN8) CR Motor (CN9) Test Pin Number 1 and3, 2 and 4 Common pin : 5 Test pins : 1, 2, 3 and 4 Test Method (Set Meter to Ohms. Disconnect Motor from Main Board and check it with Printer Power off.) 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. Place one lead on pin 5 and the other lead on each of the 4 test pins to check the two motor phase. Meter Reading 16.0 Ω ± 10% (at 25°C par one phase) 2.7 Ω ± 10% (at 25°C par one phase) Rev. B 3-1

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FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-1
3.1 OVERVIEW
The printer may exhibit different symptoms for the same problem, which makes troubleshooting
more difficult. This section, however, provides simple and effective ways to facilitate
troubleshooting. The following flowchart illustrates the main steps of the troubleshooting process.
START
Unit Level Troubleshooting
Unit Repair of the
C229PSB/PSE/PSH
Board
Unit Repair of the
C229MAIN Board
Unit Repair of
M-3J10 Mechanism
Assembly and Adjustment
END
Figure 3-1. Troubleshooting Process Flowchart
3.1.1 Main Component Checking Point
The following components can be checked by a simple measurement equipment such as a multi-
meter, etc.) easily.
Table 3-1. Motor Coil Resistance Test Points
Motor
Connector
Number
Test Pin
Number
Test Method
(Set Meter to Ohms. Disconnect
Motor from Main Board and check it
with Printer Power off.)
Meter Reading
PF Motor
(CN8)
1 and3, 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 par one
phase)
CR Motor
(CN9)
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 par one
phase)