Unit Level Troubleshooting - Epson 440 Service Manual

5.2 Unit Level Troubleshooting

When a problem occurs, you can identify the defective unit according to the symptoms exhibited.
The table below lists the symptoms of certain problems. Once the problem is identified, refer to the
flowchart that corresponds to the problem.
Symptom
Printer does not operate at
power on
Error is detected
Failure occurs during printing
Printer does not feed the
paper
correctly
Control panel operation is
abnormal
Rev. A
Table 5-4. Symptom and Problem
Problem
•¡LEDs do not light up.
•¡Printer mechanism does not operate.
•¡Error is indicated by LED indication.
•¡Printing is not performed.
•¡Abnormal printing(missing dot, etc.)
•¡Print quality is poor
•¡No paper is fed.
•¡Paper feed is irregular.
•¡Paper jam occurs.
•¡No response to button access.
Chapter 5 Troubleshooting
Flowchart No.
Section 5.2.1
Section 5.2.2
Section 5.2.3
Section 5.2.4
Section 5.2.5
5-3