Epson 440 - Manual (Page 85)

EPSON Stylus Color 440/640/740 Revision A
Chapter 3 Troubleshooting 85
3.2 Unit Level Troubleshooting
When a problem occurs, you can identify the defective unit according to
the symptoms exhibits. The table below lists the symptoms of certain
problems. Once the problem is identified, refer to the flowchart that
corresponds to the problem.
3.2.1 Printer does not operate at power on.
Flowchart 1
Table 3-4. Symptom and Problem
Symptom Problem Flowchart No.
Printer does not
operate at power on. LEDs do not light.
Printer mechanism does not operate.
Flowchart 1
Error is detected Error is indicated by LED indication. Flowchart 2
Failure occurs
during printing. Printing is not performed.
Abnormal printing (missing dot, etc.)
Print quality is poor.
Flowchart 3
Printer does not
feed paper correctly. No paper is fed.
Paper feed is irregular.
Paper jam occurs.
Flowchart 4
Control panel
operation is
abnormal. No response to button access. Flowchart 5
Is AC
power voltage
normal?
YES
Is the
fuse(F1) of
power supply
Is the
output voltage
of power supply
normal?
Exchange the main
board.
NO
Input normal
power supply.
NO
Exchange the fuse.
Disconnect CN10 in
the main board and
turn the power on
again.
YES
Check output voltage
of CN2 in the power
supply board.
Exchange the power
supply board
Check the motor and
head. Refer to the
repair item of the
printer mechanism.
START
END
YES
NO
board
opened?
YES
Is the
fuse opend
again?
NO