Unit Level Troubleshooting; Printer Does Not Operate At Power On - Epson Stylus Color 660 Service Manual

EPSON Stylus Color 440/640/740

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.
Table 3-4. Symptom and Problem
Symptom
Printer does not LEDs do not light.
operate at power on.
Printer mechanism does not operate.
Error is detected Error is indicated by LED indication.
Failure occurs Printing is not performed.
during printing.
Abnormal printing (missing dot, etc.)
Print quality is poor.
Printer does not No paper is fed.
feed paper correctly.
Paper feed is irregular.
Paper jam occurs.
Control panel No response to button access.
operation is
abnormal.
Chapter 3 Troubleshooting
Problem Flowchart No.
Flowchart 1
Flowchart 2
Flowchart 3
Flowchart 4
Flowchart 5

3.2.1 Printer does not operate at power on.

START
Is AC
power voltage
normal?
NO
YES
Is the
fuse(F1) of
power supply
board
YES
opened?
NO
Check output voltage
of CN2 in the power
supply board.
Is the
NO
output voltage
of power supply
normal?
YES
Exchange the main
board.
Check the motor and
head. Refer to the
repair item of the
printer mechanism.
Flowchart 1
Revision A
Input normal
power supply.
Exchange the fuse.
Disconnect CN10 in
the main board and
turn the power on
again.
NO Is the
fuse opend
again?
YES
Exchange the power
supply board
END
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