Unit Level Troubleshooting; Printer Does Not Turn On - Epson Stylus COLOR 440 Service Manual

EPSON Stylus COLOR 440, 640, and 740

3.2 Unit Level Troubleshooting

When a problem occurs, you can identify its cause by the symptoms the
printer 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. Flowchart Selection
Symptom
Printer does not turn LEDs do not light.
on
Printer mechanism does not operate.
Error indicated by See Table 3-3
LEDs error.
Printing failure Printing is not performed.
Abnormal printing (missing dots, etc.)
Print quality is poor.
Paper not feeding Paper does not load.
correctly
Paper feeding is irregular.
Paper jam occurs.
Abnormal control Printer does not respond when buttons are
panel operation pressed.
Problem Flowchart No.
Flowchart 1
to determine the specific Flowchart 2
Flowchart 3
Flowchart 4
Flowchart 5

3.2.1 Printer Does Not Turn On

START
NO
Is the AC power line Use only correct
input voltage.
voltage correct?
YES
YES
Has fuse F1 on the
Replace the fuse.
power supply board
blown out?
NO
Disconnect CN10 from the
Replace the fuse and
main board and check the
disconnect CN10 from
output voltage from CN2 on the
the main board.
power supply board.
Check the resistance
YES
Is the output voltage
of the PF and CR
of the power supply motor coils. (See
normal?
NO
NO
Replace the power
supply board.
Replace any
defective motors.
Flowchart 1
Chapter 3 Troubleshooting
NO (fuse fatigue)
Does the fuse
blow again?
YES
YES
Does the fuse Replace the power
blow again? supply board.
NO
Table 3-1.)
YES
Are the motors
OK?
Replace the
main board.
Reconnect CN10.
END
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