Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 3 Troubleshooting
71
3.2 Unit Level Troubleshooting
When a problem occurs,
y
ou can identif
y
its cause b
y
the s
y
mptoms the
printer exhibits. The table below lists the s
y
mptoms of certain problems.
Once the problem is identified, refer to the flowchart that corresponds to
the problem.
3.2.1 Printer Does Not Turn On
Flowchart 1
Table 3-4. Flowchart Selection
Symptom Problem Flowchart No.
Printer does not turn
on
LEDs do not light.
Printer mechanism does not operate.
Flowchart 1
Error indicated by
LEDs
See Table 3-3 to determine the specific
error.
Flowchart 2
Printing failure Printing is not performed.
Abnormal printing (missing dots, etc.)
Print quality is poor.
Flowchart 3
Paper not feeding
correctly
Paper does not load.
Paper feeding is irregular.
Paper jam occurs.
Flowchart 4
Abnormal control
panel operation
Printer does not respond when buttons are
pressed.
Flowchart 5
START
Is the AC power line
voltage correct?
Has fuse F1 on the
power supply board
blown out?
Disconnect CN10 from the
main board and check the
output voltage from CN2 on the
power supply board.
Is the output voltage
of the power supply
normal?
END
Use only correct
input voltage.
Replace the fuse.
Replace the power
supply board.
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
Does the fuse
blow again?
NO (fuse fatigue)
Replace the fuse and
disconnect CN10 from
the main board.
Does the fuse
blow again?
Check the resistance
of the PF and CR
motor coils. (See
Table 3-1.)
Are the motors
OK?
Replace any
defective motors.
Replace the
main board.
Reconnect CN10.
Replace the power
supply board.

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English