Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 3 Troubleshooting
83
Abnormal printing A particular dot
consistently causes
abnormal printing.
Printhead surface is not
clean (dot missing).
Perform the cleaning operation several
times and check printing.
Perform the cleaning operation.
The printhead is defective. Perform the cleaning operation several
times and check printing.
If condition does not improve even
after the cleaning, replace the head.
The pad in the capping
mechanism is touching the
head surface.
Check to see if the pad is deformed or out of
position.
Replace or reposition the pad.
A particular dot
sometimes fails to print.
Print head surface is not
clean (dot missing).
Perform the cleaning operation several
times and print a self-test.
Perform the cleaning.
The head FFC is defective
(open circuit).
Check the FFC with a meter. Replace the head FFC.
The head FFC is loosely
connected.
Check if the FFC is securely connected to
the board and carriage.
Connect the FFC properly.
The printhead is defective. Perform the cleaning operation several
times and check the printing after each
cleaning.
If the condition does not improve
even after several cleaning
operations, replace the printhead.
The ink cartridge is
defective.
Install the new ink cartridge and perform
self-test.
Replace the ink cartridge.
Black specks or dots
appear.
The head FFC is loose. Check if the FFC is securely connected to
the board and carriage.
Connect the FFC properly.
The printhead is detective. Check connection with the head FFC. Replace the head if there is no
connection problem with the FFC.
A vertical line is not
aligned.
Bi-directional alignment is
out of adjustment.
Perform the Bi-D adjustment. Refer to “Bi-D Adjustment” in Section
5.2.2.10.
White lines appears on
the printed page.
Head angle is not correct. Perform the head angle adjustment. Refer to “
Head Angle Adjustment” in
Section 5.2.2.9.
Platen gap is not correct. Perform the platen gap (parallelism)
adjustment.
Refer to “
Parallelism Adjustment” in
Section 5.2.1.
Ink jet is deflected by
foreign substances on the
printhead.
Perform the cleaning operation several
times and check printing.
Perform the cleaning operation.
Ink cartridge is defective. Install a new ink cartridge and perform the
self-test.
Replace the ink cartridge.
Printhead is defective. Perform the cleaning operation several
times and check printing.
If printing fails to improve after
cleaning the printhead, replace the
printhead.
Table 3-7. Repair of the Printer Mechanism (continued)
Symptom Condition Cause Checkpoint Solution

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English