Epson Stylus COLOR 440 Service Manual page 92

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