Epson Stylus Color 660 Service Manual page 135

EPSON Stylus Color 440/640/740
Symptom Condition
Abnormal printing Only a particular dot
causes abnormal
printing.
A dot is not printed
occasionally.
Black specks or dots.
A vertical line is not
aligned.
White line appears in
the image data.
Chapter 3 Troubleshooting
Table 3-7. Repair of the Printer Mechanism
Cause Check Point
Print head surface is not Perform the cleaning operation several
clean. times and check printing.
(dot missing)
The head unit is defective. Perform the cleaning operation several
times and check printing.
Capping absorber is Check the head absorber visually.
touching the head surface.
Print head surface is not Perform the cleaning operation several
clean. (dot-missing) times and check printing.
The head FFC is Check the FFC by using a tester.
disconnected inside.
The head FFC is out of Check if the head FFC on the board or
connection. carriage is connected surely.
The head unit is detective. Perform the cleaning operation several
times and check printing.
I/C is defective. Install the new I/C and perform self-test.
The head FFC is out of Check if the head FFC on the board or
connection. carriage is connected surely.
The head unit is detective. Check connection with the head FFC.
Bi-directional alignment is Perform Bi-D adjustment.
not adjusted.
Head angle is not correct. Perform head angle adjustment.
Platen gap is not correct. Perform platen gap adjustment.
Dot shooting direction is Perform the cleaning operation several
tilted because head times and check printing.
surface is not clean
I/C is defective. Install a new I/C and perform the self-test.
Head unit is defective. Perform the cleaning operation several
times and check printing.
Revision A
Solution
Perform the cleaning.
If condition does not improve even
after the cleaning, replace the head.
Replace the head absorber if it is
deformed.
Perform the cleaning.
Replace the head FFC.
Connect the FFC properly.
If condition does not improve even
after the cleaning, replace the head.
Replace I/C.
Connect the FFC properly.
Replace the head if there is no
connection problem with the FFC.
Refer to Chapter4.
Refer to Chapter4.
Refer to Chapter4.
Perform the cleaning operation.
Replace I/C.
Replace the head unit.
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