Epson Stylus Pro 7700 Service Manual page 160

Epson Stylus Pro 7700/7710/7700M/7710M/7900/7910/9700/9710/9900/9910/WT7900/WT7910/9890/9908/7890/7908
Symptom Occurrence condition
Low print quality or stains Before or after printing, when
the adhesive material of the
Release Film touches the
coated side of the CPF and
causes uneven color or
scratches
Release Film
Crack • In the Surface Print mode,
cracks are caused in the
area, where color ink is
printed on the white ink.
• When printing with high
duty in the Surface Print
mode, cracks are caused on
the Print Surface. (Even
when printing in the
Reverse Print mode, cracks
may be caused when
printing with unexpectedly
high duty or in a usage
environment out of the
specifications.)
TROUBLE SHOOTING
Cause
The CPF is made of clear film on which a Release Film is attached with
adhesive. The adhesive is kept on the Release Film side, but if it
touches the print surface of the CPF, the print quality is lowered
because the ink absorption characteristics changes.
• Immediately after printing, ink is attached on the coat layer of the
CPF. The coat layer absorbs ink water, and swells. Cracks of
pigment on the surface of the coat layer are caused by this swelling.
• Conditions where this symptom easily occurs
1.Surface Print (Color ink is printed on the white ink.)
2.Printing in the 720 x 1440 dpi mode
3.Printing with high duty
4.High-humidity environment
Color Ink
White Ink
Coat layer
magnification
Remedies for Print Quality Troubles
Remedy/Points to be checked
Be careful to not let the adhesive side of the Release Film
touch the print surface.
• Use the printer under the following environment:
Temperature: 20 to 25 °C
Humidity: 40 to 60%RH
• Print in the 1440 x 1440 dpi mode.
(Crack occurrence decreases because the amount of ink
droplets in a path becomes smaller when the number of
scannings increases.)
• Lower the white ink duty on the RIP setup or on the
image data.
Crack
Revision I
160
Confidential