Epson Stylus Pro 7700 Service Manual page 164

Epson Stylus Pro 7700/7710/7700M/7710M/7900/7910/9700/9710/9900/9910/WT7900/WT7910/9890/9908/7890/7908
Symptom Occurrence condition
Scratches on the bottom edge Scratches occur on the bottom
of the print under the
following conditions.
• Printed with [ROLL
PAPER MARGIN] for
CPF set to the following:
• [Default]
• [TOP 35/BOTTOM
15 mm]
• [15 mm]
• [3 mm]
• Printed on the bottom
35 mm with high duty
• Cut set on [Auto cut]
Missing white spots Missing white error occurs to
the print.
Vertical bands When printing in thick color
with high duty in the Surface
Print mode, vertical bands
appear.
When both color print and
white ink print are solid prints,
vertical bands are visible when
seen from the white ink side.
TROUBLE SHOOTING
Cause
The CPF pops to the left side when cut automatically, and the area
around the bottom 25 mm touches the eject roller. (Scratches there
become more conspicuous when printing with high duty.)
Missing white appears if paper dust or the like attached on the cutter
blade is transferred to the print surface and repels ink, or the paper dust
with ink is detached after printing.
Vertical bands as ink drying variation appear because the temperature
of the CPF surface differs between the area touching the platen ribs and
the area not touching them.
In solid prints, vertical bands are caused by the carriage vibration and
become visible because the difference of spotted ink locations can be
recognizable as the variation of dot density.
Remedies for Print Quality Troubles
Remedy/Points to be checked
Set [ROLL PAPER MARGIN] to [TOP 35/BOTTOM
15 mm].
Clean the dust or paper dust attached on the cutter blade of
the cutter unit such as by blowing it off.
• Print in the Reverse Print mode.
• Lower the white ink duty on the RIP setup or on the
image data.
Vertical bands on the white ink are hard to see from the
colored print side (the side to be viewed from).
Revision I
164
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