Epson STYLUS PRO 4910 - Page 289

Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
ADJUSTMENT Overview 290
Confidential
1 CR Related
3
PG Height Check &
Adjustment
Check if the platen gaps (distance between the Carriage
Unit and the platen) are within the standard value on the
right and left side of the Carriage Unit using the thickness
gauge. Check the two points on the platen; Home side and
Full side. If they are not within the standard value, adjust
the height.
 When the PG heights on the right and left of
the Head are out of the standard value, the
following symptoms may occur.
 Gap is too wide:
Unstable ink droplet paths or misaligned
dots occur, and it causes low printing
quality such as banding, printing
misalignment, or grainy image.
 Gap is too narrow:
The head rubs paper.
 Height gap between the right and left is
wide:
The nozzle side tilts and the printing
misalignment occurs on Bi-D Printing.
 When the PG height gap between Home side
and Full side is out of the standard, the same
symptom mentioned above may occur.
However, it may also be because of the
adjustment failure of the platen height or the
abnormality of the CR shaft. If so, it is
unavailable to react on the service site.
--- --- √ p.321
4
APG Check
Rotate the APG motor using the Service Program, switch
the PG, and check that the set position of the PG returns to
the home position (“--” (PG0.8 mm)) correctly.
When the PG is not switched properly
responding to the print setting, low image
quality or CL operation abnormality may occur.
√ --- --- p.326
5
CR Encoder and Scale
Check
Confirm that the CR Scale does not have any abnormality
such as damage or dirt and the encoder can read properly
using the Service Program.
When the CR Scale is not read properly and the
CR does not operate, an error occurs.
√ --- --- p.327
6
CR Speed Initialize
Reset the carriage speed control value to the default using
the Service Program.
The speed of the CR is controlled automatically to keep the
printing stability when the variation of the CR speed gets
larger because of the dirt on the scale or time degradation.
When the carriage related part is replaced, be sure to reset
the speed control to the default value.
If the speed control is not reset to the default, the
speed setting (setting to reduce the speed) which
has been controlled based on the dirty part
before the replacement is applied to the new part
and the printing speed is kept being slow.
√ --- --- p.328
Class Adjustment Items General Overview Symptom
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