Epson Stylus Pro 4910 Service Manual page 291

Epson Stylus Pro 4900/Epson Stylus Pro 4910
Class Adjustment Items
3
Cleaning
CR & PF Direction
4
Head Slant Adjustment
2 Head Related
5
Auto Bi-D Adjustment
Colorimetric
6
Calibration Adjustment
ADJUSTMENT
General Overview
Specify the power and the color from the Service Program
and execute the head cleaning.
Print the pattern on which the tilt of the Printhead in CR
and PF directions can be checked from the Service
Program, and check the misalignment level visually.
When the misalignment symptom is observed, turn the
adjustment dial (in CR direction) and the adjustment lever
(in PF direction) of the carriage to correct the tilt.
Reduces the difference of spotted ink locations on Bi-D
printing (bi-directional printing).
Adjust the amount of ink droplets responding to the
characteristics of the Printhead and the electrical
characteristics (dependent to the Main Board and the
Power Supply Board) which differ depending on the
printer. Use the dedicated software and the Color
Measurement Device for this adjustment.
Measure the print pattern with the Color Measurement
Device, create the correction value from the result, and
then write the value to the NVRAM. The printer reads the
correction value to correct the amount of ink droplets.
Overview
Symptom
When the cleaning is not executed, the following
symptoms may occur.
Nozzle clogging is not solved and the
printing cannot be executed properly.
Ink does not come out and the printing cannot
be executed after replacing to a new
Printhead. (Executing Initial Charge may
solve this problem but it takes time and
consumes lots of ink.)
If CR Direction Head Slant Adjustment is not
executed, the printing position is misaligned
on the whole rows of the Printhead, and it
may cause low printing quality such as
grainy image, banding, and unevenness.
If the PF Direction Head Slant Adjustment is
not executed, flow curve or difference of
spotted ink locations occurs since the
distances from paper differ between the front
side and the rear side of the Printhead. It may
cause low printing quality such as grainy
image, banding, and unevenness.
If Auto Bi-D Adjustment is not executed, the
difference of spotted ink locations may occur,
and it causes low printing quality such as
printing misalignment, grainy image, and
banding.
If Colorimetric Calibration Adjustment is not
executed, the ink droplets amount changes when
replacing the Printhead, Main Board, or Power
Supply Board, and it causes a variability of color
on the printed result depending on the printer.
Revision A
Tool
Page
SP SM MECH
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