Dot Missing Detection; Automatic Uni-D Adjustment - Epson Stylus Pro 4400 Service Manual
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EPSON Stylus Pro 4400/4450/4800/4880/4880C
DOT MISSING DETECTION
A pattern for dot missing detection is printed and dot missing is detected by
scanning the pattern. The pattern is printed by all the nozzles, with 1 nozzle
printing 1 block, and a block for a abnormal nozzle will not print. If dot missing
is detected, the printer will execute cleaning automatically.
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O.K. Pattern
Figure 2-54. Dot Missing Detection Pattern
Operating Principles
28 dot / (28/360 inch)
N.G. Pattern
Printer Mechanism Components
AUTOMATIC UNI-D ADJUSTMENT
A pattern for adjustment is printed, the pattern is scanned and acceptable
values are calculated from the collected values, and then adjustment is
automatically executed.
The pattern first prints the matte black vertical line row (standard lines) and
then prints an overlapping vertical line row in a different color (adjustment lines)
that has been shifted by 1/1440 block unit in the main scan direction. If the
standard lines and adjustment lines overlap, the collected A/D value (light
quantity) becomes higher because the width detecting the paper is wide. The
location detected with the most raised A/D values is determined to be the
acceptable level of Uni-D alignment.
A/D
Value
Figure 2-55. Automatic Uni-D Adjustment
Revision C
Standard lines
Adjustment lines
(Matte Black)
Most A/D values are high
= Uni-D acceptable
Scan Position
148
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