Epson Stylus Pro 4800 Portrait Edition, Service Manual

Page: 78 / 506

EPSON Stylus Pro 4400/4450/4800/4880/4880C Revision C
Product Description Operating Panel 78
†
Paper Thickness Detection Pattern
„
Print Specification
„
Relations between numbers in print pattern and paper thickness
Figure 1-22. Paper Thickness Detection Pattern
„
Displacement of lower pattern
If the displacement in the gap adjustment value with a change of
0.1mm in paper thickness is assumed to be xx microns, the following
applies.
Figure 1-23. Displacement of Paper Thickness Detection Pattern
Note: AB : Gap adjustment value with paper thi0.1mm
AC: Current gap adjustment value
AD: Gap adjustment value with paper thickness -0.1mm
A fixed displacement is assumed with changes in paper thickness.
X = AC – AB = AD – AC
X reference value is 14.40 µm with 240CPS, VSD2.
This adjustment value is saved into NVRAM and can be changed.
Example: If paper thickness is 0.2mm for gap adjustment.
Head speed 240 cps
Pattern height 64 dots
Dot size VSD2 Large
Color Black
Print direction Uni-D
Pattern interval Upper patterns: Equal intervals
Lower patterns: Centered on base position for gap
adjustment value, and displaced by an
equal distance left and right. Details are
described in next clause.
Others When printing starts from the edge of a media, media is
forwarded 90 mm for roll paper and 50 mm for sheets
before printing.
Numbers in print pattern 1 2 3 ... ... 15
Paper thickness (mm) 0.1 0.2 0.3 ... ... 1.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
10mm
9.0mm (64dot)
feeding
13.5m
m(9
6
dot
)
A4 width
13.5m
m(9
6
dot
)
Pattern
number
Displacement of bottom
pattern relative to top pattern
Pattern
number
Displacement of bottom
pattern relative to top pattern
1 +2X 9 –6X
2 +1X 10 –7X
3
±
0 11 –8X
4 –1X 12 –9X
5 –2X 13 –10X
6 –3X 14 –11X
7 –4X 15 –12X
8 –5X
Head
A B C D
If paper thickness is +0.1mm for
gap adjustment.
Paper thickness for gap
adjustment.
If paper thickness is -0.1mm for
gap adjustment.