Epson Stylus Pro 7400 Service Manual page 95

EPSON Stylus Pro 7400/7800/9400/9800
1.4.4.37 Head Alignment (Bi-D Adjustment, Uni-D Adjustment)
This function allows the user to make the Bi-D and Uni-D adjustments in accordance
with the thickness of paper to be used. The adjustments can be carried out
automatically by selecting the "Auto" in the "Alignment" menu. When the "Auto" is
selected, the printer prints an adjustment pattern, checks the pattern, and make the
adjustments according to the detected result automatically.
Procedure
1. Set the paper.
2. Select the "Head Alignment" menu from the panel.
3. Select the "Standard" in the "Paper Thickness" menu if the paper is EPSON
paper with thickness of 0.2 or 1.2 mm. If the paper does not fit the
requirements, the thickness can be entered in increments of 0.1 mm.
4. Select "Auto" or "Manual" in the "Alignment" menu.
5. Select the pattern from "Uni-D", Bi-D 2 Color", and "Bi-D All" and execute
it. "Printing" will be displayed on the LCD.
6. Check the printed adjustment pattern and enters the number of the line or
block with the least displacement for each color.
7. Repeat Step 5 to 6 until the all three adjustments are completed.
NOTE: For details on the adjustment patterns, see
adjustment patterns (p.
Product Description
"Head Alignment
98)".
Adjustment Method
The printer calculates the Uni-D and Bi-D correction values based on the "Head
Alignment" result, Platen Gap setting and the paper thickness.The correction
values are classified by five Platen Gap settings (0.8mm/1.2mm/1.5mm/2.1mm/
2.6mm) and stored on the NVRAM to create a table to be referred to from that
time. The setting table is rewritten each time the adjustments are made.
The table below shows how the printer stores the settings.
Table 1-48. Storing the Correction Values
Paper Paper
Thickness Thickness
Sensor Input
Less than Standard
0.8 mm
0.8 mm or
more
Less than 0.1 - 0.8 mm
0.3 mm
0.9 - 1.5 mm
0.3 mm or 0.1 - 0.8 mm
more
Less than
0.8 mm
0.9 - 1.5 mm
0.8 mm or 0.0 - 1.5 mm
more
Control Panel
PG by
PG Settings adjustment Saved as
pattern
--- PG1.2 or Depends on
PG1.6mm the condition
--- PG 2.6 mm For PG2.6 mm
NARROW PG 0.8 mm For PG0.8 mm
STANDARD PG 1.2 mm For PG1.2 mm
WIDE PG 1.6 mm For PG1.5 mm
WIDER PG 2.1 mm For PG2.1 mm
WIDEST PG 2.6 mm For PG2.6 mm
--- PG 2.6 mm For PG2.6 mm
NARROW PG 1.2 mm For PG1.2 mm
STANDARD PG 1.2 mm For PG1.2 mm
WIDE PG 1.6 mm For PG1.5 mm
WIDER PG 2.1 mm For PG2.1 mm
WIDEST PG 2.6 mm For PG2.6 mm
--- PG 2.6 mm For PG2.6 mm
--- PG 2.6 mm For PG2.6 mm
Revision B
Remarks
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