Epson Stylus Pro 7500, Service Manual

Page: 203 / 274

EPSON Stylus Pro 7500 Revision A
Adjustment Adjustment Steps 203
HEAD GAP ADJUSTMENT
This corrects the printing position between the B and C heads. For adjustment, uni-
directional printing is carried out and the print position error is judged in the printing
results. Adjustment items are as follows.
NOTE: The numbers in the above table are printed at the beginning of the
printing pattern when the adjustment pattern is printed and show the
adjustment pattern No.
1. When “Adjustment: Head Gap Adjustment” is displayed, press the [Enter] button.
2. All the adjustment patterns will be printed and the first adjustment item, “Gap, 200 ,
M: XXX” will be displayed.
Figure 5-30. Head Gap Check
Figure 5-31. Head Gap Adjustment Pattern
3. Check printing patterns No. 5 and No. 6, and check for deviation of the black vertical
lines in the 1st and 3rd pass and in the light cyan vertical lines in 2nd pass.
o
If black vertical lines and light cyan vertical line are lined up correctly in the
patterns in printing patterns No. 5 and No. 6, press the Paper Source button 2
times, then check if the message “Gap completed.” is displayed in the LCD.
Proceed to Step 6.
o
If black vertical lines and light cyan vertical line are not lined up correctly in the
patterns in printing patterns No. 5 or No. 6, press the Paper Type button to move to
the corresponding pattern adjustment menu, then input the appropriate numerical
values using the Paper Feed + / – keys. After inputting the correction value, press
the Enter button to print the results of the input correction values. The relationship
between the inputs using the Paper Feed + / – buttons and the printing results is as
shown below.
n
Adjustment value minimum resolution:1/2880 Inch
n
Correction Direction:Paper Feed – Button = Moves the black lines in the 1st and
3rd passes toward the HP side.
Paper Feed + Button = Moves the light cyan lines in
the 2nd pass away from the HP side.
n
Adjustment Target:There should be no deviation in the black lines and the light
cyan lines.
4. Repeat the above steps 3 and 4 until the adjustment of patterns No. 5 and No. 6 is
completed.
Table 5-11. Head Gap Adjustment
Item Description Number
Gap/200/M Head GAP adjustment / 240 cps / Normal Dot #5
Gap/300/N Head GAP adjustment / 333 cps / Normal Dot #6
Black Vertical
Lines
Light Cyan Vertical Lines
This pattern
has no relation
to the Gap
adjustment.