Epson Stylus Color 660 Service Manual page 186

EPSON Stylus Color 440/640/740
5.2.2.8 Head Angular Adjustment
During production, slight variations are created in printheads and
carriage (which are used as a printhead base.) If these differences are
not adjusted, they can adversely influence the printhead angle, and
color overlapping is not performed correctly and color/white line
problem occurs as a result. Therefore, in order to adjust the printhead
angle correctly, the exclusive lever for adjusting the printhead angle is
installed on the side of the carriage unit. By moving this lever, you are
able to adjust the printhead angle without removing the ink cartridge.
This adjustment is required in the following cases.


When a printhead is replaced.


When the carriage unit is replaced.


When the angle adjustment lever is moved.
Print the check pattern in the adjustment program to determine the
angle degree needed for the printhead. Then move the adjustment lever
in the carriage unit to set the printhead angle referring to the printed
check pattern.
C A U T I O N
Before or after performing this operation, refer to Table
5-2 and perform appropriate adjustments or
operations.
1. Remove the upper case from the main unit. (Refer to Chapter 4.)
NOTE:
If you perform this adjustment with the upper case installed, select
"Move the carriage to the head angular adjustment position" on
Current Head Angular Confirmation Menu (1) screen (Figure 5-26)
before loosening the screw.
Chapter 5 Adjustment
2. Apply the main menu (Figure 5-21). (See Section 5.2.2.2.)
3. By using the Up/Down arrow key, select Adjustment in the main
menu. By using the Up/Down arrow key, select Head Angular
Adjustment. The following screen appears.
Figure 5-26. Current Head Angular Confirmation Menu (1)
4. Select Head Angular Adjustment Pattern and press Enter key. The
screen below appears and the printer prints the head angular
adjustment pattern (Figure 5-28).
Figure 5-27. Current Head Angular Confirmation Menu (2)
Revision A
148