CAB MACH4 Service Manual page 22

 Adjustments

Screw for adjusting the printhead bend (4)
• Turning the screw clockwise will slightly bend the middle of the printhead downwards which will increase the
printhead pressure in the center.
In case the normal methods to prevent ribbon wrinkling are not successful, the printhead can be bent a little bit by
turning the screw clockwise. This must be done extremely carefully.
Warning!
!
Material damage!
As soon as a clear resistance is encountered, the screws should not be turned by more than a quarter-turn
maximum!
As a result, the print image may be lighter on the edges than in the center.
.. Adjusting
1. Load such media (label and transfer ribbon) which extends over the entire print width.
In the Printer Configuration set the heat level to 0 and the print speed to 100 mm/s.
2.
3. Loosen the screw for printhead bending (4) by turning it counter-clockwise until it turns noticeably easy. This
should occur after a maximum of half a turn.
4. Print out some test patterns with the test function "Test grid" or similar test labels.
5. If the horizontal lines in the test grid are not parallel in relation to the label edges adjust the parallelism by turning
the screws (2).
6. Turn the screws (3) for the printhead pressure clockwise until they turn noticeably easy.
Reduce the heat level in the Printer Configuration until the print image is very light and just recognizable. Under
7.
these conditions, adjustment inaccuracies will become clearly visible.
8. Print out some more test patterns with the test function "Test grid". Increase the printhead pressure on that side
where the print image is lighter. Turn the screws (3) counter-clockwise each by a quarter-turn until the print image
is even over the entire width.
It may be necessary to turn both screws alternately.
The darkness of the print image might still not be satisfactory.
9. Turn the screws (2) counter-clockwise and shift the printhead to the back until the print image almost disappears.
Now turn the screws (2) clockwise and shift the printhead to the front until the print image reaches the maximum
print darkness.
Attend to the parallelism of the horizontal lines to the label edge.
10. Now check the ribbon feed.
If the ribbon runs to the right turn the right screw (3) counter-clockwise in quarter-turns.
If the ribbon runs to the left turn the left screw (3) counter-clockwise in quarter-turns.
11. Check the ribbon feed after each adjustment step and wait until it runs stable.
12. If the adjustment of the ribbon is not successful (for example, if there are wrinkles on both sides at the same time)
the printhead must be bent.
In order to do that turn screw (4) clockwise.
This must be done extremely careful.
Warning!
!
Material damage!
As soon as a clear resistance is encountered, the screw (4) should not be turned by more than a quarter-
turn maximum!
Check the ribbon feed from time to time. Turn only as far as necessary.
A slightly lighter print image may be visible on the edges of the labels.
If there is no bending required, turn the screw (4) clockwise until the screw jams just a bit.
13. Set the heat level in the Printer Configuration back to 0 and check the result of the adjustments at this setting.
Use cab standard material for the test print. Ideally, the printout should show clearly outlined lines and evenly
black areas without blanks.