Diagraph PA/4000, Руководство по обслуживанию, Страница: 182 / 213

Technician’s Guide 2-44
disks. Reassemble and slide the collar back onto axle, making sure when tightening that
the set screw locates into the axle detent.
Printhead Pressure and Support Adjustment
The PA/4000’s printhead pressure comes from two springs in the head mount assembly
which apply a fixed 9.5 pounds of force upon the printhead. If greater or lesser head
pressure is desired, contact Diagraph Corporation at 1-800-521-3047.
Adjust printhead support if you are using media widths less than 3.5 inches.
The head support plate supports the outer end of the printhead when printing on
narrow labels. Without this support, the printhead would bear down on the drive roller,
causing diminished print quality and premature wear. Again, the head support plate
needs to be engaged only when the media width is less than 3.5 inches.
To make the adjustment, loosen the two mount screws that fasten the head support
plate, leaving the screw on the left slightly snug. Load the labels, then engage the
printhead by rotating the head lift lever to the down position. Next, turn the Head
Support Adjustment Screw clockwise until the support plate moves down and contacts
the bearing plate underneath. Tighten the two mount screws to secure the support
plate, and test to make sure the print is not dark on the outside edge.
NOTE: The mount screws which secure the head support plate also secure the
ribbon shield. When loosening these screws, be aware that both the
plate and the shield are adjustable. If you move one, the other may
move also.
NOTE: For narrow stock the head support plate should be adjusted so that the
print image on the outside edge of the label begins to lighten. Then
gradually lower the head support plate until the print quality becomes
acceptable. This should keep the printhead off of the roller. It would
be advisable for the print quality on the outer edge to be lighteróif
possible. This will ensure that the printhead does not come in contact
with the roller. When this procedure is done you will have to realign
the ribbon shield to compensate for ribbon tracking.
Printhead Alignment
When using heavier tag stock, the printhead may need to be adjusted forward. The
components involved in printhead alignment are illustrated below.
Adjust the horizontal placement of the printhead by turning the right and left ìhead
adjust screwsî which correspond to the right and left side of the printhead. Turning the
screws 1/2 turn counterclockwise will move the printhead .012" forward. Conversely,
1/2 turn clockwise will move the printhead back .012".