User manual

Preventive Maintenance
5-24 ProMaster 2500 User Manual
Corrective Adjustments
Changing Dot
Matrix Printer
Ribbon Cassette
Refer to the procedure on page 5-57.
Changing Thermal
Printer Ribbon
Refer to the procedure on page 5-59.
Adjusting Dot
Matrix Print Head
Gap
The print head gap is set at the factory and will not usually need to be
changed. If there are substantial changes in the thickness of the label or
label backing, however, you may need to make an adjustment. If the gap
between the platen and the print head is too wide, it may result in slanted
or fuzzy printing. If the gap is too narrow, the print ribbon may rub
against the labels, smudging them and making the background gray.
CAUTION: Dangerous high voltages are present. Do not perform this
procedure while power is on to the 2500. This procedure
should be performed only by a qualified service technician.
To adjust the print head height, follow these steps:
1. Turn off and unplug the 2500.
2. Remove the ribbon cartridge and labels.
3. Locate the two corner screws on the main plate that hold the plate in
position. Loosen these screws so the plate is free.
4. Lift the main plate so you can see inside the 2500’s base.
5. Locate the four hex screws on the back side of the print head that
hold it in position. Loosen the screws, but do not remove them.
6. When the print head is free to move, move it as far to the right as
possible, then adjust the gap between the print head and the
underside of the platen to approximately 0.018 inches.
7. Hold the print head in this position and tighten the four hex screws.