Section 4: Cleaning and Maintenance
TH2 Series Operator Manual
Page 4-5
4.4 EASY REPLACEMENT OF PARTS (Cont'd)
4.4.2 Releasing/ Replacing the Platen roller
1.
Make sure the printer is powered off and disconnect the
power cable. If the optional battery pack is installed, remove
it as well.
2.
Lift the
Top Cover
.
3.
Unfasten the
two screws
attaching the
gear cover
as
shown. Remove the screws and cover, and set them aside.
4.
Flip the
dispensing plate
upwards to a vertical position. A
click sound is heard.
5.
Lift up the defective
platen roller
assembly with the
dispensing plate
and replace it with a new one.
6.
Follow the above steps, in reverse sequence, to
reassemble the parts. Make sure that the
dispensing plate
snaps back into position.
Perform a label feed to ensure that the
platen roller
is
correctly assembled.
4.5 ADJUSTING PRINT QUALITY
Print quality can be optimized with regular cleaning and maintenance of the print head and components along
the media path. Additionally, you can fine-tune print quality by adjusting print darkness and print speed
settings.
When evaluating and adjusting the printer for optimum print quality, a barcode verifier system is highly
recommended for evaluating the printouts. The human eye is a poor judge of the relative widths of the bars in
a symbol, a characteristic that is extremely important for good barcode quality.
Print Darkness
This adjustment allows the user to control (within a specified range) the amount of power that is used to
activate the print head heating elements. It is important to find a proper print darkness level based on your
particular label. The printed images should not be too light, nor should the edges of text or graphics be
smudged. Instead, the edges of each image should be crisp and well-defined. The adjustment can be made
via the
PRINTER SETTING
menu.
Print Speed
The other method of controlling print quality is by controlling the speed at which the label is printed. It is
especially critical when printing
ladder
barcodes (barcodes printed with the bars parallel to the print line).
When printing a
ladder
barcode, it is important to allow the head to cool sufficiently before stepping to the next
position. If it does not have sufficient time to cool, the bar will be smeared on the trailing edge. The adjustment
can be made via the
PRINTER SETTING
menu. For more information, please refer to
Print Ctrl is selected in the SETUP menu
.
Gear cover
Screws x 2
1
2
Dispensing
plate