3. Maintenance and Adjustments
3-1. Cleaning the Printhead
Open the Front cover and back cover.
Press the printer lock (part 14) to loosen the printhead assembly.
Turn over the head assembly.
Use a soft cloth soaked with isopropyl alcohol to remove the stuck label and cleans the surface.
Put back the printhead and fasten it.
3-2. Label Gap Sensor Adjustment
Sensitivity adjustment by Auto sensing
The EZ-4TTP and EZ-4TKP printer is fitted with a label gap sensor that detects gaps between labels, as the
media is fed past the sensor during printing. Thus the firmware can determine the length of the labels and
control the media/ribbon feed accordingly.
The label gap sensor is a left-aligned photoelectric sensor that measures the light that passes through the
media path. The transparency of the liner (backing paper) of label supply may differ between batches,
making it difficult for the sensor to discriminate between labels and liner. When this occurs, the LED indicator
will switch from green to red, indicating that sensor should be adjusted by entering the Auto sensing mode,
as described below.
1.
Load the paper.
2.
Hold down the feed button when powering on.
3.
Release the feed button after the printer stop, then the printer will entering the Auto sensing mode.
4.
The printer will automatically adjust the label gap sensor and media feed according to the
characteristics of the media. After that, the printer goes into the dump mode.
5.
Press the feed button to end the Dump mode.
Adjusting the Sensor Position
When the start print position is too left or right, you can adjust the sensor position. No matter the plain paper
or label is used, the sensor position adjustment in same way. Please follow the steps.
1.
Choose the expected distance “x” (from the left edge to the start print position). In this case, we
suppose the distance is 4 mm (see figure 3.2.1).
2.
Turn over the printhead assembly.
3.
Move the gap sensor and choose the distance 4mm (from the left margin line to the digit “0” on ruler).
(See figure 3.2.2).
4.
Load the media and move the label guide to fit in the media’s edge.
5.
Put back and fasten the printhead assembly; then you can try to print a label to verify the start print
position.
X
start print
position
paper feed
direction
Fig. 3.2.1
0
Gap Sensor
Label
Guide
4mm
Left margin line
Fig. 3.2.2
14
