Star Micronics TUP400 Series, Technical Manual

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4. Print-Density Adjustment
Adjust the print density in accordance with the sensitivity of the paper being used.
Fig. 1-5 Print-Density Adjustment
1. The variable resistor is located to the left of the interface connector on the back side of the printer.
2. Use a phillips screw driver to rotate the variable resistor to adjust the print density. The variable resistor will
rotate approximately 180
°
.
If you are not getting a good print on the thermal paper with the density set to its maximum at 2 Inch/sec print
speed, set the print speed to 1 Inch sec.
CAUTION
Avoid setting density too high for sensitive paper types. Excessive dark values may cause the paper
to swell which will degrade the quality of the image.
Variable Resistor
Approx. 90
Light Dark
Approx. 90