Zebra 170PAX2 Series Guía de usuario descargar pdf (Pagina 85)

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Appendix D

Adjusting Darkness For “In-Spec” Bar Codes

All direct thermal and thermal transfer materials do not require the same darkness set-

ting. The best way to check for proper darkness is to use a bar code verifier that actually

measures bars/spaces and will calculate the print contrast. Without the assistance of a

verifier, your eyes and/or the system scanner are the best bet for choosing the optimal

darkness setting. What follows is a simple yet effective method for adjusting the dark-

ness to print “in-spec” bar codes.

1 Load media according to the appropriate media loading and ribbon loading instruc-

tions in “Getting Ready to Print.” Insure the proper print method has been selected

(see “Configuration and Calibration”).

2 To print a label for evaluation, turn the power off; then, press and hold the FEED

key. Next, turn the print engine power on and release the FEED key. The print

engine will begin printing test labels.

3 Print a label, then press the PAUSE key. The label will contain two bar codes, as

well as other print engine information. Normal bar codes are printed in a horizontal

(“picket fence”) format as they feed out of the print engine. Rotated bar codes are

printed in a vertical (“stepladder”) format.

4 Compare the test label printed to the bar codes in Figure 25 on page 84. If the test

label appears too dark or too light, refer to “Configuration and Calibration” and

increase or decrease the darkness setting accordingly.

5 Resume printing by pressing the PAUSE key again. Print a few labels at the new

setting and verify that proper “in-spec” bar codes are being printed. Repeat steps 3,

4 and 5 until satisfied.

6 To terminate the printing of the test labels, first press the PAUSE key and then press

the CANCEL key.

Too Dark

Labels that are too dark are fairly obvious. The normal bar code bars increase in size,

and the openings in small alphanumeric characters may fill in with ink. It may be read-

able but not “in-spec.” Rotated bar code bars and spaces will run together.

Slightly Dark

Slightly dark labels are not as obvious. The normal bar code will be “in-spec.” Small

character alpha numerics will be bold and could be slightly filled in. The rotated bar

code spaces are small when compared to the “in-spec” code, possibly making the code

unreadable.

Slightly Light

Slightly light labels are, in some cases, preferred to slightly dark ones for “in-spec” bar

codes. Both normal and rotated bar codes will be in spec, but small alphanumeric char-

acters may not be complete.

Too Light

Labels that are too light are obvious. Both normal and rotated bar codes have incom-

plete bars and spaces. Small alphanumeric characters are unreadable.

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Zebra 170PAX2 Series Guía de usuario Pagina 85

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