Kodak 7520 - Manual (Page 91)

8-16 A-61140 January 2000
Table 2 identifies the most common causes of low bar code
ratings/grades.
Table 2 — Common Causes of Low Bar Code Ratings
Field Problem Type Cause
W/N
NEW Dimensional Bar codes not printed according to
specifications (refer to Kodak publication Bar
Code Made Easy, A-61099).
Inaccurate measurements due to:
•
Ink smearing (improper curing)
•
Ink spreading (use of super-absorbent
paper)
•
Use of dot matrix printers (ragged edges)
RMIN
CONTRAST Reflectance Bar elements are too light often caused by:
•
Use of old ink ribbon
•
Hammer pressure too light
•
Defective/dirty print head
Space elements are too dark often caused by:
•
Dark colored paper background
•
Stain on paper
MOD Reflectance Bar code element edges are ragged rather than
straight often caused by use of a dot matrix
printer.
DEFECT Reflectance Bar elements contain voids (white spots) often
caused by:
•
Use of old ink ribbon
•
Hammer pressure too light
•
Defective/dirty print head
Space elements contain dark spots often
caused by:
•
Paper with flecks
•
Ink smearing (improper curing)
•
Ink spreading (use of super-absorbent
paper)
•
Defective/dirty print head
•
Toner contamination (if using a laser printer)
Upon completion of the test:
•
Remove the bar code from the imaging guide.
•
Press C to return to normal operation, or press Stop to remain in the
test environment.