Kodak 7520 Scanner User Manual


 
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.