UBI EasyCoder 501 – Service Manual
172
Symptom
Possible Cause
Remedy
Refer to
Overall weak printout
Printhead pressure too low
Adjust both knobs Chapter 24.3
Wrong Paper type setup
Check/change
Technical Manual
Low Contrast setup
Check/change
Technical Manual
Worn printhead
Check/replace
Chapter 8.7
Wrong printhead voltage
Check/repair CPU Chapter 26.3
Printout weaker on one side
Uneven printhead pressure
Adjust outer knob Chapter 24.3
Weak spots
Foreign particles on paper/ribbon
Remove
n.a.
Paper/ribbon don't match
Use other media
Technical Manual
Poor paper or ribbon quality
Use other media
Technical Manual
Worn printhead
Check/replace
Chapter 8.7
Worn pressing roller
Check/replace
Chapter 8.3
Overall dark printout
Printhead pressure too high
Adjust both knobs Chapter 24.3
Wrong Paper Type setup
Check/change
Technical Manual
High Contrast setup
Check/change
Technical Manual
Wrong printhead voltage
Check/repair CPU Chapter 26.3
Excessive bleeding
Printhead pressure too high
Adjust both knobs Chapter 24.3
Wrong Paper Type setup
Check/change
Technical Manual
Contrast setup too high
Check/change
Technical Manual
Faulty energy control
Check CPU board Chapter 26.3
Transfer ribbon breaks
Ribbon fitted around LSS
Check/adjust
n.a.
Wrong Paper Type setup
Check/change
Technical Manual
Ribbon unwind unit stuck
Check/adjust
Chapter 7.2
Bad energy control
Check CPU board Chapter 26.3
White parts at transfer printing
Transfer ribbon wrinkled
Adjust
See next paragraph
Transfer ribbon wrinkles
Incorrect paper guide ring adjustment
Adjust
User's Manual
Ribbon obstructed by printhead cable
Check/clear
n.a.
Too strong printhead pressure
Adjust both knobs Chapter 24.3
Bad ribbon return roller adjustment
Adjust
Chapter 24.3
Unwind bobbin not centre-aligned
Adjust
Chapter 7.2
Dark lines along paper web
Foreign objects on printhead or
ribbon guide plate
Check/clean
User's Manual
White lines along paper web
Printhead dirty
Check/clean
User's Manual
Missing dots on printhead
Replace printhead Chapter 8.7
Large part of dot line missing
Wrong X-start or Width setup
Check/change
Technical Manual
Failing printhead
Check/replace
Chapter 8.7
Failing strobe signal
Check CPU-board Chapter 26.3
Last part of label missing
Too small image buffer
Check/increase
Technical Manual
Printout missing along inner edge
Bad paper alignment
Adjust
User's Manual
X-start setup too low
Check/increase
Technical Manual
24.2
Possible Printout Troubles
24. PRINT QUALITY ADJUSTMENT, cont'd.