Weak Or Missing Printout Of Some Dots; Unexpected Black Printout (Completely Or Partial); Only Fi Rst Part Of Label Printed - Intermec EasyCoder 501 XP Service Manual

17.12 Printing Trou-
bles, cont.
Intermec EasyCoder 501 XP & 601 XP – Service Manual
Description:

Weak or missing printout of some dots.

Possible Causes and Suggested Remedies:
• Dirty printhead or pressing roller.
- Examine the printhead and the platen roller for dust, adhesive
residue, or visible damage.
- Clean or replace.
• One or two missing dots.
- May be due to mechanical damage to the printhead. Try to
establish why such damage have occurred in order to prevent
future failures of this kind. (Hard foreign particles, electro-
static discharge?)
- If the printer has been used for printing on less than full
width labels for some time, the platen roller and possibly also
the printhead may have become worn from the outer edge of
the media. This will show up when reverting to wider labels.
Replace the platen roller and possibly also the printhead.
• Preprinted ink has got stuck to the dot line.
- Avoid preprinted labels with ink that has a low melting point
(less than +225°C.)
• Many dots, or a block of dots, are missing.
- The internal IC circuit of the printhead is probably damaged.
Replace the printhead.
Description:
Unexpected black printout (completely or partially.)
Possible Causes and Suggested Remedies:
• Wrong printhead voltage.
- If the printer unexpectedly produces completely or partially
black printout, or prints a black line across the media at
startup, regardless of label layout, check the printhead voltage
+24V. If too high, in the range of 40 to 50V, the trouble prob-
ably originates from the power supply. Replace the power
supply unit.
- The printhead is most certainly damaged too and will also
need to be replaced.
Description:
Only fi rst part of label printed.
Possible Causes and Suggested Remedies:
• Bad headlift sensor adjustment.
- Adjust as described in Chapter 8.8.
Chapter 17 Troubleshooting
187