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TT420
Appendix G
Problem
LED not illuminated
LED blinks green
LED shows red
LED blinks red
Print shows smears or
blanks
Print shows blanks
and appears very
bright
Printer prints only on
every second label
Print shows vertical
white lines
Printer does not
transport the inserted
ribbon
Printer prints
sequence of
characters instead of
label format
Table 2 Troubleshooting
Operating instructions
Error messages
Cause
No power supply
Power supply unit faulty
The printer stays in PAUSE
mode
The top cover is not closed.
No ribbon inserted
The material is empty
The label sensor does not
detect the material
Paper jam
The top cover is not closed
properly
Print head dirty
Temperature too high
Unfavourable combination
of material and ribbon
Print roller worn
Temperature too low
Unfavourable combination
of material and ribbon
Print roller worn
Dimensions in software too
large
Print head dirty
Print head faulty (failure of
individual heating points)
Thermal direct print is
chosen via software
Printer is still in Dump
mode after status printout
Solution
Check power supply
Change power supply unit
Push FEED / PAUSE button, to
return to ONLINE mode
Close top cover and press FEED /
PAUSE button
Insert ribbon page 13)
Insert new material
Check sensor adjustment (page 18)
and calibration (page 41)
Remove material leftovers.
check print head, print roller and
sensor for dirt (page 36ff).
Push FEED / PAUSE button
Open and close top cover again
Clean print head (page 36)
Reduce temperature via driver
settings
Use different ribbon.
See recommendations (page 44)
Change print roller (page 39)
Enlarge temperature via driver
settings
Use different ribbon.
See recommendations (page 44)
Change print roller (page 39)
Change dimension in software, e.g.
label definition in TagPrint PRO.
Clean print head (page 36)
Change print head (page 37)
Change to thermal transfer printing
in software
End Dump mode by switching off
and on the printer
45
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