Maintenance
68
TTPM3 Printer/Encoder–Technical Manual
0705
8 MAINTENANCE
8.1 Fault
finding
In connection with service of the printer it is good practice to remove paper dust and lint
from the paper path, cutter and sensor areas. Paper dust, when accumulated, may
interfere with printer functions such as optical sensors.
To avoid smudging the paper, do not apply oil on the cutting knife.
Symptom Suggested
actions
Nothing is printed when you press
the feed button in self-test mode,
but the document is transported, cut
and ejected.
•
Check that the paper roll is turned the correct way with
thermal sensitive layer facing up.
•
Check that the paper used meets the paper
•
Check that the printhead cable is fully inserted into the
connectors at each end.
Paper jam
•
Check cutter-home sensor.
Printer does not work at all
•
Check that the printhead is closed.
•
Check that power is supplied to the printer.
•
Check the function of the paper-out sensor.
Self-test prints OK, but the printer
works strangely in normal operation.
•
Check that both ends of the interface cable are
properly connected.
•
Application program might be incorrect. Contact system
manager.
No cutting
•
Check that the connector for the cutting motor is fully
seated on the control board.
Bad cutting (uneven top and bottom
document edges).
•
Switch OFF printer and remove any obstructing paper
particles in cutter and presenter modules.
Inconsistent cutter operation
•
Check/clean cutter-home sensor.
Paper is fed straight through the
printer. Paper does not loop.
•
Check/clean presenter sensor.
•
Check setting of parameter p9.
Missing print or irregular spots.
•
Paper may be too humid. Let it adapt to ambient
temperature and humidity for approximately 24 hours
before use.
•
The paper used might not meet the paper specification.
White longitudinal lines in the printout.
•
Faulty print head, replace.
Faint print.
•
The paper used might not meet the paper specification.
•
Clean print head with ethyl or isopropyl alcohol.
•
Adjust print contrast, see page 60.
Strange characters or graphics
printed, or any kind of strange
printer behavior.
•
Might be caused by erroneous data sent from the host.
Check validity of transferred data.
Table 2. Faultfinding
