19
8. Fault diagnosis
Fault phenomenon
Fault reason
Solution
Printer only feeds
paper during printing,
and has no printing
data.
Printing paper is
installed upside down.
Change printing
paper installation
direction.
Printer movement is
polluted due to
long-term not being
cleaned.
Movement needs to
be cleaned.
Printer prints blurrily
Printing paper
coloration is not good.
Please set higher
blackness or use
printing paper with
better coloration.
Printing paper quality is
not good.
Please use thermal
printing paper with
long retention
period.
Printed receipt
characters become
fuzzy within several
months or even
several weeks.
Preservation
temperature of receipt
is too high.
Please preserve
under normal
temperature (about
20 °C)
