Oki PT390 - Printing Quality Issues

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7-3. Printing-related Problems
Symptom
Causes
Corrective action
Printing does not
begin.
(1) The interface cable is
disconnected or broken.
(2) The printer setup is
incorrect.
(1) Connect the interface cable
correctly, or replace it.
(2) Set up the printer correctly.
Example: An incorrect baud
rate is set.
(See "C-3 Setting Up the
Printer.")
The printing is too
dark or blurry.
(1) The print density setting
included in the printer
setup is incorrect.
(2) The thermal head is
damaged.
(1) Adjust the print density and
print speed settings of the
printer so that they are
appropriate to the paper.
(See "C-3 Setting Up the
Printer.")
(2) Turn off the power, and ask
for repairs.
Printed characters
are thin (faint).
(1) The print density setting
included in the printer
setup is incorrect.
(2) The thermal head is
damaged.
(1) Adjust the print density and
print speed settings of the
printer so that they are
appropriate to the paper.
(See "C-3 Setting Up the
Printer.")
(2) Turn off the power, and ask
for repairs.
The print density is
uneven.
(1) Paper fragments or
foreign matter is stuck
on the heating elements
of the thermal head.
(2) The printer setup is
incorrect.
(3) Foreign matter is
adhering to the platen
roller.
(4) The thermal head is
damaged.
(1) Check and clean the thermal
head.
(2) Adjust the print density and
print speed settings of the
printer so that they are
appropriate to the paper.
Set up the printer correctly.
(See "C-3 Setting Up the
Printer.")
(3) Remove the foreign matter
from the platen roller.
(4) Turn off the power, and ask
for repairs.
Vertical marks
appear on the
printout.
(1) Foreign matter is stuck
or caught on the paper
transport.
(2) Foreign matter
is
adhering to the thermal
head
(
3) The thermal head is
damaged.
(1) Clean the paper transport.
(2) Clean the thermal head.
(3) Turn off the power, and ask
for repairs.