Printing-Related Problems - Oki PT390 Guia Del Usuario

7-3. Printing-related Problems

Symptom
Printing does not
begin.
The printing is too
dark or blurry.
Printed characters
are thin (faint).
The print density is
uneven.
Vertical marks
appear on the
printout.
Causes
(1) The interface cable is
disconnected or broken.
(2) The printer setup is
incorrect.
(1) The print density setting
included in the printer
setup is incorrect.
(2) The thermal head is
damaged.
(1) The print density setting
included in the printer
setup is incorrect.
(2) The thermal head is
damaged.
(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) 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.
Corrective action
(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.")
(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.
(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.
(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.
(1) Clean the paper transport.
(2) Clean the thermal head.
(3) Turn off the power, and ask
for repairs.
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