Phenomenon
Condition
Cause
Level
Checkpoints and
Checking Method
Repair Method
2. Dots are
missing
continuously.
A specific dot is
not printed.
(1) A foreign substance is
attached to the heating
elements of the printhead.
A
•
Verify that nothing is
attached to the heating
elements of the printhead.
•
Clean the heating elements
of the printhead.
(2) The heating elements of the
printhead are damaged.
B
•
Verify that the heating
elements of the printhead
are not damaged.
•
If the heating elements are
damaged, replace the
thermal head.
(3) The signal line of the Head
cable is broken.
B
•
See Cause (2) of Phenomemon 1.
(4) The input pulse is defective.
A
•
See Cause (4) of Phenomenon 1.
3. Dots are
missing
occasionally.
Dots are
missing
occasionally or
the color of
some dots
becomes light.
(1) A foreign substance is
attached to the surface of
each platen roller.
A
•
Verify that nothing is
attached to the surface of
each platen roller.
•
Clean the surface of each
platen roller.
(2) The surface of each platen
roller is deformed.
A
•
Verify that the surface of
each platen roller is not
deformed.
•
If deformation is found,
replace the corresponding
platen roller ass’y.
(3) A foreign substance is
attached to the heating
elements of the printhead.
A
•
See Cause (1) of Phenomenon 2.
(4) The heating elements of the
printhead are damaged.
B
•
See Cause (2) of Phenomenon 2.
4. The printing
color is light.
The overall
printing color is
light.
(1) The head up lever position is
not correct.
A
•
Verify that the head up
lever is set to the correct
position.
•
Set the head up lever to
the printing position.
(2) Displaced or deformed
H-springs.
A
•
Make sure the H-springs
are correctly installed and
not deformed.
•
If they are not correctly
installed, reinstall properly.
Replace any deformed
H-spring with a new one.
(3) The H/C frame is warped.
B
•
Verify that the H/C frame is
not warped.
•
If the H/C frame is warped,
replace the head mounting
deck ass’y.
(4) The surface of the platen is
deformed.
A
•
See Cause (2) of Phenomenon 3.
(5) The heating elements of the
printhead have deteriorated.
B
•
Verify that the heating
elements of the printhead
have not deteriorated.
•
If any deterioration is
found, replace the thermal
head.
(6) The input pulse is defective.
A
•
See Cause (4) of Phenomenon 1.
(7) The roll paper is of poor
quality.
A
•
Verify that the specified-roll
paper is being used.
•
Use the specified quality
paper.
•
Check the paper for proper
color development and
excessive dust.
5. Paper
cannot be
loaded.
The end of the
roll paper
cannot be
inserted into the
paper guide
section.
(1) The leading edge of paper roll
is improperly cut .
A
•
Check that the leading
edge of the paper roll is
properly cut and is not
folded.
•
If the leading edge of the
paper roll is improperly cut,
cut it properly and insert
into the printer again.
(2) A piece of paper is blocking
the paper guide path.
A
•
Verify that no piece of
paper is blocking the paper
path.
•
Remove the paper.
Note:
When removing the piece
of paper be sure not to
damage the printhead and
platen roller with any tools.
