3. Repair Guidelines
Phenomenon Condition Cause Level
Checkpoints and
Checking Method
Repair Method
1. Printing is
not executed.
Nothing is
printed.
(1) The Head cable is
disconnected.
A • Verify that the Head cable
is properly connected.
• If the FFC-head is not
properly connected,
connect it firmly.
(2) The common or signal line of
the Head cable is broken.
B • Check the common and
signal lines of the Head
cable for continuity.
• If continuity cannot be
confirmed, replace the
Head cable.
(3) The printhead does not
contact the platens.
A • Verify that the head up lever
is set to the proper position.
• Set the head up lever to the
printing position.
(4) The input pulse is defective B • Verify with the oscilloscope
that the input pulse is
within the specified range.
• If the input pulse is not
generated or is not within
the specified range, adjust
the drive control circuit.
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.
(2) Displaced or deformed
H-springs.
A • Make sure the H-springs are correctly installed and not
deformed.
(3) The H/C frame is warped. B • Verify that the H/C frame is not warped.
(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.
(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.
• Check the paper for proper color development and
excessive dust.
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