Table 3-13. Repairing the Printer Mechanism (continued)
Symptom Cause Checkpoint Solution
▼ Problem: Self test printing is not executed.
A particular dot is
missing.
The printhead is
defective.
Measure the printhead coil
resistance. It should be
about 8 ohms. If the
printhead is shorted, check
the drivers on the main
board.
Replace the
printhead, (and
drivers , if
necessary).
Check if the head wire is
broken.
Replace the
printhead.
The printing is too
light, or the print
density is uneven.
The printhead is
defective.
Check if the head wire is
broken.
Replace the
printhead.
The platen gap is not
properly adjusted.
Set the gap adjustment
lever to the first position,
and check for the correct
platen gap, 0.365 ± 0.015.
Adjust the platen
gap. Refer to
Chapter 5.
▼ Problem: Paper is fed abnormally.
The printer tries to
print, but paper is
not fed or not fed
Foreign matter is
lodged in the paper
path.
Check if any foreign matter
is lodged in the paper path.
Remove the
foreign matter.
constantly. The PF motor dose
not drive the
mechanism.
Check if any foreign matter
is lodged in the mechanism.
Remove the
foreign matter.
The PF motor is
defective.
Measure the motor coil
resistance. It should be
about 16 ohms. If the motor
is shorted, also check the
drivers on the main board.
Replace the PF
motor, (and
drivers , if
necessary).
▼ Problem: Ribbon operation is abnormal.
The ribbon is not
turning.
The ribbon cartridge is
defective.
Remove the ribbon cartridge
and check if the ribbon
feeds normally as you turn it
manually.
Replace the
ribbon cartridge.
Foreign matter is
lodged in the gears.
Check if the RD ratchet
rotates as you manually
move the carriage right and
left.
Remove the
foreign matter.
Otherwise,
replace the ribbon
feed mechanism.
The ribbon feeds
properly only when
the carriage moves
in one direction (i.e.,
it fails to feed when
the carriage moves
in the other
direction).
The planetary gear in
the ribbon drive gears
is defective.
Move the carriage manually,
and check if the ribbon feed
gears turn in reverse and
engages with the gear.
Replace the
ribbon feed
mechanism.
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