Troubleshooting
LX-300 Service Manual
Table 5-9. Repairing the Printer Mechanism (Continued)
Problem
Symptom
Cause
Check Point
Solution
Measure the
printhead
coil
Replace the
resistance. It should be
approximately 33.3 ohms. If
printhead
(and
A particular
The
printhead
the
printhead
is
shorted,
ak)
drivers, if
dot is missing.
is defective.
check the drivers.
necessary).
Check to see if the dot wires
Replace the
Self-test
are worn.
printhead.
]rinting
is
~bnormal.
The
printhead
Check whether the tips of the
Replace the
The printing is
is
cfef=ti’Je”
wires are worn.
printhead.
too light, or
The platen
Set the gap adjustment lever to
Adjust the
the print
density is not
;:;:;ot
the first position, and check the
gap. Refer to
platen gap.
Section 4.1.1,
uniform.
adjusted.
The appropriate value is 0.45
Platen Gap
mm.
Adjustment.
Foreign
substances
Perform a visual cheek of the
Remove any
are lodged in
foreign
paper path.
the paper path
.
substances.
Remove any
foreign
substances.
Printing is per
- The PF motor
Check that no foreign
Replaoe
the
formed but the assembly is
PF motor
Paper feed is
~per
is
not
substance is lodged between
not driving the
the gears and that the gears
assembly
abnormal.
fed or is not
gear correctly
. are not broken or worn.
reduction
fed uniformly.
gears.
Replace the
paper pickup
gears.
Measure the coil resistance fo
r Replace the
The PF motor
the PF motor assembly. The PF motor
assembly is approximate value should be
assembly
defective. 56 ohms. If the motor is
(and drivers, if
shorted, also check the drivers
. necessary).
The ribbon
Remove the ribbon cartridge,
rotate its knob manually, and
Replace the
cartridge is
see if the ribbon feeds
ribbon
defective.
normally.
cartridge.
The ribbon
feed is
The ribbon is
Remove any
abnormal.
not turning.
Foreign
foreign
Check whether the
RD
ratchet
Suktam=
substances
are caught in
rotates when the carriage is
moved manually.
Replace the
the gears.
ribbon feed
mechanism.
5-14
Rev.A
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