Epson LQ-510 Technical Manual page 188

REV.-A
Problem Symptom
Ribbon feed Ribbon is
s defective. not fed.
Ribbon
feeds
properly only defective.
with the car-
riage moving
in one
direction
(i.e., fails to
feed when
the carriage
moves in the
other
direction).
Paper Ink stains
becomes appear on
stained. areas where correctly
there is
printing.
Printing Printing
continues continues
past the end past the end defective.
of paper, or of paper.
when no
paper is in
place.
LQ-510
Table 5-8. Printer Mechanism Repair (Cont.)
Cause
Dismount the ribbon cartridge, rotate its knob manually, Replace the
Ribbon car-
tridge is and check whether the ribbon feeds normally.
defective.
Foreign Check whether the ribbon driving gear rotates when
substances the carriage is moved manually.
are caught
in the gears.
Move carriage manually, and check whether the
Planetary
lever is planetary lever turns in reverse and engages the gear.
Ribbon Check whether the ribbon mask is in the correct
mask is not position.
positioned.
Platen gap Set the gap to the second position, and check the gap
is adjusted.
between the tip of the printhead and the platen. The
appropriate value is 0.45 mm.
Paper-end
Check paper-end sensor switch.
sensor is
Checkpoint
TROUBLESHOOTING
Solution
ribbon
cartridge.
Remove any
foreign
substance.
Replace the
ribbon-feed
mechanism.
Replace the
ribbon-feed
mechanism.
Reset the
ribbon mask.
Adjust the
gap (refer to
Section
Platen
4.3.1,
Gap Adjust-
ment).
Replace the
paper-end
sensor.
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