TROUBLESHOOTING
REV.-A
Table 5-8. Printer Mechanism Repair (Cont.)
Problem Symptom
Cause
Checkpoint
Solution
Self-test
A particular Printhead is
Measure coil resistance of the printhead. The normal
Replace the
printing is
dot fails to
defective.
value is approx. 19.1 ohms.
printhead.
abnormal.
print.
Check whether the dot wire is broken.
Replace the
printhead.
Printing is
Printhead is
Check whether the tip of the dot wire is worn or not.
Replace the
too light, or defective.
printhead.
the print
density is
Platen gap
Set the gap adjust lever to the second position, and
Adjust the
is not
not uniform. properly
check the gap between the tip of the printhead and the
gap (refer to
platen. The appropriate value is 0.45 mm.
Section
adjusted.
4.3.1, Platen
Gap
Adjustment).
Paper feed
Printing is
Foreign
Perform a visual check of the paper path.
Remove any
is defective. performed,
substances
foreign
but the
are lodged
substances.
paper is not in the paper
fed, or is not path.
fed
0 Remove
uniformly.
Paper-feed
Check that no foreign substance is lodged between
motor is not
the gears, and that the gears are not broken or worn.
the foreign
driving the
substance.
gear
0 Replace
correctly.
the paper-
feed reduc-
tion gear.
l
Replace
the platen
gear.
Paper-feed
motor is
defective.
Measure coil resistance of the paper-feed motor.
The appropriate value is approximately 40 ohms.
Replace the
paper-feed
motor.
5-22
LQ-510
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