REV.-A
TROUBLESHOOTING
5.3.3 PRINTER MECHANISM REPAIR
For detailed procedures for replacing or adjusting parts, refer to Sections 4.3, Disassembly and Reassembly,
and 4.4, Adjustment. If a problem or symptom recurs following an attempted repair, refer to the tables to
try to find other potential causes.
Table 5-8. Printer Mechanism Repair
Problem
Carriage
motor fails to
operate.
Symptom
Cause
Checkpoint
Solution
Carriage Foreign
Manually move the timing belt to see if this
Remove
motor com-
substances
causes the motor to rotate. Measure the
foreign
pletely fails to are lodged in
coil resistance of the
motor. The resistance
substances.
activate at the gears or should be about 11 ohms.
Replace the
power on. elsewhere in
carriage motor.
the mechanism.
The carriage
motor is
defective.
Carriage does
Carriage motor Belt pulley is
Check for broken or worn pulley.
Replace the
not operate
rotates,
but the defective.
belt pulley.
normally at
carriage does
power on not move.
The timing belt
Check that the timing belt is correctly
Reinsert the
(when the car-
is defective.
inserted into the bottom of the carriage.
timing belt.
riage has been
Check for a broken timing belt.
Replace the
manually
timing belt.
centered prior
Carriage moves Carriage Check whether the carriage moves smoothly Clean and
to power on).
slightly left,
movement is when moved imanually.
lubricate.
then stops. not smooth.
Carriage moves Home-position Use a tester to check the home-position
Replace the
to the left end,
sensor is
sensor.
home-position
then stops. defective.
sensor.
Self-test print-
Carriage
Common wires
Check the connector for the common wires
Replace the
ing does not
moves, but no
of the printhead of the printhead FFC.
FFC.
execute.
printing is
FFC are
performed.
disconnected.
Printing stops
Paper guide
Check whether the paper guide plate is
Reset the
before the page plate is not mounted in the right position.
paper
guide
end.
correctly
plate.
positioned.
LQ-510
5-21
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