Epson LQ-510 Technical Manual page 186

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