Epson LQ-570 Service Manual page 39

REV.-A
5.5 REPAIR OF THE PRINTER
For detailed procedures for replacing or adjusting parts, refer to Chapter 3, Dimssemb/yandAswmb/y, and Chapter
4, Ao@hr?ent. If a problem or symptom recurs following an attempted repair, refer to Table 5-5 to try to find other
potential causes.
Problem
The carriage
The carriage motor
motor fails to completely fails to
operate. activate at power
on.
The carriage does
The carriage motor
not operate at rotates, but the
power on (after
carriage does not
the carriage has mwe.
been manually
centered prior to
power on.)
The carriage
moves left slightly,
then stops.
The carriage
moves to the left or
right end, then
stops.
Self-test printing
The carriage
does not execute. moves, but no
printing is
performed.
Table -. ReDair of the Printer Mechanism
Symptom
Foreign substances
are lodged in the
gears or elsewhere
in the mechanism.
The carriage motor
is defective.
The belt pulley is
defective.
The timing belt is
defective.
Carriage movement
is not smooth.
The home position
sensor is defective.
The printhead FFC
common wires are
disconnected.
Checkpoint
Manually move the
timing belt to see if
this causes the motor
to rotate.
Measure the coil
resistance of the
motor. The
resistance should be
about 19.5 ohms.
Check for broken or
worn pulley.
Check that the timing
belt is correctly
inserted into the
bottom of the
carriage.
Check for a broken
timing belt.
Check whether the
carriage moves
smoothly when
moved manually.
Use a multimeter to
check the home
position sensor.
Check the common
wires for the
5-17
Solution
Remove any
foreign
substances.
Replace the
carriage motor.
Replace the belt
pulley.
timing bett.
Replace the
timing belt.
Clean and
lubricate.
Replace the home
position sensor.
Replace the FFC.