Epson LQ-1170, Service Manual

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REV.-A
5.5 REPAIR OF THE PRINTER MECHANISM
for detailed procedures for replacing or adjusting parts, refer to Chapter
3, Disassembly and Assembly,
and Chapter
4, Adjustment.
If a problem or symptom recurs following an attempted repair, refer to Table
5-5
to try to find other potential causes.
Table 5-6. Repair
of
the Printer Mechanism
Problem
Symptom Cause Checkpoint Solution
The carriage motor The carriage motor
Foreign substances Manually move the Remove any
fails to operate. completely fails to
are lodged in the timing belt to see if eign substances.
activate at power
gears or elsewhere this causes the mo-
on.
in the mechanism. tor to rotate.
The carriage motor
Measure the coil Replace the
is defective. of the
riage motor.
tor. The resistance
should be about
5.0 ohms.
The carriage does The carriage motor The belt pulley is Check for broken
Replace the belt
not operate rotates, but the defective. or worn pulley.
pulley.
at power on carriage does not
(after the carriage move.
The timing belt is Check that the
Reinsert the timing
has been manually
defective. ing belt is correctly belt.
centered prior to
inset-ted into the
power on).
bottom of the
carriage.
Check for a broken Replace the timing
timing belt. belt.
The carriage Carriage Check whether the Clean and
moves left slightly, ment is not carriage moves lubricate.
then stops. smooth. smoothly when
moved manually.
The carriage
moves to the left
or right end, then
stops.
The home position Use a multimeter to Replace the
sensor is defective. check the position sensor.
sensor.
Self-test printing
does not execute. The carriage
moves, but no
printing is
performed.
The printhead FFC Check the common Replace the FFC.
common wires are wires for the
disconnected. head FFC.
5-19