Epson LX-HOO Technical Manual page 116

Problem
The carriage
Carriage motor
motor does not
does not operate.
operate at all at
power ON.
The carriage
Carriage does not
motor rotates,
operate normally
but the carriage
at power ON.
(When the power does not move.
is turned on with
the carriage manu-
ally moved to its
The carriage
moves left
slightly and
stops.
times.
Printing is not per- The carriage
formed in Self- moves, but
Test. printing is not
performed at
all.
Printing stops
before the end
of a page.
Table 5-7. Printer Mechanism Unit Repair
Symptom
Foreign substances
are lodged in the
gears or
mechanism.
The carriage mo-
Defective belt driv-
en pulley assem-
pulley on the shaft
of the carriage
motor.
The timing belt is
defective.
Carriage movs-
ment is not
smooth.
Buzzer rings 5 The home position
sensor is
defective.
The common
wires of the head
cable are
disconnected.
The contact of the
head cable con-
nectors is poor.
The common
wires of the head
cable are
disconnected.
The paper guide
plate is not in the
right postion.
The paper guide is
weak.
Cause
Move the timing belt
manually and check if
the carriage motor
rotates.
Measure the coil resis-
. Resistance value:
Approx. 41.50 k 7%
Check for broken or
worn pulleys.
inserted correctly into
the bottom of the
carriage.
Check if the timing belt
is broken.
Check if the carriage
moves smoothly when it
is moved manually.
Check if the tension of
the timing belt is too
high.
Use an oscilloscope to
check the output
waveform.
Check the connector for
the common wires of the
head cable.
Check the connector con-
tinuity of the head cable.
Check the continuity of
the common wires in the
head cable.
Verify that the paper
guide plate is mounted in
the right position.
Verify that the paper
guide is effective.
5-15
Checkpoint
Remove any fore-
ign substances.
Replace the car-
Reinsert the tim-
Replace the tim-
Clean and
lubricate.
Replace the belt
tension spring.
Replace the
home position
sensor.
. Replace the
Reset the paper
guide plate.
Replace the pa-
per guide plate.
REV.-A
Solution
Replace the
belt driven pul-
Replace the
carriage motor.
cable.
Replace the