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.
ReK)air of the Printer Mechanism
Problem
Symptom
Cause
Checkpoint
Solution
The carriage motor
The carriage motor
Foreign substances
Manually move the
Remove any
for-
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
re-
Replace the
car-
is defective.
sistance of the
mo-
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
nor-
rotates, but the
defective. or worn pulley.
pulley.
really at power on
carriage does not
(after the carriage
The timing belt is
move.
Check that the
tim-
Reinsert the timing
has been manually
defective. ing belt is correctly
belt.
centered prior to
inserted into the
power on).
bottom of the
carriage.
Check for a broken
Replace the timing
timing belt.
belt.
The carriage Carriage move-
Check whether the
Clean and
moves left slightly, ment is not
carriage moves
lubricate.
then stops. smooth.
smoothly when
moved manually.
The carriage The home position
Use a multimeter to
Replace the
home-
moves to the left
sensor is defective.
check the
home-po-
position sensor.
or right end, then
sition sensor.
stops.
Self-test printing
The carriage The printhead
FFC
Check the common
Replace the
FFC.
~oes not execute.
moves, but no common wires are
wires for the
print-
printing is
disconnected.
head
FFC.
performed.
5-19
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