Epson FX 1170 Service Manual - Page 122

Repairing the Printer, Mechanism, REV.-A, ASSY.

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REV.-A 5.5 Repairing the Printer Mechanism ,~,...: q This section provides instructions for repairing the printer mechanism. It describes various problems, symptoms, likely causes, checkpoints, and solutions. The checkpoint column shows the items to be checked, including the proper values to be set for each component of the printer mechanism. For replacement and adjustment instructions, see Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustment. If the same symptom recurs after repair, select another item in the list of causes and repair the printer according to those instructions. Table 5-6. Repairing the Printer Mechanism Problem Carriage motor operation abnormal. Symptom The MOTOR, CR fails to rotate at power on. '5 Carriage movement The MOTOR, CR abnormal. rotates, but the carriage does not move. The carriage moves slightly to the left and then stops. The carriage moves to the left or right end and then stops. Cause Checkpoint Solution Foreign substances are lodged in the gears or elsewhere in the mechanism. Manually move the timing belt and check that this moves the belt pulley on the carriage motor. Remove any foreign substances. The MOTOR ASSY., CR is defective. Measure the coil resistance of the motor. The resistance should be approximately 5.0 ohms. Replace the MOTOR ASSY., CR. The belt pulley is defective. Check the pulley for damage or wear. Replace the belt pulley. The timing belt is defective. Check that the timing belt is properly inserted into the bottom of the carriage. Reinsert the timing belt. Check the timing belt for damage or wear. Replace the timing belt. Replace ICI. Lack of lubrication. Manually move the carriage and check that it moves smoothly. Clean and lubricate the carriage assembly. The DETECTOR, HP is defective. Check the DETECTOR, HP with a multi meter. Replace the DETECTOR, HP. k 1.--- ,f-', . . .. . 5-18

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REV.-A
5.5
Repairing the Printer
This section provides instructions
Mechanism
for repairing the printer mechanism. It describes various problems,
symptoms, likely causes, checkpoints, and solutions. The checkpoint column shows the items to be checked,
including the proper values to be set for each component of the printer mechanism. For replacement and
adjustment instructions, see Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustment. If the same
symptom recurs after repair, select another item in the list of causes and repair the printer according to those
instructions.
Table 5-6. Repairing the Printer Mechanism
Problem
Symptom
Cause
Checkpoint
Solution
Carriage motor
The MOTOR, CR
Foreign
Manually move the
Remove any
operation
fails to rotate at
substances are
timing belt and
foreign
abnormal.
power on.
lodged in the
check that this
substances.
gears or
moves the belt
‘5
elsewhere in the
pulley on the
mechanism.
carriage motor.
The MOTOR
ASSY.,
Measure the coil
Replace the
CR is defective.
resistance of the
MOTOR
ASSY.,
CR.
motor.
The resistance
should be
approximately 5.0
ohms.
Carriage movement
The MOTOR, CR
The belt pulley is
Check the pulley
Replace the belt
abnormal.
rotates, but the
defective.
for damage or
pulley.
carriage does not
wear.
move.
The timing belt is
Check that the
Reinsert the timing
defective.
timing belt is
belt.
properly inserted
into the bottom of
the carriage.
Check the timing
Replace the timing
belt for damage or
belt. Replace
ICI.
wear.
The carriage
Lack of lubrication.
Manually move the
Clean and lubricate
moves slightly to
carriage and check
the carriage
the left and then
that it moves
assembly.
stops.
smoothly.
The carriage
The DETECTOR,
Check the
Replace the
moves to the left
HP is defective.
DETECTOR, HP
with
DETECTOR, HP.
or right
end and
a multi meter.
then stops.
q
,~,.
..:
k
1.
---
,f-’,
.
.
.
.
.
5-18