Service manual

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