Specifications

REV.-B
5.4 REPAIR OF THE PRINTER MECHANISM
For detailed procedures for replacing or adjusting parts, refer to Chapter 3, Dkassemb/yandAssemb/y,
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 5-5. Repair of the PRINTER MECHANISM
Problem
Symptom Cause Checkpoint
Solution
The MOTOR, CR
The MOTOR, CR
Foreign substances
Manually move the Remove any for-
fails to operate.
completely fails to
are lodged in the
TIMING BELT to
eign substances.
activate at power gears or elsewhere
see if this causes
on. in the mechanism. the motor to rotate.
The MOTOR, CR is
Measure the coil
re- Replace the MO-
defective.
sistance of the
mo-
TOR, CR.
tor. The resistance
should be about
19.5 ohms.
The carriage does The MOTOR, CR The BELT PULLEY
Check for broken Replace the BELT
not operate nor-
rotates, but the is defective.
or worn pulley.
PULLEY.
really at power on
carriage does not
The TIMING BELT
Check that the
TIM- Reinsert the TIM-
[after the carriage
move.
has been manually
is defective.
ING BELT is cor-
ING BELT.
sentered prior to
rectly inserted into
the bottom of the
power on).
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
Replace the MO-
moved manually.
TOR. CR.
The carriage
The DETECTOR Use a multimeter to
Replace the
DE-
moves to the left ASSY., HP is check the
TECTOR ASSY.,
or right end, then defective.
‘“
DETECTOR ASSY., HP.
stops.
HP.
self-test printing
The carriage The printhead
FFC
Check the common Replace the FFC
~oes not execute. moves, but no (CABLE, HEAD,
wires for the print-
(CABLE, HEAD,
printing is
FRONT (, REAR) )
head FFC (CABLE, FRONT (, REAR) ).
performed.
common wires are
HEAD, FRONT
disconnected.
(, REAR) ).
I
5-17