Repair Of The Printer Mechanism - Epson LQ-1070 Service Manual

5.4 REPAIR OF THE PRINTER MECHANISM

For detailed procedures for replacing or adjusting parts, refer to Chapter 3,
and Chapter 4,
Adjustment.
5-5 to try to find other potential causes.
Problem
The MOTOR, CR
fails to operate.
not operate nor-
really at power on
[after the carriage
has been manually
power on).
If a problem or symptom recurs following an attempted repair, refer to Table
Table 5-5. Repair of the PRINTER MECHANISM
Symptom
The MOTOR, CR
completely fails to
activate at power
on.
The MOTOR, CR The BELT PULLEY
rotates, but the
carriage does not
The TIMING BELT
move.
The carriage Carriage move-
moves left slightly, ment is not
then stops. smooth.
The carriage The DETECTOR
moves to the left
or right end, then defective.
stops.
The carriage The printhead FFC
moves, but no (CABLE, HEAD,
printing is FRONT (, REAR) )
performed. common wires are
disconnected.
Cause
Foreign substances
are lodged in the
gears or elsewhere
in the mechanism. the motor to rotate.
The MOTOR, CR is
defective.
should be about
Check for broken
is defective. or worn pulley.
Check that the TIM-
is defective.
the bottom of the
carriage.
Check for a broken
timing belt.
Check whether the
carriage moves
smoothly when
moved manually.
Use a multimeter to
check the
DETECTOR ASSY.,
HP.
Check the common
wires for the print-
head FFC (CABLE,
HEAD, FRONT
(, REAR) ).
5-17
Checkpoint
Manually move the
TIMING BELT to
see if this causes
Measure the coil re-
sistance of the mo-
19.5 ohms.
PULLEY.
Reinsert the TIM-
Replace the timing
belt.
Clean and
lubricate.
Replace the MO-
Replace the DE-
HP.
Replace the FFC
(CABLE, HEAD,
FRONT (, REAR) ).
Solution
Remove any for-
eign substances.
Replace the MO-
Replace the BELT