LQ-300 Service Manual
Troubleshooting
5.4 REPAIRING THE PRINTER MECHANISM
For detailed procedures for replacing or adjusting parts, refer to Chapter 3,
Disassembly and
Assembly,
and Chapter 4,
Adjustments.
If a problem or symptom recurs
folIowing
an attempted
repair, refer to Table 5-8 and try to find other potential causes.
Table 5-8. Repairing the Printer Mechanism
Problem
Symptom
Cause
Checkpoint
Solution
The CR
motor
The CR motor
Foreign
Manually move the timing belt
Remove the
fails to operate.
fails to operate
substances
to see if the motor can rotate
foreign
the timing belt
are lodged in
freely.
substances.
after power on.
the gears or
elsewhere in
the
mechanism.
The CR motor
Measure the motor coil
Replace the
is defective.
resistance. It should be about
CR motor (and
19.6
Q.
If the motor is shorted,
drivers, if
also check the CR motor
necessary).
drivers on the main board
The carriage
The CR motor The belt
Check for broken or worn
Replace the
does not
rotates, but
pulleys are
pulleys.
belt pulleys.
operate when
the
oarriage defeotive.
turned on
does not move.
The
timing
belt
Ch=k
that
the timing belt
is
(after the
Reinsert the
carriage has
is defective.
inserted correctly into the
timing
been manually
bottom of the carriage.
belt.
centered prior
Check for a broken timing belt.
Replace the
to power on.)
timing
belt.
The carriage
The
oarriage Cheek whether the carriage
Clean and
moves to the movement is moves smoothly when moved
lubricate the
left slightly, not smooth. manually.
CR guide
then stops.
shaft. Replace
the CR motor.
The carnage
The HP
Use a
multimeter
to check the
Replace the
moves to the
sensor is
HP sensor.
HP sensor.
left or right
defective.
end, then
stops.
Self-test
The caniage
The
prirrthead
Check the common wires for
Replace the
printing is not
moves;
but
FFC
common the
printhead
FFC.
FFC.
executed.
does not print. wires are
disconnected.
The
printhead
Measure the
printhead
coil
Replace the
is bad.
resistance. It should be
printhead
(and
approximately 54.7
Q.
If the
drivers, if
Printhead
is shorted, also
necessary).
cheek the drivers.
Rev.A
5-13
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