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TROUBLESHOOTING
Rev. B
5-2
5
Table 5-7. Printer Mechanism Repair 3/4
Symptom Cause Checkpoint Solution
The RF motor
does not operate.
The parallelism value
is incorrect.
Check whether the carriage moves
smoothly when moved manually.
(Check that foreign objects are not
lodged in the printer mechanism.)
Perform the
parallelism
adjustment, as
described in Section
4.1.5.
The RF motor
does not operate.
The RF motor is
defective.
Check the coil resistance of the RF
motor. (It should be about 150 ohms +
10 %.)
Replace the RF
motor.
The PG motor
does not operate.
The backlash value is
incorrect.
Check whether the carriage guide shaft
rotates smoothly when rotated
manually.
Loosen the 2 screws
securing the PG
motor to the left side
frame. Then adjust
the backlash
between the PG
motor pinion gear
and the carriage
guide shaft gear, as
described in Chapter
4,
Adjustments
.
The PG encoder
sensor is defective
Check the output signal of the PG
encoder sensor. (Refer to Table 5-6.)
Replace the PG
encoder sensor.
The encoder plate is
defective.
Check whether the encoder plate is
broken or stained.
Replace the PG
motor or clean the
encoder plate.
The PG home sensor
is defective
Check the continuity of the sensor.
(Check the status of the two micro
switches.),
Replace the PG
home sensor (micro
switch type).
The PG motor is
defective.
Check the coil resistance of the PG
motor. (It should be about 250 ohms +
18 ohms.)
Replace the PG
motor.
Printing continues
past the end of
the paper.
The front, rear, or top
PE sensor is
defective.
Check the PE sensor. Replace the PE
sensor.
When paper jams,
the printer does
not beep.
The paper jam sensor
is defective.
Check the paper jam sensor. Replace the paper
jam sensor.
Ribbon Jam error
occurs even the
ribbon is fed
correctly.
Ribbon jam sensor is
defective.
Check the ribbon jam sensor. Replace the ribbon
jam sensor.