Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer Service Manual page 163

Table 5-7. Printer Mechanism Repair (continued)
Symptom
The RF motor does
not operate.
The RF motor does
not operate.
The PG motor does
not operate.
Printing continues
paper.
5-26
Cause
The parallelism value
is incorred.
The RF motor is
defective.
The backlash value is
incorrect.
The PG sensor is
defective.
The encoder plate is
defective.
The PG home sensor
is defective.
The PG motor is
defective.
The front, rear, or top
PE sensor is
defective.
paper jam
The
sensor is defective.
Checkpoint
Check whether the
carriage moves
smoothly when
moved manually.
(Check that foreign
objects are not
lodged in the printer
mechanism.)
Check the coil
resistance of the RF
motor. (It should be
about 150 ohms.)
Check whether the
carriage guide shaft
rotates smoothly
when rotated
manually.
Check the output
signal of the PG
sensor. (Refer to
Table 5-6.)
Check whether the
encoder plate is
broken or stained.
Check the continuity
of the sensor.
(Check the status of
the two micru
switches.)
Check the coil
resistance of the PG
motor. (It should be
about 250 ohms.)
Check the PE sensor.
sensor.
Check the paper jam
jam sensor.
sensor.
Solution
Perform the
parallelism
adjustment, as
described in
Section 4.1.5.
Replace the RF motor.
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,
Replace the PG
sensor.
Replace the PG motor
or clean the encoder
plate.
Replace the PG home
sensor (micro switch
type).
Replace the PG motor.
Replace the PE
Replace the paper
Rev. A