Epson DFX-5000+ Service Manual page 185

Troubleshooting
Table 5-7. Printer Mechanism Repair (continued)
Symptom
The ribbon feed (RF)
motor does not
operate.
The RF motor does
not operate.
The PG motor does
not operate.
5-18
Cause
Foreign objects are
caught in the gears.
The parallelism
value is incorrect.
The RF motor is
defective.
The backlash value
is incorrect.
The PG sensor is
defective.
The encoder plate is
defective.
Checkpoint
Check whether the
ribbon driving gear
rotates when the
cartridge is moved
manually.
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.
EPSON DFX-5000+ Service Manual
Solution
Remove any foreign
objects or replace
damaged ribbon
feed mechanism part
(the ribbon feed
select gear, ribbon
feed transmission
gear, or ribbon feed
gear).
Perform the
parallelism
adjustment, as
described in
Chapter 4.
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,
Adjustments.
Replace the PG
sensor.
Replace the PG
motor or clean the
encoder plate.