Epson DFX-5000+ Service Manual page 184

Table 5-7. Printer Mechanism Repair (continued)
Symptom
The carriage moves,
but no printing is
performed.
A particular dot does
not print.
The print is too light
or print density is not
uniform.
Printing is
performed, but the
printer does not feed
paper or does not
feed it correctly.
The ribbon feed (RF)
motor does not
operate.
EPSON DFX-5000+ Service Manual
Cause
The printhead FPC
common wires are
broken.
The printhead is
defective.
The printhead is
defective.
The printhead is
defective.
The parallelism
value is incorrect.
Foreign objects are
lodged in the paper
path.
The PF motor is not
driving the gear
properly.
The PF motor is
defective.
The ribbon cartridge
is defective.
Checkpoint
Check the continuity
of the common wires
for the printhead
FPC.
Measure the
printhead coil
resistance. (Refer to
Figure 5-4 for
details.) If anything
is shorted, check
printhead drivers.
Check whether a
dot wire is worn.
Check if the tip of a
dot wire is worn.
Print density differs
at the right and left
sides of the page
(darker on one side
than the other).
Visually check the
paper path.
Check whether the
PF motor pinion gear
rotates smoothly
when rotated
manually.
Measure coil
resistance for the PF
motor. (The correct
resistance is
approximately
ohms.) Also
2.85
check the PF motor
drivers.
Remove the ribbon
cartridge, rotate it,
and check whether it
feeds the ribbon
normally.
Troubleshooting
Solution
Replace the FPC.
Replace the
printhead.
Replace the
printhead.
Replace the
printhead.
Perform the
parallelism
adjustment, as
described in
Chapter 4.
Remove any foreign
substances.
Check backlash
between PF motor
pinion gear and
paper feed reduction
gear.
Replace the PF
motor, and if drivers
are bad,
replace main board
at the same time.
Replace the ribbon
cartridge.
5-17