Service manual

DFX-5000+ Service Manual
Troubleshooting
Table 5-7. Printer Mechanism Repair (continued)
Symptom
Cause Checkpoint
Solution
A particular dot does
The printhead is
Measure the
Replace the printhead.
not print.
defective.
printhead coil
resistance. (Refer to
Figure 5-4 for details.)
The printhead is Check whether a
Replace the printhead.
defective. dot wire is worn.
The print is too light or
The Pfinthead is
Check if the tip of a
Replace the
print density is not
defective. dot wire is worn.
printhead,
uniform.
The parallelism value
is incorrect.
Print density differs Perform the
at the right and left parallelism
sides of the page adjustment, as
(darker on one side
described in
than the other). Section 4.1.5.
Printing is performed,
Foreign objects are Visually check the
Remove any foreign
but the printer does
lodged in the paper paper path.
substances.
not feed paper or
path.
does not feed it
The PF motor is not Check whether the Check backlash
correctly.
driving the gear PF motor pinion gear
between PF motor
properly.
rotates smoothly
pinion gear and paper
when rotated
feed reduction gear.
manually.
The PF motor is Measure coil Replace the PF
defective. resistance for the PF motor, and if
motor. (The correct
drivers are bad,
resistance is
replace main board
approximately
at the same time.
2.85 ohms.) Also
check the PF motor
drivers.
The ribbon feed (RF)
The ribbon cartridge Remove the ribbon
Replace the ribbon
motor does not
is defective. cartridge, rotate it, cartridge.
operate.
and check whether it
feeds the ribbon
normally.
Foreign objects are
Check whether the Remove any foreign
caught in the gears.
ribbon driving gear objects or replace
rotates when the darnaged ribbon feed
cartridge is moved
mechanism part (the
manually. ribbon feed select
gear, ribbon feed
transmission gear, or
ribbon feed gear).
Rev. A
S-25