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DFX-8500
sympml
A particular dot
does not print.
The print is too
iight or print
jensity is not
miform
‘Wing is
~rformad, but the
xinter does not
eed paper or
lees not feed it
:orrectly.
‘he ribbon feed
RF) motor does
lot operate.
Table 5-7
cause
The printhead is
defective.
The printhead is
defective.
The parallelism value
is incorrect.
The platen gap MIW
is incorrect.
Foreign objects are
lodged in the paper
path.
The PF motor is not
driving the gear
PropedY.
The PF m&r is
defective.
The ribbon cartridge
is defective.
Foreign objects are
caught in the gaars.
.P finter Mechanism Repair Z 4
Checkpoint
Measure the printhead coil resistance.
(Refer to Figure 5-4 for details.)
Check whether a dot wire is worn.
Check if the tiu of a dot wire is worn.
Print density diiers at the right and lefi
sides of the page (darker on one side
than the other).
Print density is tw light even the new
ribbon cartridge is mounted.
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 2.8 ohms + lo%.) Also
check the PF motor drivers.
Remove the ribbon cartridge, rotate it,
and check whether it feeds the ribbon
normally.
Shsck whether the ribbon driving gear
states when the cartridge is moved
nanually.
printhead.
Replace the
printhead.
Perform the
parallelism
adjustment, as
described in Section
4.x. x.
Perform the
parallelism
adjustment, as
described in Section
4.x. Y.
Remove any foreign
substances.
Check backlash
between PF motor
pinion gear and
paper feed reduction
gear.
Replace the PF
motor, and if driien
are bad, replace
main board at the
same time
Replace the ribbon
cartridge.
Remove any foreign
objects or replace
damaged ribbon
feed mechanism
part (the ribbon feed
select gear, ribbon
feed transmission
gear, or ribbon feed
gear).
5-24
Rev. A