Epson Stylus COLOR 800 Service Manual page 165

Symptom
Abnormal Cleaning is performed
printing 5 times or a newly
unpacked ink cartridge
is installed, but all dots
or most of the dots are
not printed in the nozzle
check pattern.
White banding
appears.
Image is not clear.
Rev. A
Table 5-13. Repair of the Printer Mechanism (4)
Description Possible cause
Pump unit does
not absorb the
ink.
Printhead is
defective.
Dot missing
PF roller is worn
or is smudged
with the ink.
Some teeth of
the gear (70)
broke off or the
gear is not
engaged with the
PF roller shaft
properly.
The driven roller
on the upper
paper guide is
worn or the
torsion spring
(117.6) has luck
of sufficient
tension.
Head gap or Bi-d
is no adjusted
adequately.
Head angular or
head vertical is
not adjusted
properly.
PG is too wide.
Dot missing
Checkpoint
1. Check if the ink
absorb tubes are
properly connected to
the cap assembly.
2. Check if the ink
absorb tubes are
twisted or damaged.
3. Check if the rubber
part of the cap
assembly is
deformed.
4. Check if the air valve
in the cap assembly is
damaged.
(In case the problem
still occurs after
attempting all the
checkpoints mentioned
above.)
Check the nozzle
condition by performing
Nozzle check.
Check the surface of
the PF roller.
Check the teeth of the
gear (70).
Check if the gear (70)
rotates constantly with
the torque form the PF
motor.
Check if the surface of
the driven roller on the
upper paper guide is
blakish or is lodged
with foreign
objects.Check if the
torsion spring is
deformed or hooked
securely.
Check the head gap
and Bi-d status by
using the printer driver
utility, adjusting
program, or control
panel.
Refer to 4-12 and 4-15
in Chapter 4.
Check the position of
the PG lever.
Check if the nozzles
are clogged by
performing Nozzle
check.
Troubleshooting
Solution
1. Connect the ink
absorb tubes to
the cap assembly
properly.
2. Replace the ink
absorb tubes or
the pump unit.
3. Replace the cap
assembly.
4. Replace the air
valve or the cap
assembly.
Replace the
printhead.
Refer to the solution
described in the
previous page.
Clean the PF roller
surface or replace
the PF roller.
Replace the gear
(70) or reinstall the
gear (70) properly.
Replace the driven
roller or the torsion
spring.
Remove the foreign
objects from the
surface of the driven
roller.
Perform adjusting
using the adjusting
utilities and
programs.
Refer to 4-12 and 4-
15 in Chapter 4.
Set the lever to "0".
Refer to the
corresponding
solution in the
previous page.
5-19