Epson Stylus COLOR 800 Service Manual page 165

Symptom
Abnormal
printing
Rev. A
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Table 5-13. Repair of the Printer Mechanism (4)
Description Possible cause
Cleaning is performed Pump unit does
5 times or a newly not absorb the
unpacked ink cartridge ink.
is installed, but all dots
or most of the dots are
not printed in the nozzle
check pattern.
Printhead is
defective.
White banding Dot missing
appears.
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.
Image is not clear. 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 1. Connect the ink
absorb tubes are
properly connected to
the cap assembly.
2. Check if the ink 2. Replace the ink
absorb tubes are
twisted or damaged.
3. Check if the rubber 3. Replace the cap
part of the cap
assembly is
4. Replace the air
deformed.
4. Check if the air valve
in the cap assembly is
damaged.
(In case the problem Replace the
still occurs after printhead.
attempting all the
checkpoints mentioned
above.)
Check the nozzle Refer to the solution
condition by performing described in the
Nozzle check. previous page.
Check the surface of Clean the PF roller
the PF roller. surface or replace
the PF roller.
Check the teeth of the Replace the gear
gear (70). (70) or reinstall the
Check if the gear (70) gear (70) properly.
rotates constantly with
the torque form the PF
motor.
Check if the surface of Replace the driven
the driven roller on the roller or the torsion
upper paper guide is spring.
blakish or is lodged Remove the foreign
with foreign objects from the
objects.Check if the surface of the driven
torsion spring is roller.
deformed or hooked
securely.
Check the head gap Perform adjusting
and Bi-d status by using the adjusting
using the printer driver utilities and
utility, adjusting programs.
program, or control
panel.
Refer to 4-12 and 4-15 Refer to 4-12 and 4-
in Chapter 4. 15 in Chapter 4.
Check the position of Set the lever to "0".
the PG lever.
Check if the nozzles Refer to the
are clogged by corresponding
performing Nozzle solution in the
check. previous page.
Troubleshooting
Solution
absorb tubes to
the cap assembly
properly.
absorb tubes or
the pump unit.
assembly.
valve or the cap
assembly.
5-19