Epson WF-C5790 Service Manual page 134

EPSON WF-C5790/WF-C5790a/WF-C5710/ET-8700/WF-C5210/WF-C5290/WF-C5290a
 Troubleshooting
Step
Check the nozzle check pattern
Print nozzle check patterns and check whether there are nozzles missing or deflection.
Nozzle condition is excellent?
1
Check the Inksystem Assy
Check the following point about the Inksystem Assy.
(Before implementation, refer to
the CR.)
1. Check the cap parts
• Check that the cap surfaces are not dirty.
2
• Manually turn the gear of the Inksystem Assy, move the cap up and down, and visually
check that the nozzle surface has been appropriately capped.
2. Check the wiper parts
• Check that there is not soiling or damage to the wiper parts
• Manually turn the gear of the Inksystem Assy, and make sure the wiper is properly
moving to the front and backward.
Inksystem Assy is correct condition?
Check the ink tubes
Visually check that air bubbles have not collected in the ink tubes.
3 (If there are parts where the color is unmistakably pale in the supply system ink tubes, air
bubbles may have collected.)
Ink tube is correct condition?
Replace the printhead.
4
Has the phenomenon (missing nozzle) been resolved?
Troubleshooting
Check and measure
"6.2.2.1 Unlocking the CR Unit (P. 235)", and then unlock
Yes
End (No reproduction)
Go to step 3
Go to step 4
End
Troubleshooting procedure
No
Execute the head cleaning.
The standard cleaning strength depending on the number of
missing nozzles is as described below.
• CL1: No. of missing nozzles (1 to 5)
• CL2: No. of missing nozzles (6 to 20)
• CL3: No. of missing nozzles (21 or more)
If the symptom continues to occur, go to step 3.
 When cap/wiper is dirty
Clean the cap surface / wiper part (p.
 When capping failure of the nozzle surface is confirmed
Replace the Inksystem Assy (p. 378).
 When the wiper part breakage / wiper operation failure is
confirmed
Replace the Inksystem Assy (p. 378).
If nozzle missing is not improved after performing the above,
go to step 3.
Execute the head cleaning and then check that the bubbles
have been removed from inside the tubes If nozzle missing is
not improved after performing the above, go to step 4.
Contact the EPSON Service Department.
Revision A
583).
134
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