Epson WF-C5790 Service Manual page 146

EPSON WF-C5790/WF-C5790a/WF-C5710/ET-8700/WF-C5210/WF-C5290/WF-C5290a
 Troubleshooting
Step
Check the paper.
Check that the paper surface is flat.
Is a paper with a flat surface being used?
1
Check the settings.
2 • Check that the paper settings of the main unit/printer driver are appropriate.
• Make sure the print quality is set to Standard, or Quality First.
Check the nozzle check pattern
Print nozzle check patterns and check whether there are nozzles missing or deflection.
Nozzle condition is excellent?
3
Check the CR Scale.
Visually check the CR Scale to confirm that it is not dirty or damaged.
4
Is the CR Scale normal.
Check the CR operation
Check the following CR operation.
* Unlock the CR Unit before the following checks (refer to
Unit (P. 235))
 Move the CR left and right while holding the belt and check that it moves smoothly.
5
 Check that there is no foreign object on or damage to the CR Guide Frame.
 Check that the CR Timing Belt is not damaged or worn out.
Is there any problem with the check results of the above three points?
Troubleshooting
Check and measure
6.2.2.1 Unlocking the CR
Troubleshooting procedure
Yes
Change to the standard paper, or a paper without any folds or
creases.
 When the phenomenon is improved
Explain that the phenomenon is caused due to the paper,
Go to step 2
and make sure the standard paper free of any folds or
creases is used.
 When the phenomenon is not improved
Go to step 2
Change the settings.
Go to step 3 If the symptom continues to occur, go to step 3.
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)
Go to step 4
• CL3: No. of missing nozzles (21 or more)
* If nozzle missing is not improved, refer to
(P. 133).
If the symptom continues to occur, go to step 4.
 If the CR Scale is dirty
Clean the CR Scale with a dust-free cloth.
Go to step 5
 If there are scratches on the CR Scale
Replace the CR Scale
If the symptom continues to occur, go to step 5.
 When load is applied in the CR operation
Clean the CR Guide Frame and apply grease to it
 When foreign objects are adhering on the CR Guide Frame
Remove the foreign object.
 When there are scratches on the CR Guide Frame
Go to step 6
Replace the mechanical unit if there is damage on the CR
Guide Frame that may interfere with the CR operation.
490)
 If there are scratches or wear on the CR Timing Belt
Replace the CR Unit (CR Timing Belt)
Revision A
No
Nozzles missing
(p. 389).
(p. 588).
(p.
(p. 417).
146
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