Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 52

EPSON Stylus COLOR 680/777/777i
Table 3-4. Error Condition and possible cause (continued)
Symptom
• Paper eject roller gear is disengaged from
Any error indication is not
the pump's gears.
displayed. But, the paper is
not ejected completely. • The Paper eject frame is not assembled in
Paper jam dose not occur. the Paper eject frame.
• Pump unit dose not absorb the ink from the
printhead.
• Cap unit dose not stick on the surface of the
Dot missing occur and it is
printhead completely.
not recovered with CL
• The printhead is broken.
• The head FFC has any damage.
• The main board is defective.
• The accuracy of the CR motor is lowered.
• The lack of the lubricant around the CR
unit.
Print quality is not good
• The both I/C is not held in the CR unit
• Vertical banding
securely.
• Horizontal banding
• The Paper eject frame is deformed.
• Printing is blurred
• Any foreign material is sticking around the
• Ink stains the paper
printhead.
• Paper feed accuracy is lowered.
• Printer driver setting is not suitable.
• Paper path has ink stain somewhere.
Troubleshooting
Possible Cause Check table
Figure 3-17
Figure 3-18
Figure 3-19
Figure 3-20
Table 3-21
Table 3-22
Table 3-23
Troubleshooting with LED Error Indications
If the problem fits to the detail phenomenon in the table, make sure the check point and
repair the product following the corresponding remedy mentioned in the table when
you find the defective parts in the check point.
Table 3-5. Paper out error indication
Step
Detail phenomenon
No.
• Check the surface of
ASF LD roller attempt
to load the paper.
1 But, paper is not
loaded at all. The LD
roller seems slipping.
Check point Remedy
• Set a cleaning sheet in
the LD roller if the the ASF up side down.
micro pearl or severe Then holding the top
smear is adhered. edge, try to load the
paper from the Printer
driver. The micro pearl
on the LD roller surface
is removed. To remove
severe smear, staple a
cloth moistened with
alcohol to a post card
and clean the roller in the
LD roller
same manner.
If it is no problem,
proceed the next step.
• If the problem is not
solved, replace the LD
roller with new one.
Revision B
52