Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 60

EPSON Stylus COLOR 680/777/777i
Table 3-22. Print quality is not good
Step
Detail phenomenon
No.
1
Ditto
1. Check if each segment
is printed correctly in
the nozzle check
pattern.
2. Check if the suitable
paper is used
according to the
Micro banding appears
printer driver setting.
horizontally against the
3. Check if the Paper
paper feeding direction
feed roller is dirty.
and it appears with the
same width.
4. Check if the following
parts do not have any
damage.
2
• Combination gear 16,
CR movement
direction
21.6
• Combination gear
11.6, 36.8
• Spur gear 73.6
• Spur gear 25.6
Troubleshooting
Check point Remedy
7. Replace the following
parts.
• CR motor
• CR timing belt
• Compression spring 19.6
1. Perform the CL and
check the nozzle check
pattern. by using the
Adjustment program.
2. Use the suitable paper
according to the printer
driver setting.
3. Clean the surface of the
PF roller carefully with
the soft brush
4. Replace the damaged
parts with new one.
5. Replace the Printhead
with new one.
Troubleshooting with LED Error Indications
Table 3-23. Print quality is not good
Step
Detail phenomenon
No.
1. Check if the suitable
paper is used
according to the
printer driver setting.
3
Printing is blurred
2. Check if the correct
head ID is stored in the
EEPROM by using the
Adjustment program.
1. Check if the following
parts are stained with
ink.
• Upper paper driven
roller
• PF roller
• Paper guide front
• Paper eject roller.
2. Check if there is some
ink drops around the
backside of the
4 Ink stains the paper
printhead.
3. If the bottom area of
the printed paper has
ink stain, check if the
Paper eject frame is
secured with three
screws.
4. If the bottom area of
the printed paper has
ink stain, check if the
Paper eject frame is
bent upward.
Revision B
Check point Remedy
1. Use the suitable paper
according to the driver
setting.
2. Input 6 digits code of
the head ID into the
EEPROM by using the
Adjustment program.
1. Clean the ink stained
parts with soft cloth.
2. Wipe off the ink drop
with the soft cloth
carefully.
3. Secure the screws fixing
the Paper eject frame.
4. Replace the Paper eject
frame with new one.
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