Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 59

EPSON Stylus COLOR 680/777/777i
Table 3-20. Dot missing occur and it is not recovered with CL
Step
Detail phenomenon
No.
1. Check if the segment in
In the CL sequence,
the nozzle check patter
ink is ejected to the
is reduced every CL &
Waste ink pad (this
Nozzle check pattern
means pump unit & cap
printing.
unit are working
2
correctly). But, the dot 2. Check if any damage is
missing is not solved at observed on the Head
the specific nozzles FFC.
even if the several CLs
are performed.
1. Check if the Head FFC
In the CL sequence, ink
is connected to the CN8
is ejected to the Waste
and CN9 on the Main
ink pad. But, dot
board or Head FFC.
3 missing is occurred on
all nozzle in the printing
and is not solved in the
several CLs.
Troubleshooting
Check point Remedy
1. Replace the I/C with new
one in the I/C replacement
sequence.
2. Replace the Head FFC
with the new one.
3. Replace the printhead
with new one.
1. Connect the Head FFC
securely to the CN8 and
CN9 on the Main board or
Printhead.
2. Replace the Printhead
with new one.
3. Replace the Main board
with new one.
Troubleshooting with LED Error Indications
Table 3-21. Print quality is not good
Step
Detail phenomenon
No.
1. Check if each segment
is printed correctly in
the nozzle check
pattern.
2. Check if the surface of
the CR guide shaft dose
not have any sever
stain.
Vertical banding is
3. Check if the surface of
appeared against the CR
the CR sliding portion
movement direction.
on the Paper eject frame
And it looks like uneven
has enough oil.
printing.
1
CR movement
direction
4. Check if the CR guide
shaft is assembled in the
correct portion
securely.
5. Check if the surface of
the CR guide shaft is
flat.
6. Check if the surface of
the Paper eject frame is
flat.
Revision B
.
Check point Remedy
1. Perform the CL and check
the nozzle check pattern.
2. Clean the surface of the
CR guide shaft with the
dry soft cloth and
lubricate G-55 inside the
CR guide shaft.
3. Clean the surface of the
CR sliding portion on the
Paper eject frame and
lubricate specific amount
of the G-26.
G26 lubrication
4. Reassemble the CR guide
shaft into the mounting
slat on the both side frame
and secure it with Rod
spring.
5. Replace the CR guide
shaft with new one.
6. Replace the Paper eject
frame with new one.
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