Brother CS8000 Series, Руководство по обслуживанию

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6 - 2
Repair Manual
Problem Primary factors and causes Repair method
Items for
Inspection
Inspection method and
standards
1 Stitch skipping
Thread fraying
Thread breakage
Seam unevenness
Needle breaks Needle tip smashed during sewing
Needle catches and bends before or
after sewing. Needle replacement Needle curvature Remove the needle, place
on level block (horizontal
block) and be sure there is
no curvature.
(4-2)
Needle smashed Touch the needle tip with
your finger, be sure that it
is not smashed.
(4-3)
2 Nothing displays on
LCD with power ON
or 7-SEG LED Inlet connector disconnection Plug connector in Sewing machine
runs when switched
on When the power is turned
on
there is a beep and the
LCD or 7-SEG LED is
displayed
Bad power supply unit S Replace power supply unit S
(3-36)
Fuse in power supply unit S is burned
out Replace power supply unit S fuse
Connector between power supply unit
S and main PCB disconnected Plug connector in (3-45)
Bad main PCB Replace main PCB assy. (3-32)
Connector between main PCB and
SS-VR PCB disconnected Plug connector in (3-41)
Bad contrast adjustment Adjust contrast
Main lamp (LED
lamp) does not light
(machine operation
normal) Bad LED lamp SR
LED lamp SR lead wire disconnect Replace LED lamp SR assy.
(3-41)
Bad LED lamp SL
LED lamp SL lead wire disconnect Replace LED lamp SL assy.
(3-12)
LED lamp SR connector disconnect Plug connector in (3-41)
LED lamp SL connector disconnect Plug connector in (3-12)
Bad main PCB Replace main PCB assy. (3-32)
Bad operation PCB Replace operation PCB assy.
(3-38) , (3-40)
Bad SS-VR F PCB Replace SS-VR F PCB (3-41)
Selection switch always on Reassemble bad switch
¦ Since two LED lamps are
connected in series, two go out
with one broken wire
3 Cassette display lamp
(green, red) does not
light Bad cassette switch Replace cassette switch (3-6) Display lamp lights with no
cassette inserted
Cassette switch connector
disconnection Plug cassette switch connector in (3-
33)
Bad main PCB Replace main PCB assy. (3-32)
4 Even when the
presser is raised with
a straight line pattern,
the sewing machine
will not run. Bad presser switch adjustment Adjust presser switch position (3-5) Presser switch
function
Bad presser switch Replace presser switch (3-5)
5 Straight line left base
line sewing
unevenness
(pitch)
Bad left-right needle drop adjustment Bad left-right needle drop adjustment
(3-62)
Three point drop
(divide left and
right) Needle should be in the
average right-left position
with respect to the needle
plate needle hole
(4-6)
Loose drop adjustment eccentric
screw Bad left-right needle drop adjustment
(3-62)
6 Stitch skipping, thread
abrasion
Thread breakage Bad needle interference adjustment Adjust needle interference (4-16) Needle and tip gap Lightly press the lower part
(cover part) of the SS
button while running on the
right base line, and check
for the faint sound of the
needle and tip hitting.
Loose needle interference adjustment
screw Adjust needle interference (4-16)
Bad front-back needle drop
adjustment Readjust front-back needle drop
(4-16)
Front-back needle
drop position Turn the pulley by hand,
and confirm that there is a
gap with the needle before
and after the needle plate
groove.
(3-28)
Bad needle plate attachment position Reattach the needle plate (3-77)
Bad needle bar rise adjustment Adjust needle bar rise (4-8) Needle bar rise
amount for needle
and rotary hook
meeting With a 2.9 – 3.3 mm rise
from the lowest point for
the needle, the tip of the
bobbin should come to the
left side of the needle.
(4-
8) (measure with gauge)
Loose timing adjustment screws Readjust needle and rotary hook
meeting
(4-8)
Bad needle bar height adjustment Adjust needle bar height (4-9) Needle bar height When the needle and
outside of the bobbin tip
meet when turning the
pulley on the left base line,
the distance from the top of
the needle hole to the
bottom of the bobbin tip
should be 1.0 –1.4 mm.
(4-9)
Loose timing adjustment screws Adjust needle bar height (4-9)
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