Brother Innov-is NX600, Руководство по обслуживанию

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6 - 10
Repair Manual
20 Bobbin winder
shaft not turning
Bad BW switch Replace BW switch (3-13) Bobbin winder
function Operate the bobbin
winder with Schappe
Spun Sewing Thread
#60, and confirm that
there is no uneven
bobbin winding or
abnormal noises.
(4-18)
Check that the amount
of thread wound onto
the bobbin is 80 – 90%
of the bobbin diameter.
(4-18)
BW switch connector
disconnected Plug connector in
BW switch attachment position
unsuitable Replace BW switch (3-13)
Bad main PCB assy. Replace main PCB assy. (3-25)
No play along the bobbin winder
shaft
Rubber washer on bobbin winder
shaft deformed. Replace bobbin winder
assembly
Replace bobbin winder
assembly Confirm that the vertical
play for the bobbin
winder shaft is 0.3 - 0.5
mm.
Bobbin winding
amount unsuitable Bad bobbin presser adjustment Adjust bobbin presser position
(4-18)
Loose bobbin presser
attachment screw Reassemble bobbin presser (3-
14)
Bobbin winder
winds unevenly Bad bobbin winder guide
assembly height adjustment
Loose bobbin winder guide
assembly screw Adjust the bobbin winder guide
assembly height
(4-18)
Abnormal sound
when the bobbin
winder rotates The bobbin is coming into
contact with the bobbin presser Remove the front cover, and
adjust the position using the
bobbin winder holder
attachment screw
(3-14)
Timing pulley scratches Repair scratches or replace
timing pulley
(3-5)
21 Foot controller not
effective
Bad foot controller Replace foot controller Foot controller
function Run the sewing
machine using the foot
controller, and check
that the sewing
machine speed
changes according to
the amount it is
pressed down.
Bad pin jack assy. contact point Replace pin jack assy. (2-10)
Bad main PCB assy. Replace main PCB assy. (3-25)
22 The presser foot
does not rise when
it is raised using
the knee lever
Presser foot does not rise Knee lifter
function Put the needle bar in
the highest position,
and raise the presser
foot with the feed dog
up.
When the knee lever is
used to raise the
presser foot, check that
it is 9 mm or more.
• Bad wire length adjustment Adjust knee lifter (4-21)
• Wire retaining ring
dislodged
Attach retaining ring (3-29)
• Loose horizontal shaft
screw
Tighten screw
Problem Primary factors and causes Repair method Items for
Inspection
Inspection method
and standards