Brother International EF4-B561 Service Manual - Page 38

Needle, Breakage, Check, Point, Adjustment, Improper, Thread, Tension, Wrong, Chaining, Overlock,

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Page 38 highlights

A NEEDLE BREAKAGE CHECK POINT I Poor thread quality. 1 2 Needle size too small. 1 3 Needle is not center of needle plate slot. 1 4 Needle and looper out of proper relation. 5 Wrong adjustment of needle guard. ADJUSTMENT PAGE Use thread of good quality. Change it for more large one. Adjust to proper position. Adjust the position of needle guard and looper properly. 17 • 18 19 Adjust to proper position for needle guard. 19 • 21 IMPROPER THREAD TENSION CHECK POINT 1 Poor thread quality. 1 2 Needle size too small. 1 3 Too weak pressure of tension disc. 4 4 Wrong position of thread take-up. ADJUSTMENT --' Use thread of good quality. -.. Change it for more large one. -•-• Adjust to proper pressure. -. Adjust to proper position. PAGE 28 24 • 25 WRONG CHAINING-OFF (Overlock Stitch) CHECK POINT 1 Wrong threading. 4 2 Excessive pressure of tension disc. 1 3 Too weak pressure of tension disc. 1 4 Wrong position of looper thead take-up. 1 5 Wrong position of needle thread take-up. 1 6 Wrong installment of chain feed dog. 7 Needle plate has flaws. ADJUSTMENT -----* Refer to thread diagram. -,i• Adjust to proper pressure ---. Adjust to proper pressure. ----. Adjust to proper position. ----.• Adjust to proper position. --. Adjust to proper position. ----.• Change it for a new one, or smooth with stone oil and buff. PAGE 28 28 24 16 24 Flaws 8 Wrong timing between needle and looper. ----. Adjust to proper timing. 18 • 19 lE - 36 -

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A
NEEDLE
BREAKAGE
CHECK
POINT
ADJUSTMENT
PAGE
I
Poor
thread
quality.
Use
thread
of
good
quality.
1
2
Needle
size
too
small.
Change
it
for
more
large
one.
1
3
Needle
is
not
center
of
needle
plate
slot.
Adjust
to
proper
position.
1
4
Needle
and
looper
out
of
proper
relation.
Adjust
the
position
of
needle
guard
and
5
Wrong
adjustment
of
needle
guard.
looper
properly.
Adjust
to
proper
position
for
needle
guard.
17
•
18
19
19
•
21
IMPROPER
THREAD
TENSION
CHECK
POINT
ADJUSTMENT
PAGE
1
Poor
thread
quality.
--'
Use
thread
of
good
quality.
1
2
Needle
size
too
small.
—..
Change
it
for
more
large
one.
1
3
Too
weak
pressure
of
tension
disc.
—•-•
Adjust
to
proper
pressure.
28
4
4
Wrong
position
of
thread
take-up.
—.
Adjust
to
proper
position.
24
•
25
WRONG
CHAINING
-OFF
(Overlock
Stitch)
CHECK
POINT
ADJUSTMENT
PAGE
1
Wrong
threading.
-----*
4
Refer
to
thread
diagram.
2
Excessive
pressure
of
tension
disc.
—,i•
Adjust
to
proper
pressure
28
1
3
Too
weak
pressure
of
tension
disc.
---.
Adjust
to
proper
pressure.
28
1
4
Wrong
position
of
looper
thead
take-up.
----.
Adjust
to
proper
position.
24
1
5
Wrong
position
of
needle
thread
take-up.
----.•
Adjust
to
proper
position.
16
1
6
Wrong
installment
of
chain
feed
dog.
--.
Adjust
to
proper
position.
24
7
Needle
plate
has
flaws.
----.•
Change
it
for
a
new
one,
or
smooth
with
stone
oil
and
buff.
Flaws
8
Wrong
timing
between
needle
and
looper.
----.
Adjust
to
proper
timing.
18
•
19
-
36
-