Brother International EF4-B561 Service Manual - Page 39

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• WRONG CHAINING-OFF (Double Chain Stitch) CHECK POINT ADJUSTMENT I Wrong threading. 4 2 Excessive pressure of tension disc. ----. - Refer to threading diagram. Adjust to proper pressure. 3 Too weak pressure of tension disc. --. Adjust to proper pressure. 4 Wrong position of needle thread guide. - Adjust to proper position. 5 Wrong position of looper thread take-up. -.- Adjust to proper position. 6 Wrong installment of main feed dog and - differential feed dog. Adjust installment with the same level. 7 Wrong position of main feed dog. Adjust needle plate in light toutch with main feed dog. 8 Existance of clearance on the pressing part for chaining off of presser foot. Change it for a new one. PAGE 31 16 25 24 24 9 Wrong timing between needle and looper. --. Adjust to proper timing. 21 El EXCESSIVE WRINKLES CHECK POINT 1 Excessive pressure of tension disc. 1 2 Needle size too big. 3 Wrong differential ratio. 4 Bight too wide. 5 Knives are not sharp. ADJUSTMENT PAGE --. Adjust to proper pressure. 28 - Change it for a proper one suitable to needle and materials. --. Adjust to proper ratio. 27 - Adjust to proper bight. - Change it for a new one or reglind. 22 (In case of engagement of upper and lower knife is wrong, adjust engagement of these.) E SLIPAGE OF CLOTH CHECK POINT 1 Excessive pressure of pressure foot. 2 Knives are not sharp. 1 3 Feed dog too high. ADJUSTMENT PAGE Adjust to proper pressure. Change it for a new one or reglind. 22 (In case of engagement of upper and lower knife is wrong, adjust engagement of these.) Adjust to lower level than standard level. 24 - 37 -

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•
WRONG
CHAINING
-OFF
(Double
Chain
Stitch)
CHECK
POINT
ADJUSTMENT
PAGE
I
Wrong
threading.
4
2
Excessive
pressure
of
tension
disc.
3
Too
weak
pressure
of
tension
disc.
4
Wrong
position
of
needle
thread
guide.
5
Wrong
position
of
looper
thread
take-up.
6
Wrong
installment
of
main
feed
dog
and
differential
feed
dog.
7
Wrong
position
of
main
feed
dog.
----.
Refer
to
threading
diagram.
-
Adjust
to
proper
pressure.
--.
Adjust
to
proper
pressure.
-
Adjust
to
proper
position.
—-
.
Adjust
to
proper
position.
-
Adjust
installment
with
the
same
level.
Adjust
needle
plate
in
light
toutch
with
main
feed
dog.
8
Existance
of
clearance
on
the
pressing
part
Change
it
for
a
new
one.
for
chaining
off
of
presser
foot.
9
Wrong
timing
between
needle
and
looper.
--.
Adjust
to
proper
timing.
31
16
25
24
24
21
El
EXCESSIVE
WRINKLES
CHECK
POINT
ADJUSTMENT
PAGE
1
Excessive
pressure
of
tension
disc.
--.
Adjust
to
proper
pressure.
1
2
Needle
size
too
big.
3
Wrong
differential
ratio.
4
Bight
too
wide.
5
Knives
are
not
sharp.
-
Change
it
for
a
proper
one
suitable
to
needle
and
materials.
--.
Adjust
to
proper
ratio.
-
Adjust
to
proper
bight.
-
Change
it
for
a
new
one
or
reglind.
(In
case
of
engagement
of
upper
and
lower
knife
is
wrong,
adjust
engagement
of
these.)
28
27
22
E
SLIPAGE
OF
CLOTH
CHECK
POINT
ADJUSTMENT
PAGE
1
Excessive
pressure
of
pressure
foot.
Adjust
to
proper
pressure.
2
Knives
are
not
sharp.
1
3
Feed
dog
too
high.
Change
it
for
a
new
one
or
reglind.
(In
case
of
engagement
of
upper
and
lower
knife
is
wrong,
adjust
engagement
of
these.)
Adjust
to
lower
level
than
standard
level.
22
24
—
37
—