Brother International LT2-B845 MKII Instruction Manual - Multi - Page 90

Troubleshooting, Guide, Caution

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14. TROUBLESHOOTING GUIDE 14. FEHLERSUCHE 14. RECHERCHES DE PANNES 14. GUIA PARA LA LOCALIZACION DE FALLAS 14. TROUBLESHOOTING GUIDE Be sure to check the following before calling an authorized service station. A CAUTION • Turn off the power switch and disconnect the power cord before carrying out troubleshooting. The motor will keep turning even after the power is switched off as a result of the motor's inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is pressed by mistake, which could result in injury. Problem 1. Sewing machine pulley doesn't turn. Where to check • Is a breaker or fuse blown? • Is the power cord disconnected? • Is the V-belt installed? Page 16 0 1 I 2. Needle thread and bobbin • Is the needle tip bent? Is the needle tip blunt? 22 thread break. If the needle tip is bent or broken, replace the needle. • Is the needle properly installed? 22 If it is incorrect, install the needle correctly. --`1 • Is the machine properly threaded? If it is incorrect, thread the thread correctly. 30 - ,.. ", 'e i • Is the rotary hook properly lubricated? 46 If the oil level is below the lower reference line in the oil sight glass, add more oil. • Is dust or thread in the rotary hook? 46 Clean the rotary hook. • Is the upper thread tension too strong or too weak? 38 Adjust the upper thread tension. • Is the rotary hook, feed dog or other part damaged? If they are damaged, smooth them with an oiled grindstone or replace the damaged parts. 3. Seams don't match • Is the presser foot pressure too weak? 38 Adjust the presser foot pressure. • Is the feed dog too low? 48 Adjust the feed dog height. • Is the bobbin scratched? If the bobbin is damaged, smooth it with an oiled grindstone or replace it. • Is the V-belt tension too low? 16 Adjust so that there is 10-20 mm of deflection in the V-belt when it is pushed with a finger. - 75 - Model No. LT2-6840 Mark II (English) LT2-6870 Mark II (English)

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14.
TROUBLESHOOTING
GUIDE
14.
FEHLERSUCHE
14.
RECHERCHES
DE
PANNES
14.
GUIA
PARA
LA
LOCALIZACION
DE
FALLAS
14.
TROUBLESHOOTING
GUIDE
Be
sure
to
check
the
following
before
calling
an
authorized
service
station.
A
CAUTION
•
Turn
off
the
power
switch
and
disconnect
the
power
cord
before
carrying
out
troubleshooting.
The
motor
will
keep
turning
even
after
the
power
is
switched
off
as
a
result
of
the
motor's
inertia.
Wait
until
the
motor
stops
fully
before
starting
work.
The
machine
may
operate
if
the
treadle
is
pressed
by
mistake,
which
could
result
in
injury.
Problem
Where
to
check
Page
1.
Sewing
machine
pulley
•
Is
a
breaker
or
fuse
blown?
doesn't
turn.
•
Is
the
power
cord
disconnected?
•
Is
the
V
-belt
installed?
16
0
1
I
2.
Needle
thread
and
bobbin
•
Is
the
needle
tip
bent?
Is
the
needle
tip
blunt?
22
thread
break.
If
the
needle
tip
is
bent
or
broken,
replace
the
needle.
•
Is
the
needle
properly
installed?
22
If
it
is
incorrect,
install
the
needle
correctly.
--`1
•
Is
the
machine
properly
threaded?
If
it
is
incorrect, thread
the
thread
correctly.
30
•
Is
the
rotary
hook
properly
lubricated?
46
—
‘e
If
the
oil
level
is
below
the
lower
reference
line
in
the
oil
sight
glass,
add
more
oil.
•
Is
dust
or
thread
in
the
rotary
hook?
46
"
,..
,
i
Clean
the
rotary
hook.
•
Is
the
upper
thread
tension
too
strong
or
too
weak?
38
Adjust
the
upper
thread
tension.
•
Is
the
rotary
hook,
feed
dog
or
other
part
damaged?
If
they
are
damaged,
smooth
them
with
an
oiled
grindstone
or
re-
place
the
damaged
parts.
3.
Seams
don't
match.
•
Is
the
presser
foot
pressure
too
weak?
38
Adjust
the
presser
foot
pressure.
•
Is
the
feed
dog
too
low?
48
-------
—_
Adjust
the
feed
dog
height.
--
_
-
—,
--
_
---
-
--.
---.
•
Is
the
bobbin
scratched?
If
the
bobbin
is
damaged,
smooth
it
with
an
oiled
grindstone
or
re-
place
it.
•
Is
the
V
-belt
tension
too
low?
16
Adjust
so
that
there
is
10-20
mm
of
deflection
in
the
V
-belt
when
it
is
pushed
with
a
finger.
-
75
-
Model
No.
LT2-6840
Mark
II
(English)
LT2-6870
Mark
II
(English)