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SEWING MACHINE DtV. 20 MODEL 384. 15358
CONDITION CAUSE HOW TO FIX REFERENCE
START WITH MEDIUM SPEED.3. BREAKING
UPPER
THREAD
4. BREAKING
BOBBIN
THREAD
5. NEEDLE
BREAKS
1. INITIAL SEWING SPEED IS
TOO FAST.
2. THREAD PATH IS
INCORRECT.
3. NEEDLE IS BENT OR DULL.
4. UPPER THREAD TENSION IS
TOO STRONG.
5. NEEDLE SIZE IS
INAPPROPRIATE FOR
FABRIC.
6. NEEDLE EYE IS WORN.
7. NEEDLE HOLE IN NEEDLE
PLATE IS WORN OR BURRED.
1. INCORRECTLY THREADED
BOBBIN CASE.
2. TOO MUCH THREAD IS
WOUND ON THE BOBBIN.
3. LINT IS STUCK INSIDE THE
HOOK RACE.
4. THREAD QUALITY IS
TOO LOW.
5. THREAD IS JAMMING
AROUND THE BOBBIN.
6. BOBBIN THREAD TENSION IS
TOO STRONG.
1. NEEDLE IS HITTING THE
NEEDLE PLATE.
2. NEEDLE IS BENT OR WORN.
3. NEEDLE IS HITTING THE
HOOK RACE.
4. THE FABRIC MOVES WHILE
THE NEEDLE IS PIERCING
IT, OR THE NEEDLE ZIGZAGS
WHILE IN FABRIC.
5. FABRIC IS BEING PULLED TOO
STRONGLY WHILE SEWING.
USE THE PROPER THREAD
PATH.
REPLACE WITH A NEW NEEDLE.
ADJUST UPPER THREAD
TENSION CORRECTLY.
USE APPROPRIATE NEEDLE
AND THREAD FOR FABRIC
IN USE.
CHANGE THE NEEDLE.
REPAIR THE HOLE OR
REPLACE THE NEEDLE PLATE.
THREAD BOBBIN CASE
CORRECTLY.
ADJUST THE POSITION OF
STOPPER.
CLEAN THE HOOK RACE.
CHANGE TO A HIGH QUALITY
SEWING THREAD.
CLEAR OUT THE JAMMING
THREAD.
ADJUST BOBBIN THREAD
TENSION CORRECTLY.
SEE MECHANICAL
ADJUSTMENT"NEEDLE DROP."
CHANGE THE NEEDLE.
SEE MECHANICAL
ADJUSTMENT"CLEARANCE
BETWEEN NEEDLE AND HOOK".
SEE MECHANICAL
ADJUSTMENT"NEEDLESWING".
GUIDE THE FABRIC GENTLY
WHILE SEWING.
P.11
P.12
P.15
P.16, 17
P.14