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CHAPTER 6
TROUBLESHOOTING
This sewing machine is designed for trouble-free operation. However, the following chart indicates trouble
which may occur if basic adjustments are not made properly.
Trouble
1. Does not feed
2. Needles break
3. Threads break
4. Skipped stitches
5. Stitches are not uniform
6. Fabric is puckered
Cause
1. Thread tangled
2. Presser foot pressure too
loose
1. Needles bent, or needle tip
blunt
2. Needles incorrectly installed
3. Material pulled forcibly
1. Improper threading
2. Thread tangled
3. Thread tension too tight
4. Needles incorrectly installed
5. Wrong needles used
1. Needles bent, or needle tip
blunt
2. Needles incorrectly installed
3. Wrong needles used
4. Improper threading
5. Presser foot pressure too
loose
6. Tip of two-thread-switching
plate not in eye of upper looper
1. Thread tensions are not
adjusted properly
2. Improper threading
1. Thread tension too tight
2. Improper threading or thread
tangled
3. Differential feed ratio
adjustment dial not set to
appropriate scale marking
Remedy
Thread correctly. (See pages 14 - 19.)
Turn the presser foot pressure
adjustment screw clockwise to increase
the presser foot pressure.
(See page 9.)
Replace with new needles.
(See page 12.)
Install needles correctly.
(See page 12.)
Do not press or pull material too hard
when sewing.
Thread correctly. (See pages 14 - 19.)
Check spool pin, thread holders, etc. and
remove tangled thread.
Adjust the thread tension.
(See pages 10 - 11.)
Install needles correctly.
(See page 12.)
Use correct needles.
130/705H - suggested
(See page 12.)
Replace with new needles.
(See page 12.)
Install needles correctly.
(See page 12.)
Use correct needles.
130/705H - suggested
(See page 12.)
Thread correctly. (See pages 14 - 19.)
Turn the presser foot pressure
adjustment screw clockwise to increase
the presser foot pressure.
(See page 9.)
Insert the tip of the two-thread-switching
plate into the eye of the upper looper.
(See pages 25 - 26.)
Adjust the thread tension.
(See pages 10 - 11.)
Thread correctly. (See page 14 - 19.)
Decrease thread tension when sewing
lightweight or fine material.
(See pages 10 - 11.)
Thread correctly. (See pages 14 - 19.)
Set the dial to an appropriate scale
marking.
(See page 9.)
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