Brother International AIRFLOW 3000 Operation Manual - Page 29

Troubleshooting

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English 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 Remedy 1. Thread tangled Thread correctly. (See pages 14 - 19.) 2. Presser foot pressure too loose Turn the presser foot pressure adjustment screw clockwise to increase the presser foot pressure. (See page 9.) 1. Needles bent, or needle tip blunt Replace with new needles. (See page 12.) 2. Needles incorrectly installed Install needles correctly. (See page 12.) 3. Material pulled forcibly Do not press or pull material too hard when sewing. 1. Improper threading Thread correctly. (See pages 14 - 19.) 2. Thread tangled Check spool pin, thread holders, etc. and remove tangled thread. 3. Thread tension too tight Adjust the thread tension. (See pages 10 - 11.) 4. Needles incorrectly installed Install needles correctly. (See page 12.) 5. Wrong needles used Use correct needles. 130/705H - suggested (See page 12.) 1. Needles bent, or needle tip blunt Replace with new needles. (See page 12.) 2. Needles incorrectly installed Install needles correctly. (See page 12.) 3. Wrong needles used Use correct needles. 130/705H - suggested (See page 12.) 4. Improper threading Thread correctly. (See pages 14 - 19.) 5. Presser foot pressure too loose Turn the presser foot pressure adjustment screw clockwise to increase the presser foot pressure. (See page 9.) 6. Tip of two-thread-switching Insert the tip of the two-thread-switching plate not in eye of upper looper plate into the eye of the upper looper. (See pages 25 - 26.) 1. Thread tensions are not adjusted properly Adjust the thread tension. (See pages 10 - 11.) 2. Improper threading Thread correctly. (See page 14 - 19.) 1. Thread tension too tight Decrease thread tension when sewing lightweight or fine material. (See pages 10 - 11.) 2. Improper threading or thread Thread correctly. (See pages 14 - 19.) tangled 3. Differential feed ratio adjustment dial not set to appropriate scale marking Set the dial to an appropriate scale marking. (See page 9.) 27

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27
English
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
Cause
Remedy
1. Does not feed
1.
Thread tangled
Thread correctly. (See pages 14 - 19.)
2. Presser foot pressure too
loose
Turn the presser foot pressure
adjustment screw clockwise to increase
the presser foot pressure.
(See page 9.)
2. Needles break
1. Needles bent, or needle tip
blunt
Replace with new needles.
(See page 12.)
2. Needles incorrectly installed
Install needles correctly.
(See page 12.)
3.
Material pulled forcibly
Do not press or pull material too hard
when sewing.
3. Threads break
1.
Improper threading
Thread correctly. (See pages 14 - 19.)
2. Thread tangled
Check spool pin, thread holders, etc. and
remove tangled thread.
3. Thread tension too tight
Adjust the thread tension.
(See pages 10 - 11.)
4. Needles incorrectly installed
Install needles correctly.
(See page 12.)
5. Wrong needles used
Use correct needles.
130/705H - suggested
(See page 12.)
4. Skipped stitches
1. Needles bent, or needle tip
blunt
Replace with new needles.
(See page 12.)
2. Needles incorrectly installed
Install needles correctly.
(See page 12.)
3. Wrong needles used
Use correct needles.
130/705H - suggested
(See page 12.)
4.
Improper threading
Thread correctly. (See pages 14 - 19.)
5. Presser foot pressure too
loose
Turn the presser foot pressure
adjustment screw clockwise to increase
the presser foot pressure.
(See page 9.)
6. Tip of two-thread-switching
plate not in eye of upper looper
Insert the tip of the two-thread-switching
plate into the eye of the upper looper.
(See pages 25 - 26.)
5. Stitches are not uniform
1. Thread tensions are not
adjusted properly
Adjust the thread tension.
(See pages 10 - 11.)
2. Improper threading
Thread correctly. (See page 14 - 19.)
6. Fabric is puckered
1. Thread tension too tight
Decrease thread tension when sewing
lightweight or fine material.
(See pages 10 - 11.)
2. Improper threading or thread
tangled
Thread correctly. (See pages 14 - 19.)
3. Differential feed ratio
adjustment dial not set to
appropriate scale marking
Set the dial to an appropriate scale
marking.
(See page 9.)