Fault Finding Chart - AEG 11678 Bedienungsanleitung

FAULT FINDING CHART

Problem
Threads kink - Upper thread improper threading.
together under the - Upper tension dial at O position.
fabric.
- Incorrect size needle.
- Improper threading.
- Loosen top thread tension.
Irregular stitches - Pulling fabric.
- Loose presser foot.
- Uneven wound bobbin.
- Needle plate broken.
- Wrong needle size for the fabric.
- The needle is not installed. The needle is curving.
- Pulling fabric.
Breaking needle - The needle clamp screw is loose.
- The pattern dial is rotated when needle is in fabric.
- Loose presser foot.
- Upper and lower threads are not pulled back under
Bunching of thread presser foot before starting seam.
- Incorrect thread tension.
- Upper thread improper threading.
Puckering - Using two different sizes or type of thread.
- Bent or blunt needle.
- Loose presser foot.
- Fabric too thin or too soft.
- Wrong needle size.
Skipping stitches - Bent or blunt needle.
- Incorrect setting of needle.
- Improper threading.
Breaking upper - Starting to stitch too fast.
thread - Improper threading.
- Top thread tension too high.
- Incorrect setting of needle.
- Wrong needles and thread for the fabric.
- Set thread pool and the position indentation at left
side.
- Incorrect setting of bobbin case.
- Needle eye is sharp.
- Burrs on bobbin.
- Burrs on needle hole.
Breaking bobbin - Down thread improper threading.
thread - Down thread tension too high.
- Lint in bobbin or shuttle.
Fabric not moving - Stitch length in "O" position.
- Scraps in with feed-dog.
- Sewing thread entangled.
- feed dog position down.
Machine jamming - Thread caught in shuttle.
knocking noise
Sewing machine - The machine is not plugged in.
doesn't operate - Machine is not switched on.
Down thread is - Top thread tension too high.
pulled above the - Upper thread improper threading.
cloth. - Down thread improper threading.
Probable cause Possible easy correction
- Re-thread. See page 14
- Increase upper thread tension. See page 17
- Choose correct size needle.
- Re-thread. See page 14
- Tighten top tension. See page 17
- Gently lead the fabric.
- Re-set presser foot.
- Re-wind bobbin. See page 10、11
- Change needle plate.
- Choose a needle to suit the thread and fabric.
- Re-set needle. See page 8
- Gently pull the fabric.
- Tighten the needle clamp screw.
- Bring needle to its highest position before your choose a
pattern.
- Re-set presser foot.
- Pull both threads under and back of presser foot, then
rotate the hand wheel with right hand.
- Re-set thread tension. See page 17
- Re-thread. See page 14
- Use same size and type threads.
- Insert new needle.
- Re-set presser foot.
- Use underlay or vlies.
- Choose correct size needle for thread and fabric. See
page 19
- Insert new needle.
- Re-set needle. See page 8
- Re-thread. See page 14
- Start to stitch at a medium speed.
- Re-thread. See page 14
- Adjust top thread tension. See page 17
- Re-set needle. See page 8
- Choose correct needle and thread to suit the fabric. See
page 19
- Adjust position of the indentation to right side.
See page 10、11
- Re-set bobbin case. See page 35
- Replace new needle.
- Sand or change bobbin case.
- Insert needle again.
- Re-thread. See page 12、13
- Adjust thread tension. See page 18
- Clean bobbin case and shuttle. See page 35
- Adjust stitch length.
- Clean feed dog. See page 35
- Pull back upper and bobbin thread under of presser foot.
- Feed dog position up.
- Remove and clean shuttle. See page 35
- Plug in machine.
- switch on machine.
- Adjust top thread tension. See page 17
- Re-thread. See page 14
- Re-thread. See page 12、13
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