Fault Finding Chart - AEG 11681 Instruction Manual

FAULT FINDING CHART

Suspected
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
- Pulling fabric.
Irregular stitches - Loose presser foot.
- Unevenly wound bobbin
- Nicks or burrs at needle plate.
- Needle plate broken
- Wrong needles size for the fabric.
- The needle has not installed. The needle is curving.
- Pulling fabric.
- The needle clamp screw is loose.
Breaking needle - Rotate the pattern dial when needle insert the fabric.
- Loose presser foot.
- Upper and lower threads not drawn back under
Bunching of thread presser foot before starting seam.
- Incorrect thread tension.
- Upper thread improper threading.
- Using two different sizes or type thread.
Puckering - Bent or blunt needle.
- Loosen presser foot
- Fabric too sheer or too soft.
- Incorrect size needle.
Skipping stitches - Bent or blunt needle.
- Incorrect setting of needle.
- Improper threading.
- Starting to stitch too fast.
- Improper threading.
- Top thread tension too high.
- Incorrect setting of needle.
- Wrong needles and thread for the fabric.
Breaking upper - Set thread pool and the position indentation at left
thread side.
- Incorrect setting of bobbin case.
- Needle eye is sharp.
- Burrs on bobbin.
- Burrs on needle hole.
- Down thread improper threading.
Breaking bobbin - Down thread tension too high.
thread - Lint in bobbin or shuttle.
- Stitch length in "O" position.
- Scraps seize-up with feed-dog
Fabric not moving - Sewing thread integral convexity
- Didn't use the special-purpose bobbin.
Machine jamming - Thread caught in shuttle.
knocking noise
Sewing machine - The machine is not plugged in.
doesn't operate - Machine is not turned on.
Down thread is - Top thread tension too high.
pulled above the - Upper thread improper threading.
cloth. - Down thread improper threading.
When it is a vacant - LCD gets shut down
screen
When screen shows - To mention how to operate all conditions
as below
Probable cause
- 49 -
Possible easy correction
- Re-thread. See page 16
- Increase upper thread tension. See page 20
- Choose correct size needle.
- Re-thread. See page 16
- Tighten top tension. See page 20
- Gently pull the fabric.
- Re-set presser foot.
- Re-wind bobbin. See page 12、13
- Cleaning bobbin case and base. See page 47
- Change needle plate.
- Choose a needle to suit the thread and fabric.
- Re-set needle. See page 10
- Gently pull the fabric.
- Truly locks the needle clamp screw.
- When choice pattern, the needle must above the fabric.
- Re-set presser foot.
- Pull both threads under and back of presser foot, then
rotates the handwheel with right hand.
- Re-set thread tension. See page 20
- Re-thread. See page 16
- Use same size and type threads.
- Insert new needle.
- Re-set presser foot.
- Use underlay or tissue paper.
- Choose correct size needle for thread and fabric. See
page 22
- Insert new needle.
- Re-set needle. See page 10
- Re-thread. See page 16
- Start to stitch at a medium speed.
- Re-thread. See page 16
- Adjust top thread tension. See page 20
- Re-set needle. See page 10
- Choose correct needle and thread to suit the fabric. See
page 22
- Adjust position of the indentation to right side.
See page 12、13
- Re-set bobbin case. See page 47
- Replace new needle.
- Sand or change bobbin case.
- Sand or change needle plate.
- Re-thread. See page 14、15
- Adjust down thread tension. See page 20
- Clean bobbin case and shuttle. See page 47
- Adjust stitch length.
- Clean feed dog. See page 47
- Pull back upper and down threads under of presser foot.
- Replace special-purpose bobbin.
- Remove and clean shuttle. See page 47
- See page 9
- See page 9
- Adjust top thread tension. See page 20
- Re-thread. See page 16
- Re-thread. See page 14、15
- Turn off power
- Re-turn on power, re-setting all conditions as previous
ones
- See page 32