Troubleshooting - Singer 20U-105C Instruction Manual And Parts List

Whenever sewing difficulty is encountered, check and make adjustments as follows.
Problem
1. Is machine properly threaded
2. Are thread guides or tension disc area lint-free
3. Is needle-thread tension too tight
Needle thread
4. Is needle bent or has a blunt point
breaks
5. Is needle inserted correctly
6. Is needle the correct size for thread & fabric
7. Is poor quality thread
1. Is bobbin threading correct
2. Is thread tangled or caught
Bobbin thread
breaks
3. Is thread tension correct
4. Does bobbin rotate smoothly
1. Is needle inserted correctly
2. Is needle bent or has blunt needle point
Skip stitches
3. Is size of needle & thread suitable for fabric
4. Is threading correct
1. Is needle installed wrong
2. Is needle bent
Needle break
3. Is needle the correct size for the fabric
4. Is needle clamping screw loose
5. Is the fabric pulled while sewing
1. Is feed regulating dial properly adjusted
Fabric fails to
feed
2. Is presser foot pressure adjusted properly
1. Is needle threading correct
Fabric puckers
2. Is needle point blunt
3. Is thread tension too tight
1. Is there any lint or fluff on feed dog
Rotating heavy
noise
2. Is there any lint in rotating hook
1. Are electrical plugs properly connected
Machine fails to
start
2. Is power & light switch turned on
*** If you still have difficulty in sewing even after making adjustments,
contact your nearest Service Center.

Troubleshooting

Possible Causes
Zigzag Sewing Machine
Possible Solutions
1. Correct needle threading
2. Remove lint & fluffin bobbin case & hook
3. Adjust needle thread tension
4. Insert new needle
5. Insert needle correctly
6. Select proper needle size & thread
7. Change the thread
1. Correct bobbin threading
2. Untangle thread from bobbin case & hook
3. Adjust needle & bobbin case thread tension
4. Check whether bobbin thread is wound correctly
1. Insert needle correctly
2. Insert new needle
3. Select proper needle size & thread
4. Correct needle threading
1. Install needle correctly
2. Replace needle
3. Select proper needle & thread for fabric
4. Tighten needle set screw
5. Do not pull fabric while sewing
1. Lengthen stitch length by feed regulating dial
2. Adjust correct presser toot pressure
1. Correct needle threading
2. Replace needle
3. Adjust needle tension properly
1. Remove lint & fluff from feed dog
2. Remove lint & fluff from rotating hook
1. Turn on power switch
2. Connect plug to power source
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Instruction Manual and Parts List 28