18aa367c_ooting_Sewing_Machine_Problems__Symptom
[Root Cause] Thread tension is too tight. Needle is bent or blunt. Needle is wrong size. Needle and thread does not match. Thread take-up lever has not been threaded. Light pressure on presser foot. Incorrect setting of needle. [Corrective Action] Correct thread tension. Replace needle. Replace needle with correct size. Use proper thread or needle. Check threading order. Increase pressure on presser foot. Reset needle. [Symptom] 
Skipped stitches.
Troubleshooting Sewing Machine Problems
Symptom