Common problems with sewing machines include:
1. **Thread Bunching (Bird Nesting):**
- **Cause:** Incorrect threading, tension issues.
- **Fix:** Re-thread the machine, ensuring the presser foot is up. Check and adjust the tension settings.
2. **Needle Breakage:**
- **Cause:** Using the wrong needle type/size, hitting a hard object.
- **Fix:** Replace with the correct needle for the fabric. Ensure it is inserted correctly.
3. **Skipped Stitches:**
- **Cause:** Bent/dull needle, incorrect needle type, tension issues.
- **Fix:** Replace the needle, check threading, and adjust tension.
4. **Machine Not Sewing:**
- **Cause:** Machine not threaded properly, bobbin issues.
- **Fix:** Re-thread the machine and bobbin. Ensure the bobbin is inserted correctly.
5. **Fabric Not Feeding:**
- **Cause:** Feed dogs down, incorrect presser foot pressure.
- **Fix:** Raise feed dogs, adjust presser foot pressure.
6. **Machine Jamming:**
- **Cause:** Thread tangles, lint buildup.
- **Fix:** Clean the machine, remove lint, and re-thread.
7. **Uneven or Loose Stitches:**
- **Cause:** Tension imbalance, incorrect threading.
- **Fix:** Adjust tension settings, re-thread the machine.
8. **Noisy Operation:**
- **Cause:** Lack of lubrication, loose parts.
- **Fix:** Oil the machine as per the manual, tighten screws.
9. **Bobbin Winding Issues:**
- **Cause:** Incorrect bobbin placement, tension issues.
- **Fix:** Rewind the bobbin, check tension settings.
10. **Machine Not Turning On:**
- **Cause:** Power supply issues, blown fuse.
- **Fix:** Check power cord, replace fuse if necessary.
Regular maintenance, such as cleaning and oiling, can prevent many of these issues. Always refer to the machine's manual for specific troubleshooting and maintenance instructions.