Introduction
This manual provides essential instructions for the safe and efficient operation, maintenance, and troubleshooting of your SINGER Heavy Duty 6620C Computerized Sewing Machine. Please read this manual thoroughly before using the machine to ensure optimal performance and longevity.
Important Safety Instructions
When using an electrical appliance, basic safety precautions should always be followed, including the following:
- Always unplug the sewing machine from the electrical outlet immediately after using and before cleaning.
- Do not allow to be used as a toy. Close attention is necessary when this appliance is used by or near children.
- Use this appliance only for its intended use as described in this manual.
- Never operate this appliance if it has a damaged cord or plug, if it is not working properly, or if it has been dropped or damaged.
- Never drop or insert any object into any opening.
- Do not use outdoors.
- Do not operate where aerosol (spray) products are being used or where oxygen is being administered.
- To disconnect, turn all controls to the off position, then remove plug from outlet.
- Always unplug the machine when making any adjustments in the needle area, such as threading the machine, changing the needle, changing the bobbin, or changing the presser foot.
Setup
Unpacking and Placement
Carefully remove the machine from its packaging. Place the machine on a stable, flat surface. Ensure adequate lighting for your workspace.
Connecting Power and Foot Control
Locate the power cord and foot control. Plug the power cord into the machine's power input and then into a suitable electrical outlet. Connect the foot control to its designated port on the machine.
Video: SINGER C5200 Series - Introduction and Machine Tour. This video demonstrates the basic setup and overview of a similar SINGER sewing machine model, including power and foot control connections.
Winding the Bobbin
The SINGER 6620C features a top drop-in bobbin system. To wind a new bobbin:
- Place your thread spool on the spool pin.
- Guide the thread through the bobbin winding tension disc.
- Place an empty bobbin onto the bobbin winding spindle.
- Push the bobbin winding spindle to the right.
- Hold the thread end and gently press the foot control to start winding. The machine will stop automatically when the bobbin is full.
Video: SINGER C5200 Series - Introduction and Machine Tour. This video includes a demonstration of bobbin winding for a similar SINGER model.
Threading the Machine
The SINGER 6620C features an automatic needle threader for convenience.
- Raise the presser foot lifter.
- Place the thread spool on the main spool pin.
- Follow the numbered threading path indicated on the machine, ensuring the thread passes through all guides and the take-up lever.
- Lower the presser foot.
- Use the automatic needle threader to thread the needle effortlessly.
- Insert the wound bobbin into the bobbin case, ensuring the thread feeds correctly through the tension spring.
- Close the bobbin cover.
Video: SINGER C5200 Series - Introduction and Machine Tour. This video demonstrates the threading process for a similar SINGER model.
Operating Your Sewing Machine
Selecting Stitches
The SINGER 6620C offers 215 stitch applications. Use the touch-button controls and LCD screen to select your desired stitch. The LCD screen will display the stitch number, width, and length, along with recommended presser foot.
Image: Close-up of the SINGER 6620C's LCD screen and touch-button controls for stitch selection and adjustment.
Adjusting Stitch Length and Width
Adjust stitch length and width using the dedicated touch buttons next to the LCD screen. Refer to the stitch chart on the machine for optimal settings for each stitch type.
Sewing with the Reverse Lever
To reinforce stitches at the beginning and end of a seam, press and hold the reverse lever while sewing. The machine will sew backward as long as the lever is held down.
Using the Free Arm
To access the free arm, slide off the removable accessory storage compartment. The free arm is ideal for sewing cylindrical items such as cuffs, collars, and pant hems.
Image: The SINGER 6620C sewing machine with its accessory storage box detached, revealing the free arm for sewing cuffs and other small, circular items.
Adjusting Presser Foot Pressure
The presser foot pressure adjustment knob allows you to fine-tune the pressure on your fabric. Reduce pressure for delicate fabrics and increase it for thicker materials to ensure even feeding.
Image: Close-up of the adjustable presser foot pressure dial on the SINGER 6620C, allowing users to customize pressure for various fabric types.
Video: SINGER Heavy Duty 6620C. This video provides a general overview of the SINGER 6620C's features and operation.
Maintenance
Cleaning the Bobbin Area
Regularly clean the bobbin area to remove lint and thread buildup. Open the bobbin cover, remove the bobbin and bobbin case, and use the provided brush to clear any debris. This prevents thread jams and ensures smooth operation.
Changing Needles
Always use the correct needle type and size for your fabric. To change the needle, loosen the needle clamp screw, remove the old needle, insert the new needle with the flat side facing the back, and tighten the screw securely.
General Cleaning
Wipe down the exterior of the machine with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
Troubleshooting
Common Issues and Solutions
- Skipped Stitches: Ensure the needle is inserted correctly and is not bent. Use the appropriate needle type for your fabric. Re-thread the machine completely.
- Thread Breakage: Check for correct threading, proper tension settings, and ensure the needle is not dull or bent. Use quality thread.
- Fabric Jamming: Verify that the presser foot is lowered before sewing. Clean the bobbin area for any lint buildup.
- Uneven Stitches: Adjust the tension settings for both upper and bobbin threads. Ensure consistent fabric feeding.
Specifications
| Feature | Detail |
|---|---|
| Model Number | 6620C |
| Stitch Applications | 215 |
| Stitches Per Minute | Up to 1100 |
| Frame Material | Heavy Duty Metal |
| Bobbin Type | Top Drop-in |
| Needle Threader | Automatic |
| Display | LCD Screen |
| Product Dimensions | 17.3 x 7.5 x 10.9 inches |
| Item Weight | 16.24 pounds |
| Included Accessories | 9 presser feet, bobbins, needles, seam ripper, soft cover, etc. |
Warranty and Support
For warranty information, product registration, and additional support, please visit the official SINGER website or contact customer service. A free beginner's machine class is also available upon product registration.
