Bernina 840 Sewing Machine Manual

The Bernina 840 is a premium computerized sewing machine featuring advanced stitching capabilities, automatic needle threading, built-in embroidery functions, LCD touchscreen display, USB connectivity, multiple presser feet compatibility, adjustable sewing speed, and comprehensive stitch selection. Designed for professional and home use with precision engineering and user-friendly controls. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: LCD touchscreen display, Automatic needle threader, Built-in embroidery unit, USB port, Bobbin winding system, Speed control slider, Stitch selection dial, Presser foot lifter.

Installation & Setup

Unpack and inspect all components. Place on stable sewing table.

1. Remove packaging materials and protective covers from machine.
2. Attach power cord to machine and plug into grounded electrical outlet.
3. Install foot controller and connect to machine port.
4. Wind bobbin using built-in bobbin winding system.
5. Thread upper thread following numbered threading path.
6. Install appropriate presser foot for your sewing project.

WARNING! Machine is heavy; lift with both hands. Ensure stable surface to prevent tipping.

First-Time Operation

Power on machine; follow initial setup prompts on LCD screen.

1. Select language: Choose from available languages in SETTINGS menu.
2. Set date and time for embroidery file tracking.
3. Perform needle threading: Use automatic threader or manual method.
4. Load bobbin: Ensure bobbin rotates counterclockwise when pulled.
5. Test stitches: Use scrap fabric to test basic stitches and tension.
6. Calibrate embroidery unit if using embroidery functions.

CAUTION! Keep fingers away from needle area during operation. Always use proper presser foot.

Technical Specifications

• Machine Type: Computerized Sewing and Embroidery Machine
• Stitch Capacity: 200+ built-in stitches
• Embroidery Designs: 50 built-in designs, unlimited via USB
• Sewing Speed: 200-850 stitches per minute
• Needle System: HAx1 SP, 130/705 H
• Bobbin Type: Bernina Class 15 transparent bobbin
• Display: 3.5-inch full-color LCD touchscreen
• Connectivity: USB port for design import and updates
• Power Requirements: 110-120V, 60Hz (US/Canada models)
• Warranty: 20-year limited warranty

Controls and Functions

Access functions via touchscreen or physical controls. Front Panel: Power switch, Speed control slider, Stitch selection dial, Reverse stitch button.

Touchscreen Controls: Stitch selection, Embroidery editing, Settings menu, Help functions, Design import.

Basic Functions: Start/stop button, Needle up/down, Thread cutter, Reverse stitch, Speed control. Advanced Functions: Stitch length/width adjustment, Tension control, Mirror imaging, Stitch combination, Memory functions.

Stitch Selection & Settings

Access 200+ stitches through touchscreen categories: Utility, Decorative, Quilting, Buttonholes, Alphabets.

1. Select stitch category from main menu.
2. Choose specific stitch from visual library.
3. Adjust settings: Length (0.5-5.0mm), Width (0-9mm), Mirror, Memory.
4. Save frequently used stitches to favorites for quick access.
5. Use automatic buttonhole function for perfect buttonholes every time.

Tip: Always test stitches on scrap fabric before starting your project.

Embroidery Functions

Built-in embroidery unit with 50 designs and editing capabilities.

1. Attach embroidery unit: Slide into position until it clicks.
2. Select embroidery design from library or import via USB.
3. Hoop fabric securely in embroidery hoop.
4. Position hoop on embroidery unit and lower presser foot.
4. Edit designs: Resize, rotate, combine, or mirror using touchscreen.
5. Start embroidery: Machine will automatically trim jump stitches.
6. Monitor progress on LCD screen with estimated completion time.
7. Change colors when prompted; machine will stop automatically.

WARNING! Never move embroidery hoop during operation. Keep hands clear of moving parts.

Maintenance & Care

Regular maintenance ensures optimal performance and longevity.

1. Daily: Clean lint from bobbin area and feed dogs.
2. Weekly: Oil hook race and moving parts as per manual instructions.
3. Monthly: Clean and oil entire machine following maintenance schedule.
4. Needle Replacement: Change needle after every 8 hours of sewing.
5. Professional Service: Annual servicing recommended for heavy use.

CAUTION! Unplug machine before cleaning or maintenance. Use only Bernina recommended oils.

Accessories & Compatibility

Standard accessories included: Various presser feet, Bobbins, Needles, Seam ripper, Brush, Screwdriver, Power cord, Foot controller.

Regulatory Information

UL Listed: Complies with UL 1278 standard for sewing machines. FCC Part 15: Class B digital device compliant. CE Certified: Meets European safety standards. Copyright © 2025 Bernina International AG. All rights reserved. For technical support and service, contact authorized Bernina dealers or visit www.bernina.com.

Troubleshooting

Reset: Settings > System > Factory Reset if persistent issues occur.

Service: Contact authorized Bernina dealer or 1-800-BERNINA; www.bernina.com