Janome JR3303 Manual

The Janome JR3303 is a versatile 3/4 thread overlock sewing machine designed for professional-quality finishing. Features include differential feed for stretch fabrics, built-in rolled hem, easy threading system, free arm capability, adjustable stitch length (1-4mm) and width (3.5-7mm), built-in needle threader, and adjustable presser foot pressure. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Overlock sewing machine, differential feed system, free arm, built-in rolled hem, stitch length/width controls, built-in needle threader.

Feature	Description
Differential Feed	Prevents stretching or puckering on knit fabrics
Built-in Rolled Hem	Creates professional narrow hems on lightweight fabrics
Stitch Length Control	Adjustable from 1mm to 4mm
Stitch Width Control	Adjustable from 3.5mm to 7mm
Free Arm	For sewing cuffs, sleeves, and other tubular items
Built-in Needle Threader	Makes needle threading quick and easy
Presser Foot Pressure	Adjustable for different fabric types
Cutting Width	Adjustable up to 7mm
Looper Threading	Color-coded for easy threading
Power Switch	Convenient front-mounted control

Installation

Unpack and inspect contents. Place on stable sewing table.

1. Remove machine from packaging: Carefully lift machine from box.
2. Attach accessories: Install standard foot and other accessories as needed.
3. Connect power: Plug power cord into machine and wall outlet.
4. Install needle: Ensure needle is properly inserted with flat side to back.
5. Oil machine: Apply recommended oil to designated points before first use.

WARNING! Machine is heavy; lift with care to avoid injury. Ensure stable surface placement.

First-Time Setup

Power on machine; follow threading guide.

1. Thread machine: Follow color-coded threading path for upper and lower loopers.
2. Install needles: Use recommended Janome needles size 11/75 or 14/90.
3. Test stitches: Sew on scrap fabric to check tension and stitch formation.
4. Adjust settings: Set stitch length and width according to fabric type.
5. Practice techniques: Familiarize yourself with differential feed and rolled hem functions.

CAUTION! Keep fingers away from moving parts and needle area during operation.

Specifications

• Machine Type: 3/4 Thread Overlock
• Stitch Length: 1-4mm adjustable
• Stitch Width: 3.5-7mm adjustable
• Differential Feed: 0.7-2.0 ratio
• Speed: Up to 1300 stitches per minute
• Needles: HAx1 SP system, size 11/75 or 14/90
• Presser Feet: Standard overlock foot included
• Power Requirements: 110V, 60Hz
• Weight: Approximately 15.4 lbs (7kg)
• Warranty: 25-year limited warranty

Controls and Settings

Access controls via front panel. Main Controls: Power switch, stitch length dial, stitch width dial, differential feed dial, rolled hem lever.

Adjustment Dials: Stitch length (1-4mm), stitch width (3.5-7mm), differential feed (0.7-2.0), presser foot pressure.

Stitch Selection: 3-thread overlock, 3-thread rolled hem, 4-thread safety stitch, 2-thread rolled hem. Tension: Upper looper, lower looper, needle threads individually adjustable. Special Functions: Built-in rolled hem, differential feed, free arm conversion.

Threading Instructions

Follow color-coded threading path for proper operation.

1. Raise presser foot and needle to highest position.
2. Thread upper looper: Follow blue threading path from spool to looper.
3. Thread lower looper: Follow red threading path from spool to looper.
4. Thread needles: Use built-in needle threader for easy threading.
5. Pull threads under presser foot: Ensure all threads are properly positioned.

Tip: Always thread with presser foot raised to open tension discs.

Basic Operation

Supports various fabrics from lightweight to medium weight.

1. Prepare fabric: Place fabric under presser foot, lower presser foot lever.
2. Start sewing: Press foot control gently to begin stitching.
3. Guide fabric: Let machine feed fabric; do not pull or push.
4. Finish seam: Sew off edge of fabric to chain off, then cut threads.
5. Change settings: Adjust differential feed for stretch fabrics to prevent waving.
6. Create rolled hem: Move lever to rolled hem position for narrow hems.
7. Use free arm: Remove accessory compartment for sewing tubular items.
8. Clean regularly: Remove lint buildup after each project.

WARNING! Always disconnect power before changing needles or performing maintenance.

Stitch Selection

Multiple stitch options for different sewing applications.

Stitch Type	Threads Used	Applications
4-thread safety	2 needles, 2 loopers	Strong seams for woven fabrics
3-thread overlock	1 needle, 2 loopers	Basic overlooking and edging
3-thread rolled hem	1 needle, 2 loopers	Narrow hems on lightweight fabrics
2-thread rolled hem	1 needle, 1 looper	Decorative edging on sheers

Care & Maintenance

Unplug before cleaning. Remove lint regularly; oil as recommended.

1. Daily cleaning: Brush out lint from looper area and feed dogs.
2. Weekly maintenance: Oil designated points with Janome recommended oil.
3. Needle replacement: Change needles regularly or when damaged.
4. Storage: Cover machine when not in use to prevent dust accumulation.

CAUTION! Use only Janome recommended needles and accessories. Do not use compressed air for cleaning.

Regulatory Information

UL Listed: Complies with safety standards for household sewing machines. Copyright © Janome America, Inc. For support, visit www.janome.com or contact 1-800-631-0183. Made in Taiwan. This product conforms to applicable FCC rules.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Thread breaking	Incorrect threading/tension	Re-thread following color codes; adjust tension settings.
Uneven stitches	Differential feed setting	Adjust differential feed dial; test on scrap fabric.
Fabric not feeding	Presser foot pressure	Increase presser foot pressure; clean feed dogs.
Rolled hem not forming	Incorrect setup	Ensure rolled hem lever is properly engaged; adjust stitch width.
Machine skipping stitches	Needle/blunt needle	Replace with new Janome needle; ensure proper insertion.
Excessive noise	Lint buildup/needs oil	Clean lint from hook area; oil designated points.

Service: 1-800-631-0183; www.janome.com

Warranty: 25-year limited warranty on mechanical parts