The Janome 8077 is a high-performance sewing machine featuring computerized stitch selection, automatic needle threading, built-in stitch patterns, drop feed for free-motion sewing, adjustable stitch length and width, speed control, and built-in buttonhole functions. Designed for both home and professional use with easy maintenance access and comprehensive service capabilities. Below are key sections for technical specifications, maintenance procedures, troubleshooting, and service guidelines.
Key technical parameters: Stitch types, speed capabilities, motor specifications, and operational features.
| Feature | Specification |
|---|---|
| Built-in Stitches | 77 stitches including utility, decorative, and quilting |
| Stitch Width | Adjustable up to 7mm |
| Stitch Length | Adjustable up to 5mm |
| Maximum Sewing Speed | 820 stitches per minute |
| Needle Positions | 7 positions including center, left, and right |
| Buttonhole Styles | 6 one-step automatic buttonholes |
| Presser Feet | 6 included snap-on feet |
| Bobbin System | Top drop-in bobbin with clear cover |
| Needle Threader | Automatic built-in needle threader |
| Feed Dog | Drop feed system for free-motion sewing |
Major mechanical and electronic components requiring service attention.
WARNING! Disconnect power before servicing internal components. Use proper tools for adjustments.
Routine maintenance schedule and procedures for optimal performance.
CAUTION! Use only Janome-approved lubricants. Over-oiling can damage electronic components.
Critical mechanical adjustments for proper machine operation.
Needle Bar Height: Set so needle eye is 1.5mm above hook point at top dead center. Hook Timing: Align hook point with needle center when needle rises 2.2mm from lowest position. Feed Dog Timing: Adjust so feed dogs begin moving as needle enters fabric. Presser Foot Pressure: Adjust spring tension for different fabric types.
Timing procedures for straight stitch, zigzag, and decorative patterns.
Tip: Use timing gauge tool for precise alignment measurements.
Proper tension adjustment for balanced stitches.
WARNING! Do not over-tighten bobbin case screw. Use tension gauge for accurate settings.
Common error codes and diagnostic procedures.
| Error Code | Description | Resolution |
|---|---|---|
| E1 | Motor overload | Check for mechanical binding, clean motor |
| E2 | Position sensor error | Check sensor alignment and connections |
| E3 | Needle position fault | Reset machine, check handwheel movement |
| E4 | Memory error | Power cycle, check control board |
| E5 | Display communication error | Check ribbon cable connections |
Proper lubrication points and schedule.
Apply 1-2 drops of sewing machine oil to: Hook race, Needle bar bushings, Feed dog mechanism, Presser bar, Thread take-up lever, Handwheel shaft. Use white grease on: Gear trains, Cam followers. Frequency: Light oil every 8 hours of use, complete lubrication every 3 months.
Common replacement parts and procedures.
CAUTION! Use only genuine Janome replacement parts for optimal performance.
| Problem | Possible Cause | Corrective Action |
|---|---|---|
| Thread breaking | Burred needle, tension too tight | Replace needle, reduce tension, check thread path |
| Skip stitches | Wrong needle type, timing off | Use correct needle, check hook timing |
| Uneven stitches | Dirty feed dogs, tension imbalance | Clean feed dogs, balance tensions |
| Machine jams | Thread jam in hook, foreign objects | Remove bobbin case, clear obstruction |
| No power | Power cord, fuse, foot control | Check power source, test fuse, inspect pedal |
Reset Procedure: Turn off machine, hold function button while turning on to reset defaults.
Service Support: Contact authorized Janome service center for complex repairs.