The Husqvarna 6690 is a professional-grade sewing machine featuring advanced electronic controls, multiple stitch patterns, automatic needle threading, built-in buttonholer, adjustable stitch length and width, free arm capability, LED lighting, and computerized memory functions. This service manual provides comprehensive technical information for maintenance, repair, and troubleshooting procedures. Below are key sections covering technical specifications, maintenance procedures, troubleshooting, and service guidelines.
Key technical parameters and performance characteristics of the Husqvarna 6690 sewing machine.
| Specification | Description |
|---|---|
| Power Requirements | 120V AC, 60Hz, 90W |
| Stitch Types | 200 built-in stitches including utility, decorative, and quilting |
| Maximum Stitch Length | 5.0mm |
| Maximum Stitch Width | 7.0mm |
| Speed Control | Electronic, up to 850 stitches per minute |
| Needle System | HAx1 SP |
| Bobbin Type | Class 15 transparent |
| Presser Foot Pressure | Adjustable 5-level system |
| Automatic Functions | Needle threader, thread cutter, needle position |
| Display | LCD screen with stitch selection and settings |
Essential safety guidelines for service technicians and users.
WARNING! High voltage components present risk of electric shock. Only qualified technicians should perform electrical repairs.
Routine maintenance schedule and procedures for optimal performance.
CAUTION! Use only recommended lubricants. Over-oiling can damage electronic components.
Detailed description of mechanical systems and their maintenance requirements.
Drive System: Direct drive motor with timing belt transmission. Feed Mechanism: Drop feed system with adjustable presser foot pressure. Hook Assembly: Rotary hook with automatic bobbin winding. Needle Bar: Precision ground needle bar with thread take-up lever.
Timing: Needle-hook timing critical at 2.5mm above needle plate at top dead center. Tension: Upper tension 0-9 scale, bobbin tension 180-220g pull test.
Common operational issues and their solutions.
Tip: Always start troubleshooting with simplest solutions first - check thread, needle, and power.
Step-by-step procedures for replacing common wear components.
WARNING! Always document wire connections before disassembly. Take photos for reference during reassembly.
Technical calibration steps for precision adjustment.
| Procedure | Specification | Tools Required |
|---|---|---|
| Needle-Hook Timing | 2.5mm above needle plate at TDC | Timing gauge, hex wrench set |
| Feed Dog Height | 1.0mm above needle plate | Feeler gauge, screwdriver |
| Bobbin Tension | 180-220g pull test | Tension gauge, small screwdriver |
| Presser Foot Pressure | Adjustable 1-5 scale | Pressure gauge, adjustment tool |
| Motor Speed Calibration | 850 SPM maximum | Tachometer, service software |
Electronic error codes and their meanings with resolution procedures.
E01: Motor overload - Check for mechanical binding, clean and lubricate. E02: Position sensor error - Verify sensor alignment and connections. E03: Memory error - Reset to factory settings. E04: Power supply fault - Check input voltage and main board. E05: Display communication error - Inspect ribbon cables and connectors.
Husqvarna 6690 sewing machine comes with 25-year limited warranty on mechanical parts and 5-year warranty on electronic components. Warranty covers defects in materials and workmanship when used under normal household conditions. Service must be performed by authorized Husqvarna service centers using genuine parts. For warranty claims, contact Husqvarna customer service at 1-800-487-5962 or visit www.husqvarnaviking.com.