1993–1995 Husqvarna 400 / 500 Sewing Machine Operating Manual (P/N 412 39 91-45 E)

This Husqvarna Sewing Machines AB operating manual covers the 1993–1995 Husqvarna 400 and 500 computerized sewing machines. The English/Spanish publication, printed in Sweden, carries reference 412 39 91–45 E and explains machine setup, programmed sewing, owner maintenance, and fault finding.

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• Setup and threading: Type FR2 foot control connections, upper and bobbin threading, bobbin winding, thread tension adjustment, presser-foot pressure, and needle replacement.

• Controls and memory: Model-specific Info-display functions, NORM/PROG/REP modes, stitch editing, mirror images, STOP programming, and CLR deletion.

• Buttonholes: Sewing with presser foot C, repeat buttonholes, density balancing, and the Model 500 buttonhole sensor foot with its display indicators.

• Sewing and fabric repair: Reinforced straight stitch, stretch stitch, three-step zigzag, flatlock overlapping, bridging stitches, gathering, overcasting, mending, and darning.

• Care and fault finding: Light-bulb replacement, stitch-plate removal and refitting, bobbin-area cleaning, feeding problems, thread breakage, and electronic overload protection.

Written for sewing-machine owners, the manual introduces the controls and sewing techniques through illustrated setup instructions, practical examples, and routine care guidance.

Info-display and Model-Specific Programming

The Model 500 adds a block-letter menu, lengthwise mirroring, selectable sewing speeds, and a needle-stop button. Separate control-panel explanations distinguish these functions from the Model 400 controls.

Programming coverage explains how to combine, edit, review, repeat, and delete patterns. The Model 400 excludes stitches 27–30 from its combination memory; the Model 500 excludes stitches 16–20. These utility stitches use their own repeat function in NORM mode, and the manual explains the flashing PROG indication when they are selected for combination programming.

Machine diagrams identify the thread take-up lever, bobbin spindle, presser-foot pressure dial, drop feed teeth, and other controls. The accessory-tray and extension-table illustrations show how the work surface and storage fit around the free arm.

Buttonhole Sensor and Sewing Applications

The Model 500 buttonhole sensor section explains measurement-wheel alignment, button sizing, and the display indications associated with blocked normal sewing. This helps owners distinguish a sensor-foot interlock from a fault needing repair.

A separate fault-finding entry covers buttonhole balance without the sensor foot. The buttonhole chapter also explains repeat-buttonhole programming and its restriction on stretch fabrics.

Sewing applications cover zipper insertion, straight-stitch needle positioning, decorative monograms, and Model 500 quilting and pictograms. Visual references include upper-threading drawings, bobbin-winding illustrations, stitch-selection charts, and buttonhole-measuring views.

Cleaning, Needle Care, and Fault Finding

The maintenance pages cover cleaning beneath the stitch plate and around the feed teeth and bobbin area. They also explain bulb replacement using the rubber sleeve accessory. The manual specifies routine cleaning without customer lubrication.

Fault finding connects poor stitching with threading, thread selection, needle condition, and tension. Further entries address sluggish running caused by lint buildup, stitches that differ from the display, and resetting the electronic overload protector when the main motor does not operate.

The safety section warns that an incorrect needle plate can cause needle breakage. Fault finding also identifies chipped stitch-plate openings as a cause of thread breakage.

Disconnect the machine from its power source before cleaning, removing covers, or replacing the bulb. Internal mechanical and electronic repair procedures, wiring diagrams, and factory calibration tolerances are outside this operating manual’s scope.

Accessory Identification and Applications

The accessory guide pairs illustrations and part numbers with brief application notes, including the dual feeder 412 35 73-45, ruffler 412 35 72-45, and eyelet cutter 412 36 53-45. Needle listings cover the 130/705 H system, twin needles, and specialized sewing applications.

The sewing sections explain clearance-plate use for thick seams and button shanks. Additional accessory entries describe darning, patchwork, gathering, and decorative-stitching feet.

English/Spanish PDF and Included Pages

The manual is supplied as one printable 60-page PDF with English and Spanish text. That total includes the front cover, safety and operating material with contents (pages 2–50), six needle/accessory pages (51–56), two index pages (57–58), the equipment-change notice (59), and the back-cover declaration of conformity (60).