2009–2010 Husqvarna VIKING Designer Diamond Sewing Machine Service Manual & Parts Lists (P/N 104 72 94-26)

Husqvarna VIKING Designer Diamond service documentation for the 2009–2010 sewing and embroidery machine includes Service Manual 104 72 94-26 in two editions, plus two illustrated parts lists.

The ZIP contains four PDFs totaling 241 pages, including overlapping service-manual editions. The technical sections contain searchable PDF text; the seller-added introductory pages are image-only.

• Mechanical settings: Hook timing, needle-bar height, feed-dog alignment, presser-foot parallelism and stitch-balance calibration, with factory clearances and adjustment data.

• Sewing-head repair: Head removal and rebuilding, needle- and presser-bar bushing replacement, thread-tension unit and disc service, step-motor replacement and thread-cutter knife replacement.

• Service diagnostics: Motor calibration and sensor checks, touch-screen calibration, circuit-board connector identification and symptom-based fault finding for sewing and embroidery functions.

• Electronics repair: LCD and touch-screen removal, power-supply checks and replacement, main-board setup, serial-number entry and USB software updates.

• Embroidery-unit service: Cover removal, X- and Y-unit belt-tension checks, step-motor replacement, hoop detection and hoop-holder disassembly.

• Illustrated parts: Exploded assemblies and part-number indexes, including product-number-specific coverage and Version 1/Version 2 thread-take-up components.

These service instructions are written for workshop personnel with a thorough knowledge of precision appliances and access to the specified service tools.

Mechanical Settings and Calibration

The mechanical sections cover hook gear play, drive belt tension and feed unit sideways clearance. Needle-threader stop adjustment, presser-foot height, pivot height and upper and lower thread-tension settings are also documented.

The June 2010 edition adds a dedicated Balance service-menu section and separates stitch-length balance from side-motion balance. Its revised procedures specify software build 7393-5548 or later.

For sewing-head repair, the manual links dismantling and reassembly to the settings that must be checked afterward. The tension-disc exploded view shows the internal component arrangement. Listed service tools include needle-height gauge 412 35 29-02 and feed-dog lift gauge 413 12 73-01.

The feed-unit step motor has a left-hand-thread retaining screw; forcing it in the conventional loosening direction can damage the fastener or its mounting threads.

Electronic System and Service Diagnostics

The service program section documents motor control and sensor validation, including bobbin winding, thread monitoring, presser-foot position and hoop sensing. The Circuit board - Circuit diagram identifies cable connections and their colors; the power-supply connector view supplies pin references for electrical checks.

The Fault finding diagram Designer Diamond section separates a thread-cutter motor that will not operate from a cutter that moves but leaves thread uncut. That distinction helps a technician narrow the repair to drive/control faults or knife and fetcher problems.

Main-board replacement is followed by specified setup checks for presser-foot travel, pivot position, thread tension and stitch balance. The manual also documents software memory updates via USB and entering the machine serial number after replacing the main circuit board.

Disconnect the machine from power before removing covers, the power supply or circuit board. Circuit-board handling also requires ESD precautions to prevent damage to the electronics.

Embroidery Unit and Parts Identification

Embroidery-unit procedures cover the X/Y drive mechanisms and the Y-unit hoop holder, including its sensor arms. The parts drawings add construction detail: plate H shows the sewing head, while plate O shows the embroidery-unit drive and hoop-sensing components.

One parts list applies from product number 957144-xx. The companion catalog illustrates Version 1 and Version 2 thread-take-up components and their protective parts, providing distinctions to check before selecting replacements.

This package contains service and parts documentation. The service DVD and update software referenced in the manuals are separate items.

File Contents and PDF Navigation

• June 17, 2010 service-manual edition: 102 pages.
• September 10, 2009 service-manual edition: 95 pages.
• September 27, 2010 parts list 104 23 39-96: 22 pages; from product number 957144-xx.
• September 27, 2010 parts list 104 23 07-96: 22 pages; includes Version 1/Version 2 thread-take-up illustrations.

The 241-page total includes the original title pages and eight seller-added introductory pages, two in each PDF. The two service editions share substantial content.

Navigation: None of the four PDFs has embedded bookmarks. Text searches can locate technical headings and parts references; the introductory image pages are outside that search coverage.

Electrical illustrations: The circuit-board connector numbers and power-supply pin labels are readable in both service editions, including when enlarged. Electrical coverage is at the connector, test and assembly-replacement level.