Description Viking Husqvarna 990 Prisma Sewing Machine Instruction Manual. Includes: * Bobbin winding. * Threading machine. * Thread tension. * Cassettes. * Accessories. * Programming of decorative stitches. * Fault-finding. * Control panel. * Lowering feed. * Machine maintenance. * Accessories. * Sewing hints. * Sewing on buttons. * Zigzag. * Programming decorative stitches. * Much more! 60 page instruction manual.