Husqvarna Viking Designer Diamond Royale User Manual page 134

Bobbin thread breaks
The seam has uneven stitches
The machine does not feed or feeds
irregularly
Thread loops are forming on the underside
of the embroidery design
The embroidery design is distorted
Is the inner embroidery hoop completely inserted
The embroidery design has puckered
The machine will not embroider
Have your sewing machine serviced regularly by your local authorized retailer!
Non-original parts and accessories
10:4
10 Maintenance
Check the bobbin thread.
Change the needle plate.
Clean lint from bobbin area and use only the original bobbins
Wind a new bobbin.
Check needle Thread Tension and the threading.
Change the thread.
Check bobbin winding.
Insert a proper needle correctly as described in chapter 2.
Check how the machine is threaded. If needed rethread the
machine.
If using the R-foot, increase the presser foot height in Machine
The fabric must be tightly hooped.
the outer hoop.
Clear area around the embroidery unit.
type.
Make sure that the embroidery unit is properly attached into the
socket.