Bernina 790 PRO Manual page 180

Care and Maintenance
Electronically Driven Components
Risk of injury near the needle and the hook.
> Switch the machine off and disconnect it from the power supply system.
> Remove the bobbin case.
> Push the release bracket to the left.
> Flap down the fastening bracket along with the black hook race cover.
> Remove the hook.
> Clean the hook race area with a brush and a soft cloth. Never use any sharp instruments.
> Add one drop of BERNINA oil down into the hook race.
> Add one drop of oil into each of the two oil depots so that the felts are damp, and make sure that the
> Hold the hook at the pin in the center with two fingers.
> Guide the hook with the lower edge diagonally from the top to the bottom behind the hook race cover.
> Position the hook so that the two lugs on the hook driver fit into the corresponding openings on the
> Insert the hook.
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red-marked surface of the hook sleeve remains free of oil.
hook, and the colored marking on the hook driver is visible in the hole of the hook.
– The hook is magnetic and therefore fastened to the correct position.