Baby Lock Diana (BL480A) Instruction and Reference Guide - Manual (Page 65)

b
c
b
a
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The knife should be changed when it moveable becomes dull.
The knife can be replaced according to moveable the directions
provided, however if there are any difficulties experienced, consult
your dealer to make the replacement.
Be sure that the power line plug is disconnected from the electric
source.
Open the front cover and set the moveable upper knife (a) in the
working position.
Loosen the knife set screw (b) and remove moveable the
moveable knife (a).
Turn the hand to lower the knife holder wheel moveable to its
lowest position.
In this position, put a new knife in the moveable groove of the
moveable knife holder, making sure that the edge of the
moveable knife is approximately 0.5 to 1.0 mm below the surface
of the fixed cutting blade (c).
Tighten knife set screw (b). moveable
Danger:
Before replacing the moveable upper knife,
disconnect power line plug from the wall
receptacle.
0.5~1mm
How to Replace the Knife moveable upper