88
38. Changing the buttonhole sensor
Note:
The buttonhole sensor is only exchanged complete.
Removal:
● Remove the machine's mains lead.
● Remove the needle and presser foot.
● Remove the folding cover.
● Unscrew and remove both torx screws from the housing insert.
● Remove the housing insert.
● Raise both lugs 1 slightly and remove the facing panel of the front housing panel.
● Place the machine on its back.
● Unscrew and remove the three screws in the base plate.
● Tilt the base plate to the front and remove both connection plugs 3 and 4 from the circuit board
(fig. 108).
● Unscrew and remove both screws 5 from the free-arm cover (fig. 109).
● Bring the feed-dog lowering mechanism into its normal working position.
● Disengage both feed regulators 6 using a small screwdriver (fig. 109).
● Remove the cable clip.
● Remove connection plug 16 from the circuit board of the front housing panel and pull the cable
downward (fig. 110).
● Remove the free-arm cover from the housing to the left.
● Remove connection plug 13 from the circuit board of the front housing panel and pull the cable
downward (fig. 110).
● Remove cable guide 20 (fig. 109).
● Dismantle buttonhole sensor 138 complete with the spring.
Fitting:
● Install buttonhole sensor 138 complete with the spring.
● Insert the cable with cable guide 20 in the housing.
● Turn the machine upside down.
● Place the cable, using a spring hook, between the motor and the housing wall.
● Mount connection plug 13 on the circuit board of the front housing panel (fig. 110).
● Put the machine in its working position.
● Mount the free-arm cover carefully and secure with both fastening screws 5.
● Bring the feed-dog lowering mechanism into its normal working position.
● Engage both feed regulators 6 (fig. 109).
● Turn the machine upside down.
● Place the cable, using a spring hook, between the motor and the housing.
● Mount connection plug 16 on the circuit board of the front housing panel (fig. 109).
● Attach the cable clip.
● Mount both connection plugs 3 and 4 on the circuit board of the base plate (fig. 108).
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