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36. Changing the upper stepping motor
Note:
The stepping motor for sideways needle bar movement must be replaced as a complete unit.
Removal:
• Remove machine’s mains plug.
• Remove detachable work support.
• Remove the housing covers as described in this manual.
• Remove retaining washer 140 from bolt 141 (fig. 86).
• Remove the bolt and carrying handle 142.
• Turn out the screws 143 of the SD motor unit (fig. 87a).
• Carefully place the SD motor unit aside.
• Remove circlip 107 on zigzag stepping motor 51 (fig. 87).
• Disengage connecting rod 108 and the toothed segment of zigzag stepping motor 51.
• Unscrew both fastening screws 50.
• Lift zigzag stepping motor 51 upwards out of the retainer in the direction of the arm shaft.
• Remove zigzag stepping motor to the front out of the housing.
Fitting:
• Install zigzag stepping motor 51 in the housing.
• Pull power cable downward.
• Insert and lightly tighten both fastening screws 50.
• Insert the pin of connecting rod 108 in the hole of the toothed segment.
• Attach circlip 107.
• Install the SD-motor unit and place the power cable at the bottom.
• Tighten the fastening screws 143 of the SD-motor unit (fig. 87a).
• Fit carrying handle 142 (fig. 86).
• Insert bolt 141 and attach retaining washer 140.
• Mount the housing covers according to this service manual.
Note:
Having exchanged the zigzag stepping motor for sideways needle movment, the adjustment
of the needle in the needle plate hole, section 10 must be repeated.
• Carry out a check of all functions.
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