Changing The Top Stepping Motor - Pfaff expression 2014 Service Manual

36. Changing the top stepping motor

Note:
The stepping motor for sideways needle bar movement is only exchanged complete.
Removal:
Remove mains lead.
Remove detachable work support.
Remove the housing according to the service manual.
Remove circlip 97 on zigzag stepping motor 46 (fig. 105).
Disengage connecting rod 99 and the tooth segment of zigzag stepping motor 46.
Unscrew and remove both fastening screws 45.
Lift zigzag stepping motor 46 upwards out of the retainer in the direction of the arm shaft.
Remove the zigzag stepping motor to the front, out of the housing.
Fitting:
Install zigzag stepping motor 46 in the housing.
Pull power cable downward.
Insert and tighten both fastening screws 45 (fig. 106).
Insert the pin of connecting rod 99 in the hole of the tooth segment.
Attach circlip 97.
Mount the housing according to the service manual.
Note:
Having exchanged the zigzag stepping motor for sideways needle movement, adjustment of the needle
in the needle hole, section 9 must be repeated.
Carry out a check of all functions.
Carry out an electrical safety test in accordance with VDE 0701 using testing appliance Metra-
watt 5013.
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