Changing The Base Circuit Board - Pfaff expression 2014 Service Manual

29. Changing the base circuit board

Note:
The base circuit board is only exchanged as a complete unit.
Removal:
Remove the mains lead from the mains socket and from the machine.
Remove the detachable work support.
Unscrew and remove the three fastening screws on the base plate.
Tilt the base plate to the front.
Remove the connection plug of twelve-wire flat cable 3 as well as the connection plug of motor cable 4
from the circuit board (fig. 84).
Fitting:
Set the new base plate complete against the machine.
Mount both connection plugs 3 and 4 on the circuit board.
Fold the base plate against the machine and secure it with the three screws.
After a running-in time of 10 - 15 min. check the adjustment of equal forward and reverse stitch length
in accordance with section 21 of the service manual.
Carry out an electrical safety test according to VDE 0701 using testing appliance Metrawatt 5013.
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