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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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