78
33. Changing the synchronizer circuit board
Removal:
● Remove the mains lead from the mains socket and from the machine.
● Remove the detachable work support.
● Remove the folding cover.
● Unscrew and remove both torx screws of the housing insert.
● Remove the housing insert.
● Remove connection plug 12 from the circuit board on the front housing panel (fig. 96).
● Unscrew and remove fastening screw 123 on circuit board 124 using the torx offset screwdriver TX 15
(fig. 97).
● Unscrew and remove screw 17 on the housing (fig. 98).
● Raise the front housing panel slightly and pull the circuit board's power cable through cable tie 125.
● Remove the complete circuit board 124.
Fitting:
● Secure circuit board 124 to the housing with fastening screw 123, using the torx offset screwdriver
TX 15 (fig. 97).
Make sure that the circuit board is positioned as such, so that the cams of control cam 32 are positio
ned in the middle of the circuit board guides (fig. 99).
● Pull the power cable of circuit board 124 through cable tie 125.
● Secure the cable with cable tie 125 on the bar of the front housing panel (fig. 98).
● Tighten fastening screw 17.
● Mount connection plug 12 onto the circuit board on the front housing panel (fig. 96).
● Adjust the synchronizer in accordance with section 5.
● Attach the housing insert and secure with both torx screws.
● Attach the folding cover.
● After a running-in time of 10 - 15 min. check the adjustment of equal forward and reverse stitch length
according to section 21 of this service manual.
● Carry out an electrical safety test in accordance with VDE 0701 using testing appliance
Metrawatt 5013.
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