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.
•
Raise both lugs 1 slightly and remove the facing panel in the direction of the arrow (fig. 77).
•
Remove connection plug 3 from the circuit board on the front housing panel (fig. 78).
•
Remove the connecting wire from the cable chanel.
•
Unscrew and remove fastening screw 126 on circuit board 36 using the torx offset screwdriver TX 15
(fig. 79).
•
Remove the complete circuit board 36.
Fitting:
•
Secure circuit board 36 to the housing with fastening screw 126, using the torx offset screwdriver
TX 15.
•
Make sure that the circuit board is positioned as such, so that the cams of control cam 35 are
positioned in the middle of the circuit board guides (fig. 80).
•
Insert the connecting wire of circuit board 36 through the cable chanel.
•
Mount connection plug 3 onto the circuit board on the front housing panel (fig. 78).
•
Mount the facing panel onto the front housing panel and make sure that both lugs 1 lock fully into
place (fig. 77).
•
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 22 of this service manual.
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