Remove the front cover (see page 11).
Move it so that the connectors can be pulled out.
Remove the screw A, then remove the buttonhole sensor B from the sensor plate C.
Pull out the connector of buttonhole sensor D from the k-board.
Pull out the cord of buttonhole sensor from the cord guide E and then remove the
buttonhole sensor B.
1. Attach the buttonhole sensor B with screw A. Pull the sensor forward so that it touches the
setting plate. Make sure it doesn't touch the buttonhole shield plate F, see illustration.
Pass the cord as illustrated and attach the front cover.
After replacing the buttonhole sensor, sew a few buttonholes. If something is abnormal,
adjust the "Buttonhole lever" (see page 22).