Brother International LK3-B438E MKII Instruction Manual - English - Page 36
STANDARD ADJUSTMENTS, 10-1 . Adjusting the needle bar height
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10 . STANDARD ADJUSTMENTS 10 . STANDARD ADJUSTMENTS CAUTION Maintenance and inspection of the sewing machine should only be carried out by a qualified technician. Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system. Turn off the power switch and disconnect the power cord from the wall outlet at the following times, otherwise the machine may operate if the foot switch is depressed by mistake, which could result in injury. · When carring out inspection, adjustment and maintenance · When replacing consumable parts such as the rotary hook and knife Hold the machine head with both hands when tilting it back or returning it to its original position. Furthermore, after tilting back the machine head, do not push the face plate side or the pulley side from above, as this could cause the machine head to topple over, which may result in personal injury or damage to the machine. If the power switch needs to be left on when carrying out some adjustment, be extremely careful to observe all safety precautions. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. 10-1 . Adjusting the needle bar height q A TQ × 1 w e Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug w, loosen the set screw e and then move the needle bar up or down to adjust so that the highest reference line (reference line A) is aligned with the lower edge of the needle bar bush q. 10-2 . Adjusting the needle bar lift amount q t w t e r B y TQ × 1 t e Adjust the needle bar lift amount as described below so that the tip of the rotary hook is aligned with the center of the needle when the machine pulley is turned to raise the needle bar from its lowest position until the second reference line from the top of the needle (reference line B) is aligned with the lower edge of the needle bar bush q. 1. Open the support w in the direction of the arrow, and remove the felt support e. 2. Loosen the screw r , and move the driver to adjust so that the tip of the rotary hook is aligned with the needle center line. * When returning the felt support e, place it as shown in the illustration so as not to clamp the felt t, and then gently press the felt t and the wick y until they are at the same height as the rotary hook race. * Return the support w to its original position. LK3-B438E Mark II 30