Brother International BM-917B Instruction Manual - English - Page 24

12. STANDARD ADJUSTMENTS 12. 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. The machine may operate if the pedal is pressed by mistake, which could result in injury. ! When carrying out inspection, adjustment and maintenance ! When replacing consumable parts such as the loopers and knife * The motor will keep turning even after the power is switched off as a result of the motor's inertia. Wait until the motor stops fully before starting work. When turning the machine pulley by hand, turn the pulley until the needle is at the final position after one cycle. If the needle is at a point midway through the cycle when the power is turned on, the machine will immediately start operating, which could result in injury. 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. 12-1. Adjusting the needle bar height Adjust so that reference line (a) on the needle bar (1) is aligned with the bottom edge of needle bar bush D (2) when the needle bar (1) is at its lowest position. * If using a TQx7 needle, adjust by aligning reference line (c). 1. Turn the machine pulley to set the needle bar (1) to its lowest position. 2. Loosen the screw of the needle bar clamp (3) by inserting a screwdriver through the hole in the face plate, and then move the needle bar (1) up or down to adjust the height. 3. Tighten the screw of the needle bar clamp (3). 2005M 12-2. Adjusting the needle and looper timing Adjust so that the tip of the looper (3) is aligned with the center of the needle when the needle bar (1) rises from its lowest position until reference line (b) of the needle bar (1) is aligned with the bottom edge of needle bar bush D (2). * If using a TQx7 needle, adjust by aligning reference line (d). 1. Loosen the two set screws (4), and then turn the looper setting shaft (5) to adjust the timing. 2. Tighten the set screws (4). 2006M BM-917B, 917C 18