Adjusting The Sewing Machine (Standard Adjustments); Points To Note When Making Adjustments - Brother Z-8550B Instruction Manual

9
Adjusting the sewing machine
(Standard adjustments)

Points to note when making adjustments

• Secure the table so that it will not move when tilting back the machine head. If the table moves, it
may crush your feet or cause other injuries.
• Use both hands to hold the machine head when tilting it back or returning it to its original position. If
only one hand is used, the weight of the machine head may cause your hand to slip, and your hand
may get caught.
• Turn off the power switch and disconnect the power cord plug before carrying out inspection,
adjustment or repairs, or when replacing consumable parts such as the rotary hook or knives. The
machine may operate if the treadle is depressed by mistake, 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.
• Do not touch the face plate knives when opening the thread take-up guard cover. Otherwise it may
result in injury.
• When removing the needle plate, auxiliary needle plate and knife unit, use a screwdriver that
matches the size of the screw heads. If a screwdriver that does not match the size of the screw
heads is used, it may damage the screw heads and result in injury to the operator or damage to the
articles being sewn.
• 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.
• 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.
• Always be sure to turn off the power switch and then wait one minute before opening the motor
cover. If you touch the surface of the motor, it may cause burns.
Related Information
• Adjusting the position of the hand switch on page 104
• Adjusting the safety switch position on page 105
• Adjusting the thread tension spring on page 106
• Adjusting the height of the presser foot on page 107
• Adjusting the height of the feed dog on page 108
• Adjusting the feed dog angle on page 109
• Adjusting the forward/back position of the feed dog on page 110
• Adjusting the height of the needle bar on page 111
• Adjusting the needle and rotary hook timing on page 112
• Adjusting the position of the bobbin case holder position bracket on page 114
• Adjusting the rotary hook lubrication amount on page 115
• Adjusting the presser foot floating amount (minute lifting amount) on page 117
• Adjusting the treadle operation on page 118
• Adjusting the thread trimming cam position on page 119
• Adjusting the tension of the lower thread presser spring on page 121
• Adjusting the upper thread trailing length after thread trimming on page 122
• Adjusting the thread wiper on page 124
CAUTION
103