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3.
NEEDLE DOWN POSITION ADJUSTMENT
STANDARD
Put the machine in test mode. When pattern , , or is selected to decide the left, center, or right needle
position, the needle should be positioned in the left or right part of the needle plate hole in the needle down position.
ADJUSTMENT
1.
Put the machine in test mode.
2.
Turn the balance wheel to move the needle to the needle down position.
3.
Loosen the screw securing the zigzag adjusting nut.
4.
Turn the balance wheel to move the needle to the left and right, and then turn the zigzag adjusting nut by using the
box wrench to set the needle in the center of the needle hole.
5.
Tighten the screw securing the zigzag adjusting nut.
6.
Turn the balance wheel and check the needle down position.
Summary of Contents for BL7800
Page 1: ...4 2001...
Page 4: ...2 1 MECHANICAL CHART...
Page 9: ...7 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE ARRANGEMENT 19...
Page 15: ...13...
Page 17: ...15...
Page 19: ...17...
Page 21: ...19 2 LEAD WIRE ARRANGEMENT...
Page 43: ...41 Main PC board...
Page 44: ...42 Power supply unit Power 120 Power 230...
Page 45: ...43 Operation board Other PC boards...
Page 46: ...BL7800 T1010141...