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Brother LS-1717, Service Manual, Page: 9 / 20

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Brother LS-1717 Service Manual Download Page 9

- 5 -

Needle down centering

Standard

• 

When the needle position dial is set to “M” and the zigzag dial is set to “0”, the needle should be in the
center of the needle plate hole.

Adjustment

• 

Set the needle position selector to M 

 and the stitch width knob to 0 

.

• 

Loosen the setscrew 

 of the zigzag connecting rod 

.

• 

Loosen the fixation screw of the eccentric nut 

.

• 

Turn the eccentric nut 

 to make adjustment.

• 

Retighten the fixation screw of the eccentric nut 

.

• 

Retighten the setscrew 

.

Summary of Contents for LS-1717

Page 1: ...SERVICE MANUAL FOR LS 1717 LS 1817 LS 1717P LS 1717B LS 2020 LS 2020P LS 30 X 3 LS 2000 LS 2250PRW 3 2001 8 2010 ...

Page 2: ... based on the most up to date product specifications at the time of printing Some machine specifications may have been changed to improve the quality of the product Contact the manufacturer or your local sales representative for information on such changes Symbols used Move the part in the direction of the arrow Set the clearance as indicated Move the part to its highest or lowest position ...

Page 3: ...LIST of UPDATE RECORD 8 2010 Date Added Models Contents LS 2250PRW ...

Page 4: ...e way 3 Needle swing Parabola 4 Needle down centering 5 Needle position on zigzag to the needle plate 6 Loop lift 7 Height of the needle bar 8 Tension of the timing belt 9 Height of the feed dogs 10 Height of the presser bar 11 Stitch length for forward and backwards stitching 12 Upper tension control dial 13 Bobbin Winding 14 Adjustment of lower thread tension 15 ...

Page 5: ... Remove accessory table A Loosen and remove the screw then remove the face plate B Loosen and remove the screws then remove the front cover C Loosen and remove the screws lower the presser foot lifter then remove the rear cover D ...

Page 6: ...huttle hook point should be 0 02 to 0 1mm Adjustment Set the needle position selector to M and the stitch width knob to 0 Turn the balance wheel to set the needle and the shuttle hook to the correct timing position Turn the needle bar supporter stud slightly to either the right or left and adjust the clearance between the needle and the shuttle hook Note The center of the needle should align with ...

Page 7: ...river and the race way Standard The shuttle driver should rotate smoothly no play should be felt in the race way Adjustment 1 Loosen setscrews of the driver shaft gear 2 Adjust the clearance of the driver shaft 3 Retighten the setscrews ...

Page 8: ...the needle is in the descending stroke sideways end movement this at the left side turn the zig zag width dial from 5 0 and back the needle movement should be less than 0 1mm Adjustment Loosen the three zigzag base assembly screws Align the upper shaft gear and the zigzag cam gear Tighten the three zigzag base assembly screws ...

Page 9: ... in the center of the needle plate hole Adjustment Set the needle position selector to M and the stitch width knob to 0 Loosen the setscrew of the zigzag connecting rod Loosen the fixation screw of the eccentric nut Turn the eccentric nut to make adjustment Retighten the fixation screw of the eccentric nut Retighten the setscrew ...

Page 10: ...ered it should not be too close to either the left or right edge of the needle plate hole Adjustment Set the needle position selector to M and the stitch width knob to 5 Turn the balance wheel to lower the needle until it is just above the needle plate Loosen the locknut for the adjusting screw on the zigzag link Using a screwdriver turn the screw and adjust the needle movement range with respect ...

Page 11: ...e of the needle Adjustment 1 Set the stitch width knob to 5 then lower the needle to its lowest position at the left side of the needle plate 2 Loosen the setscrews on the drive connecting rod 3 Loosen the fixation screw of the eccentric nut 4 Turn the eccentric nut to make adjustment 5 Retighten the fixation screw of the eccentric nut 6 Retighten the setscrews ...

Page 12: ...le the shuttle hook point lower edge should be 0 8 1 2mm above the upper edge of the needle eye Adjustment 1 Set the stitch width konb to 5 then lower the needle to its lowest position at the right side of the needle plate 2 Loosen the setscrew of the needle bar 3 Move the needle bar up or down to make adjustment 4 Retighten the setscrew ...

Page 13: ...nsion of the timing belt Standard The belt should slacken approx 4 6mm under a 2N 200g load Adjustment 1 Loosen the setscrews on the motor holder 2 Move the motor to make adjustment 3 Retighten the setscrews ...

Page 14: ...m above the needle plate at the highest position Adjustment 1 Loosen the setscrew on the vertical feed arm 2 Loosen the fixation screw of the eccentric nut 3 Turn the eccentric nut to make adjustment 4 Retighten the fixation screw of the eccentric nut 5 Retighten the setscrew ...

Page 15: ...esser foot and the needle plate should be between 6 0 and 6 5mm Adjustment 1 Raise the presser foot 2 Loosen the screw on the presser bar guide bracket 3 Adjust the height of the presser bar 4 Tighten the screw Note Check that the presser foot and feed dogs are aligned ...

Page 16: ... There should be a difference of max 10 in the lengths of the forward and backward stitching Adjustment 1 Loosen the setscrew on the reverse sewing regulator shaft 2 Turn the reverse sewing regulator shaft left or right to make adjustment 3 Retighten the setscrew ...

Page 17: ... Adjustment 1 Remove the tension dial sheet and the stopring 2 Remove the tension dial 3 Turn the adjusting nut left or right to make adjustment 4 Remount the tension dial at zero position then the stopring and the tension dial sheet Note Cotton thread 50 should be used when adjusting the tension Do not include take up spring torque ...

Page 18: ...bobbin Adjustment 1 Loosen the set screw of the pretension slightly 2 Shift the pretension up or down until even winding is achieved 3 Retighten the set screw 4 Loosen the set screw of the bobbin presser 5 Adjust the bobbin presser until the correct amount of thread is wound 6 Retighten the set screw ...

Page 19: ...ndard Lower thread tension 0 3 0 35N 30 35g How to check the tension Pull cotton thread 50 with tension gauge slowly 1 Set cotton thread 50 in bobbin case and pull it with tension gauge 2 Adjust the adjustment screw to tension 0 3 0 35N 30 35g ...

Page 20: ...LS 1717 LS 1817 LS 1717P LS 1717B LS 2020 LS 2020P LS 30 X 3 LS 2000 LS 2250PRW T1010137 Printed in TAIWAN ...

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