Janome FA4, Service Manual

Page 1: ...SERVICE MANUAL MODEL FA4 First Edition 15 November 2019 ...

Page 2: ... KNIFE 13 TO ADJUST THE CLEARANCE BETWEEN THE NEEDLES AND THE LOWER LOOPER NEEDLE GUARDS 14 to 16 TO ADJUST THE CLEARANCE BETWEEN THE NEEDLES AND THE FIXED NEEDLE GUARD 17 TO ADJUST THE POSITION OF THE CHAINING FINGER 18 TO ADJUST THE POSITION OF THE UPPER LOOPER 19 TO ADJUST THE TIMING OF THE NEEDLE AND THE LOWER LOOPER 20 TO ADJUST THE TIMING OF THE UPPER AND LOWER LOOPERS 21 TO ADJUST THE CLEAR...

Page 3: ...ce plate unit To attach 2 Fit the U groove of the face plate between the setscrew A and set plate put the ribs of face plate into the front cover unit back cover unit and tighten the setscrew Top cover unit Front cover unit Face plate unit U groove Back cover unit Set plate Setscrew A ...

Page 4: ...en setscrew A and remove the setscrew B 2 Remove the belt cover To attach 3 Put the ribs of belt cover into the front cover unit and back cover unit and tighten setscrews A and B Front cover unit Setscrew A Belt cover Back cover unit Setscrew B ...

Page 5: ...NGE THE TOP COVER UNIT To remove 1 Remove two setscrews A and remove the top cover unit To attach 2 Put the ribs in the front cover unit 3 Tighten two setscrews A Setscrew A Top cover unit Front cover unit Rib ...

Page 6: ...by turning the handwheel in counterclockwise 4 Loosen the setscrew B and remove the setscrews C and D and remove the front cover unit To attach 5 Attach the front cover unit and tighten the setscrews B C and D 6 Attach the top cover unit 7 Attach the looper cover unit and tighten the setscrews A Setscrew B Front cover unit Setscrew C Setscrew D Setscrew A Looper cover unit ...

Page 7: ...5 TO CHANGE THE FREE ARM COVER UNIT To remove 1 Remove setscrews A and remove the free arm cover unit To attach 2 Put the ribs of free arm cover into back cover 3 Tighten the setscrews A Setscrew A ...

Page 8: ... screws C and remove four base cushions D and washers 2 Remove the machine base unit To attach 3 Attach the machine base and the four base cushions D washers and tighten hinge screws C 4 Tighten setscrews A and B Washer Base cushion D Washer Hinge screw C Setscrew A Setscrew B ...

Page 9: ...as shown below 5 Attach the machine socket and tighten two setscrews C 6 Attach the machine socket unit on the motor fixing plate and tighten setscrews A B 7 Attach the belt cover Setscrew C Machine socket for 220 to 240V Setscrew A Setscrew C Setscrew B Setscrew A Motor fixing plate Setscrew B Machine socket for 120V LED lead cord LED lead cord Motor lead cord For 120V LED lead cord Motor lead co...

Page 10: ...ith your finger approximately 300 grams force The belt should bend 7 to 9 mm To adjust 1 Remove the belt cover see page 2 2 Loosen the 2 nuts A then tighten them a little Adjust the belt tension then tighten the nuts securely 3 Turn the handwheel for a few rotations and re check the belt tension 4 Attach the belt cover 7 to 9 mm Nut A ...

Page 11: ...front cover unit see pages 3 and 4 2 Turn the handwheel toward you with your hand and set the needle bar at the highest position 3 Loosen the setscrew A to adjust the height and tighten setscrew A after the adjustment is done 4 Turn the handwheel toward you one cycle and recheck the needle bar height 5 Attach the front cover unit looper cover unit and top cover unit O L G05 Setscrew A Needle bar N...

Page 12: ...op cover unit and front cover unit see pages 1 3 and 4 2 Raise the presser bar lifter and loosen the setscrew A Then adjust the presser bar height the side of presser foot should be parallel with the hole of needle plate 3 Tighten the setscrew A 4 Attach the front cover unit looper cover unit and top cover unit Presser bar lifter Setscrew A Top surface of needle plate 4 7 to 5 3 mm O L G05 5 mm To...

Page 13: ...it of the eccentric pin Adjust the main feed dog by turning the pin then tighten the setscrew A The standard setting of the feed dog height is when the slit on the eccentric pin is horizontal and eccentric position is at the rear side 6 Push the sub feed dog upward and adjust the distance between the surface of needle plate and bottom of presser foot then tighten the setscrews B and C 7 Check the ...

Page 14: ...ngth dial at 3 and the differential feed dial at 1 0 3 Raise the presser foot and move the tip of right needle to 3 mm above the needle plate in its downward motion by turning the handwheel 4 Lower the presser foot and loosen two setscrews A for feed cam Turn the feed cam in the direction B if the feed dog is lower than the surface of the needle plate Turn the feed cam in the direction C if the fe...

Page 15: ...the upper knife drive cam to the direction B when the upper knife timing is being delayed Turn the upper knife drive cam to the direction C when the upper knife timing is too soon 4 Tighten the two setscrews A firmly The cIearance between the upper knife drive cam and upper knife connecting rod shouId be 1 mm 5 Turn the handwheel toward you one cycle and recheck the needle and the upper knife timi...

Page 16: ...the looper cover unit top cover unit front cover unit presser foot needle plate and needles 2 Before loosening setscrew C attach the needle gauge 787 G02 to prevent change of needle bar height during the adjustment Attach two 11 needles on the needle clamp and loosen the setscrew C Adjust the two needIes to make the clearance between both needles and the front edge of the needle hole of the needle...

Page 17: ... needle guard and open a space between the front needle guard and the needle 4 Next loosen the hexagonal bolt B and slide the lower looper unit to the front or to the back to adjust the clearance between the right needle and the lower looper The clearance should be 0 mm to 0 05 mm Retighten the hexagonal bolt B Rear needle guard Lower looper Front needle guard Needle 11 0 to 0 05 mm Lower looper F...

Page 18: ... needle guard to adjust the cIearance between the needle and the lower looper The cIearance should be 0 mm to 0 05 mm 3 Attach 14 needle on the left needle position and turn the handwheel toward you to check the clearance between the left needle and looper Make sure the front needle guard is touching the needle slightly and the rear needle guard is not touching the needle 4 Check the timing betwee...

Page 19: ...f the fixed needle guard 3 Tighten two setscrews A 4 Attach the needle plate and set the needle plate setting knob to guide line S 5 Check the position of the chaining finger 6 Attach the free arm cover unit and the presser foot Needle plate setting knob should be set at S Chaining finger To be touched Fixed needle guard Fixed needle guard Needle 14 0 1 to 0 4 mm Tip of fixed needle guard Guide li...

Page 20: ... Set the needle plate setting knob to guide line S on needle plate 3 Loosen two setscrews A and move chaining finger unit to correct position 4 Tighten two setscrews A 5 Set the needle plate setting knob to guide line S and R and check the position of chaining finger 6 Attach the free arm cover unit and the presser foot Chaining finger To be touched Fixed needle guard Should be same level Setscrew...

Page 21: ...most position 5 Remove the spreader setscrew B and spreader holding plate C 6 Loosen the hexagonal socket screw D and adjust the distance between the center of needle and center of upper looper eye is 5 mm 4 8 to 5 2 mm as shown in Figure 2 7 Tighten the hexagonal socket screw D 8 Set the spreader holding plate C to the upper looper shaft and tighten the spreader setscrew B 9 Check the upper and l...

Page 22: ...e gauge touches the needle bar lower bushing as shown in Figure 2 6 In this condition loosen the hexagonal bolt C in figure 3 just enough to move the lower looper base Adjust the lower looper position in order to meet the tip of lower looper with left side of needle 11 as shown in Figure 4 Tighten hexagonal bolt C 7 Remove the gauge 787 G02 Check the clearance between the needle and lower looper C...

Page 23: ...Remove the machine base 3 Loosen two set screws and adjust the timing by turning the upper looper drive cam in the direction of A if the timing of upper looper is advanced as shown in Figure 3 B if the timing of upper looper is delayed as shown in Figure 4 The allowance is 0 2 to 1 2 mm from the left edge of lower looper eye as shown in Figure 1 4 Tighten two setscrews 5 Check the clearance betwee...

Page 24: ...nd to bring the loopers as shown in Figure 2 3 Loosen the setscrew B and adjust the clearance between the loopers by moving the upper looper to the back or front as shown in Figure 3 4 Tighten the setscrew B firmly 5 Check the clearance between the upper looper and needle 6 Set the spreader holding plate and tighten the spreader setscrew A Upper looper Lower looper 0 to 0 1 mm Figure 1 Figure 2 Up...

Page 25: ...ding plate 2 Turn the handwheel toward you with your hand to bring the needle just behind the upper looper in downward travel 3 Loosen the setscrew B and adjust the clearance between the both needles and upper looper 4 Tighten the setscrew B 5 Check the clearance between the loopers 6 Set the spreader holding plate and tighten the spreader setscrew A Upper looper Needle Clearance Figure 1 Spreader...

Page 26: ... B and turn the pin C slowly then adjust the lower knife position Tighten setscrew B Figure 2 to 4 4 Turn the handwheel toward you to bring upper knife to its lowest position 5 Loosen the hexagonal bolt D and adjust the position of the upper knife Figure 1 6 Tighten hexagonal bolt D firmly turn the handwheel toward you to check the upper knife matching position with the lower knife Upper knife Low...

Page 27: ...en setscrew A and swing the looper thread guide up or down to match the bottom edge of both looper thread guide and upper looper drive arm as shown in Figure 1 Tighten the setscrew A to secure the position Looper thread guide Upper looper drive arm Setscrew A Alignment Figure 1 ...

Page 28: ...h length dial at 3 and the differential feed dial at 1 0 2 Remove the front cover unit 3 lf the actual stitch length is longer than 3 0 mm turn the adjusting screw in the direction A If the actual stitch length is shorter than 2 8 mm turn the adjusting screw in the direction B 4 Attach the front cover unit Looper thread guide Direction B Direction A Stich length dial 3 Diffrential feed dial 1 0 ...

Page 29: ...force Tension dial set to 9 55 grams force or more Lower looper Tension dial set to 3 20 to 30 grams force Tension dial set to 9 120 grams force or more To adjust 1 Remove the top cover unit 2 Adjust each thread tension with the adjusting plate A If the thread tension is at stronger level shift the adjusting plate in the direction B If the thread tension is at weaker level shift the adjusting plat...