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Janome AirThread 2000D, Service Manual

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Janome AirThread 2000D Service Manual Download Page 33

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Mechanical Adjustment

MODEL: AirThread 2000D

To adjust the thread tensions

Use a standard thread #50. Do not pass the thread through the top cover thread guide.
Standard tension:
Left needle:  Tension dial set to 3, 30-40 gf, Tension dial set to 9, 80 gf or more
Right needle:  Tension dial set to 3, 15-19 gf, Tension dial set to 9, 50 gf or more
Upper looper: Tension dial set to 3, 9-13 gf, Tension dial set to 9, 30 gf or more
Lower looper: Tension dial set to 3, 18-22 gf, Tension dial set to 9, 55 gf or more

To adjust:
1.  Use a standard thread to check the tension.
2.  If the thread tension is not correct, turn the tension 

dial so that the thread tension becomes the value 
represented by “3” of the dial (ignore the real number 
on the dial). 

3.  Remove the top cover.
4.  Raise and hold the adjusting plate with a screwdriver. 

Turn the dial to match the position of “3” with the notch 
(position of the setting mark on the top cover).

5.  Check the thread tension again. Repeat the procedure 

of steps 2 and 4 until the thread tension becomes 
correct.

6.  Attach the top cover.

Thread tension dial

Notch of 
the thread 
tension plate

Thread

Adjusting 
plate

To pull the thread to this direction

Holding the adjusting plate 
raised with a screwdriver,
turn the dial.

Turn the dial to the 
direction (A) 
to loosen 
the tension

Turn the dial to the 
direction (B) 
to tighten

Thread tension 
plate

Notch of 
the thread 
tension plate

Summary of Contents for AirThread 2000D

Page 1: ...SERVICE MANUAL MODEL AirThread 2000D Second Edition xx May 2018...

Page 2: ...e clearance of the needle and needle guard rear 23 To adjust the timing of the needle and the lower looper 24 To replace the upper looper and to adjust the position of the tip of the upper looper 25 T...

Page 3: ...imum stitch length Refer to page 15 E Overlap of the upper knife and the lower knife Refer to page 17 F Leftmost position of the upper looper Refer to page 26 G Timing of the upper looper and the lowe...

Page 4: ...Top cover To remove 1 Remove the setscrews 2 pcs on the rear side of the top cover 2 Release the hooks of the top cover from the front cover 3 Remove the top cover To attach Follow the above procedur...

Page 5: ...AirThread 2000D Replacing External Parts Face plate 1 To remove 1 Remove the top cover 2 Remove the cap 3 Remove the setscrew 4 Slightly lower the needle threader lever and remove the face plate Cap S...

Page 6: ...attach 1 Attach the face plate in place Hold the face plate with your finger Rib 2 Pull the front cover lightly and place the ribs into the inside of the front cover 3 Tighten the setscrew and attach...

Page 7: ...ve the top cover 2 Open the looper cover 3 Remove the cap 4 Remove the setscrew A 5 Loosen the setscrew B on the base 6 Remove the belt cover 7 Close the looper cover To attach Follow the above proced...

Page 8: ...emove the hinge screw 3 pcs and remove the rubber soles unit 3 Remove the setscrew 4 Remove the base plate Hinge screw Rubber sole unit Rubber sole unit Hinge screw Rubber sole unit Setscrew Hinge scr...

Page 9: ...Setscrew To attach 1 Set the looper threader switch lever to the THREADING right side Make sure that the looper cover position detecting arm comes in front of the looper threader switch lever connect...

Page 10: ...in reverse Make sure that set the front cover into the catch of the looper cover position detecting arm Setscrew A Setscrew B Looper cover position detecting arm Setscrew C Setscrew C Setscrew A Uppe...

Page 11: ...lly tighten the setscrews 2 pcs 2 Open and close the side cover adjusting the position vertically and horizontally Make sure that there is no gap with the needle plate the rear cover or the looper cov...

Page 12: ...belt cover and the side cover 2 Remove the setscrews A 2 pcs on the carrying handle 3 Remove the setscrews B 2 cps from the base 4 Loosen the setscrew C 5 Remove the rear cover To attach Follow the a...

Page 13: ...2 mm through the hole 3 Loosen the setscrew with the hexagonal wrench 2 mm and adjust the needle bar height moving the needle bar up or down Be careful not to turn the needle bar while moving it Tight...

Page 14: ...se the presser foot again Be sure that the distance between the presser foot and the needle plate is 5 2 to 5 8 mm 4 Turn the handwheel toward you Make sure that the clearance between the needle and t...

Page 15: ...djust 1 Remove the top cover the belt cover the face plate and the rear cover 2 Loosen the setscrew 3 If the feed dog is lower than the needle plate turn the adjusting screw clockwise If the feed dog...

Page 16: ...of the needle plate 5 Measure the gap a between the main feed dog and the sub feed dog 6 Turn the handwheel toward you to lower the main feed dog and the sub feed dog until the upper surface of the fe...

Page 17: ...the distance is not 30 to 32 mm loosen the setscrew and adjust as follows If the stitch length is longer than 32 mm turn the stitch length adjusting pin to the direction where the differential feed a...

Page 18: ...etscrews 2 pcs Turn the upper knife drive cam to adjust the timing Tighten the setscrews 2 pcs When the upper knife timing is late Turn the upper knife drive cam to the direction A When the upper knif...

Page 19: ...pper knife and partially tighten the bolt 2 Set the upper knife to the lowest position by turning the handwheel toward you 3 Loosen the bolt Adjust the position of the upper knife so that the front lo...

Page 20: ...the lower looper connecting pipe 4 Partially tighten the setscrews D 2 pcs to fix the lower looper connecting pipe arm Aligning the the screw hole of the lower looper with the screw hole of the lower...

Page 21: ...nk shaft as shown 5 The tip of the lower looper should match with the guide line of the gauge 65 7 mm If not adjust the lower looper height position see next page Side cover Upper knife release knob P...

Page 22: ...10 Tighten the setscrew C 11 Check the clearance between the needle and the lower looper the timing of the needle and the lower looper the timing of the upper looper and the lower looper and the clea...

Page 23: ...heel toward you until the tip of the lower looper comes from the left to the rear groove of the right needle 8 Check if the clearance between the rear groove of the right needle and the tip of the low...

Page 24: ...clearance between the upper looper and the lower looper Refer to pages 24 27 and 28 To adjust the clearance of the needle and needle guard front 1 Turn the handwheel toward you until the tip of the l...

Page 25: ...the handwheel toward you until the tip of the lower looper comes from the left to the rear groove of the needle with the HAx1 SP 14 needle slightly deflected by the needle guard front Check the cleara...

Page 26: ...fo the needle bar may be damaged 10 Remove the timing gauge Turn the handwheel toward you to raise the needle bar until the needle bar gauge touches the needle bar lower bushing 11 Loosen the bolt sli...

Page 27: ...e upper looper to the leftmost position by turning the handwheel toward you 2 Loosen the setscrew When the upper looper moves down from the leftmost position place the upper looper tip gauge on the up...

Page 28: ...tion of the tip of the upper looper If adjustment is required adjust the position as follows To adjust 1 Loosen the setscrews 2 pcs Adjust the position of the tip of the upper looper by moving the upp...

Page 29: ...n in the Fig 1 when the lower looper moves from left to right and the upper looper moves upward Turn the spreader to the right 4 Place the plate gauge on the lower looper and check the position of the...

Page 30: ...n the looper cover 2 While pressing the upper knife release knob turn it clockwise by half a rotation to deactivate the upper knife 3 Turning the handwheel toward you so that the upper looper intersec...

Page 31: ...looper and the lower looper and the clearance between the upper looper and the lower looper and the clearance between the needle and the upper looper Refer to pages 24 to 29 1 Open the looper cover 2...

Page 32: ...ase knob turn it clockwise by half a rotation to deactivate the upper knife 4 Set the chaining finger switch knob to S 5 Loosen the setscrews 2 pcs Adjust the position of the chaining finger by moving...

Page 33: ...rrect turn the tension dial so that the thread tension becomes the value represented by 3 of the dial ignore the real number on the dial 3 Remove the top cover 4 Raise and hold the adjusting plate wit...

Page 34: ...belt cover 2 Check the tension of the lower looper pre tension with the standard thread 3 If the thread tension is not correct adjust the tension by inserting a screwdriver in the slit of the thread t...

Page 35: ...r set plate horizontally so that the hook comes through eye of the left needle or the right needle 6 Loosen the setscrews C 2 pcs Adjust the position of the threader shaft guide plate by moving it to...

Page 36: ...oper threader air adjustment of the looper threader air is preferable to adjustment of the looper take up lever To check 1 Open the looper cover 2 Turn the handwheel toward you to set the upper looper...

Page 37: ...not be coaxial or straight 6 Remove the top cover the face plate the belt cover the base plate the looper cover and the front cover Open the side cover To adjust Set the looper threader switch lever t...

Page 38: ...fective Replace the looper threader device air unit 7 4To replace the looper threader device air unit NOTE Set the looper threader switch lever is set to SEWING the slide pipe is disengaged from the l...

Page 39: ...eck 1 Place the machine with the rear cover down 2 Insert a screwdriver into the slit of the adjusting screw of the real left rubber sole Tighten the screw and loosen the screw by a quarter rotation T...

Page 40: ...moving and attaching each part refer to the instructions in the related section To attach 1 Connect the cord of the replaced part to the machine socket unit 2 Tight the setscrews B 2 pcs to fix the ma...

Page 41: ...er the rear cover and the machine socket unit 2 Remove the setscrews A 2 pcs 3 Remove the motor 4 Remove the setscrews B 2 pcs 5 Remove the machine socket cover 6 Remove the nuts 7 Remove the motor te...

Page 42: ...belt tension is correct Standard tension The correct motor belt tension is when the deflection of motor belt is about 5 6 mm while pushing the motor belt by finger with a 300 gf 7 Loosen the setscrew...

Page 43: ...nd remove the LED cord from the rear cord guide To attach 1 Insert the LED in the LED holder and close the hook 2 Insert the LED cord in the rear cord guide 3 Insert the LED connector in the machine s...

Page 44: ...tach 1 Insert the terminals into the relay cable RF unit and the relay cable FF unit 2 Tighten the setscrew B to fix the micro switch to the switch set plate 1 3 Partially tighten the setscrew A to fi...

Page 45: ...the terminals into the relay cable RF unit and the relay cable FF unit 2 Tighten the setscrew B to fix the micro switch to the switch set plate 2 3 Partially tighten the setscrew A to fix the switch...

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