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Janome 3128 Service Manual - Service Access

Other manuals for 3128: Instruction Book

Summary of 3128

  • Page 1

    Service manual model 3128.

  • Page 2: Contents

    Contents what to do when ......................................................................................1-3 service access face cover .................................................................................... 4 rear cover ................................................................

  • Page 3: What to Do When

    Model 3128 1 condition cause how to fix reference 1. Skipping 1. Needle is not inserted insert the needle properly. Properly. Stitches 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded. Rethread. 4. Needle or thread are use the recommended sewing inappropriate for fabric needle a...

  • Page 4

    Model 3128 2 condition cause how to fix reference 3. Breaking 1. Initial sewing speed is start with medium speed. Upper too fast. Thread 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4. Upper thread tension is adjust upper thread tensi...

  • Page 5

    Model 3128 3 condition cause how to fix reference 5. Needle 1. Needle is hitting the needle see mechanical adjustment p.11 breaks plate. “needle drop.” 2. Needle is bent or worn. Change the needle. 3. Needle is hitting the hook see mechanical adjustment p.12, 13 race. “clearance between needle and h...

  • Page 6: Service Access

    Model 3128 4 service access to remove 1. Remove the setscrew "a". 2. Take the face cover "b" off. Note: when removing the face cover, pull it up and unhook from the hook "c". To attach 3. Follow the above procedure in reverse. C a b face cover.

  • Page 7: Service Access

    Model 3128 5 service access rear cover to remove 1. Remove the face cover (see page 4). 2. Remove the setscrews "a", "b", "c", "d", "e" and rubber cushion "f" (2 pcs.), and then remove the rear cover. To attach 3. Follow the above procedure in reverse. A rear cover c f d f b e.

  • Page 8: Service Access

    Model 3128 6 service access front cover to remove 1. Remove the face cover and rear cover (see pages 4, 5.) 2. Pull out the pattern selector dial. 3. Loosen the setscrews "a", "b" and remove the setscrews "c", "d" and the rubber cushion "e", then remove the front cover. To attach 4. Follow the above...

  • Page 9: Mechanical Adjustment

    Model 3128 7 a b d c top tension to check: the standard upper thread tension should be 65 - 95g when pulling the thread (cotton thread #50) in the direction of "a" with setting the tension dial at "3". (make sure the foot should be lowered.) if the tension is out of the standard range, adjust it as ...

  • Page 10: Mechanical Adjustment

    Model 3128 8 bobbin tension to check: set the bobbin in the bobbin case and pass the thread (cotton #50) through the tension spring. The bobbin thread tension should be 45 - 55g when pulling the thread in the direction of "a". If the tension is out of the range, adjust it as follows: adjustment proc...

  • Page 11: Mechanical Adjustment

    Model 3128 9 presser bar height and alignment to check: 1. Raise the presser foot lever. 2. The distance between the presser foot "c" and the needle plate "d" should be 6.0mm (0.24"). Adjustment procedure: 1. Remove the face cover (see page 4). 2. Remove the lamp "a" off. 3. Raise the presser foot l...

  • Page 12: Mechanical Adjustment

    Model 3128 10 needle swing to check: adjust the needle swing according to the following procedure, if the needle bar starts moving sideways while the needle is in the fabric at sewing the zigzag pattern (with maximum zigzag width). Adjustment procedure: 1. Set the pattern selector dial with maximum ...

  • Page 13: Mechanical Adjustment

    Model 3128 11 needle drop to check: when the needle swings in maximum zigzag width, the distance between the both ends of needle hole in the needle plate and the needle drop positions should be equal. If not, make an adjustment as follows: adjustment procedure: 1. Remove the face cover (see page 4)....

  • Page 14: Mechanical Adjustment

    Model 3128 12 mechanical adjustment clearance between needle and needle plate is 0.15 mm or more. Figure "d" -0.05 - 0.10 mm projections (2 spots) base plate setscrew "a" (2 pcs.) direction "b" needle bar supporter adjusting plate clearance between needle and hook (no.1) to check: the clearance betw...

  • Page 15: Mechanical Adjustment

    Model 3128 13 clearance between needle and hook (no.2) to check: use this adjustment method no.2 if the clearance cannot be adjusted with the method no.1. The clearance between needle and shuttle hook should be -0.05 - 0.10 mm. Adjustment procedure: 1. Set the pattern selector dial at maximum zigzag...

  • Page 16: Mechanical Adjustment

    Model 3128 14 feed dog height machine setting 1. Stitch selector: " " 2. Needle bar: at its highest position. To check: 1. Lower the presser foot. 2. Turn the handwheel toward you until the needle bar comes to its highest position. The feed dog should be above the needle in the range of 0.75 - 0.90 ...

  • Page 17: Mechanical Adjustment

    Model 3128 15 needle bar height machine setting 1. Stitch selector: " ". To check: when the tip of shuttle hook meets the left side of the needle in ascending travel of the needle from its left and lowest position, the distance between the top of the needle eye and the tip of the shuttle hook should...

  • Page 18: Mechanical Adjustment

    Model 3128 16 needle timing to shuttle machine setting 1. Stitch selector: " ". To check: the height of the needle point from its lowest point of travel should be in the range of 1.45 - 1.95 mm when the tip of the shuttle hook just meets the left side of the needle at the left needle position. Adjus...

  • Page 19: Mechanical Adjustment

    Model 3128 17 buttonhole feed balance to check: when sewing buttonhole, the stitches on each side of buttonhole stitch density should be the same. The range of 9 - 11 stitches in the right side row "backward feeding" against 10 stitches in the left side row "forward feeding" is considered acceptable...

  • Page 20: Mechanical Adjustment

    Model 3128 18 mechanical adjustment adjusting screw a left side line tack width right side line tack width adjustment of right hand line tack width and cam follower release amount * the width of the left and right side line tack of buttonhole should be equal. If there is large difference between lef...

  • Page 21: Mechanical Adjustment

    Model 3128 19 motor belt tension to check: 1. Too tight or too loose motor belt tension may create belt noise and also too tight motor belt tension can cause the machine to run slow and will overload the motor. Too loose motor belt tension may cause jumping of the belt teeth on the motor pulley. 2. ...

  • Page 22: Wiring

    Model 3128 20 wiring for machine socket unit wiring m : motor l : lamp p : power switch m l p.

  • Page 23: Oiling

    Model 3128 21 factory lubricated parts will provide years of household sewing without routine oiling, but check rot possible lubrication needs whenever servicing machines. Oil use good quality sewing machine oil at the points "a", "b", "c", "d", "e" indicated by black arrows. Grease the white grease...