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1

 TROUBLESHOOTING

 

PROBLEM 

 CAUSE   

REMEDY 

        REFERENCE 

 
  1.  Skipping   

1.  Needle is not inserted  

Insert the needle properly.

  stitches 

 

 properly.

     

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 being 

needle and thread.

   

 sewn.

     

5.  Sewing on stretch fabric 

Use A #11 blue tip needle.

    

     

6.  Inappropriate needle bar  

See mechanical adjustment  

P. 16

   

 height 

 

Needle bar height.”

   

  

     

7.  Inappropriate needle to hook 

See mechanical adjustment  

P. 17

     

   timing 

“Needle timing to shuttle.”  

   

  

     

8.  Inappropriate needle to hook  

See mechanical adjustment  

P. 13, 14 

      

  clearance  

“Clearance between needle and

   

  

hook.”

   

  

  2.  Fabric not  

1.  Incorrect feed dog height 

See mechanical adjustment  

P. 15

    moving 

   

“Feed dog height.”

   

  

     

2.  Thread on bottom side of  

Make sure to bring both needle  

     

  fabric is jammed up.   

and bobbin thread under the foot 

     

   

when starting sewing.

     

    

     

3.  Feed dog teeth are worn. 

Change the feed dog. 

    

Содержание 13512

Страница 1: ...SERVICE MANUAL MODEL 13512 14412 15312...

Страница 2: ...AND ALIGNMENT 10 NEEDLE SWING 11 NEEDLE DROP 12 CLEARANCE BETWEEN NEEDLE AND HOOK ADJUSTMENT METHOD NO 1 13 CLEARANCE BETWEEN NEEDLE AND HOOK ADJUSTMENT METHOD NO 2 14 FEED DOG HEIGHT 15 NEEDLE BAR H...

Страница 3: ...6 Inappropriate needle bar See mechanical adjustment P 16 height Needle bar height 7 Inappropriate needle to hook See mechanical adjustment P 17 timing Needle timing to shuttle 8 Inappropriate needle...

Страница 4: ...ad 2 Too much thread is around on Adjust the position of stopper the bobbin 3 Lint is stuck inside the hook Clean the hook race race 4 Thread quality is too low Change to a high quality sewing thread...

Страница 5: ...Motor belt tension 4 Upper shaft gear is loose Eliminate the looseness 5 Not enough oil Oil all moving parts 7 Deformation of 1 Inappropriate zigzag See mechanical adjustment P 11 pattern synchroniza...

Страница 6: ...4 A Face cover SERVICE ACCESS 1 FACE COVER To remove 1 Remove the face cover by removing the setscrew A To attach 2 Mount the face cover in reverse procedure of the removing...

Страница 7: ...5 Base plate A SERVICE ACCESS 2 BASE PLATE To remove 1 Remove the setscrews A 2 Remove the base plate To attach 3 Mount the base plate in reverse procedure of the removing...

Страница 8: ...t screws A B and C and then remove the front cover by removing the set screws D E F G H I and J NOTE Unhook the tab L from the rear cover when remove the front cover TO ATTACH 2 Follow the above proce...

Страница 9: ...e page 5 2 Loosen the setscrews A B and C and remove setscrews D E and F 3 Pull up the spool pins Remove the machine socket Remove the rear cover clearing the presser foot lifter frome the slit on the...

Страница 10: ...the above limit adjust as follows 1 Set the tension dial 3 2 Remove the cover 3 Lower the presser foot If the top tension is too loose turn the lead screw in the direction A If the top tension is too...

Страница 11: ...ing The bobbin thread tension should be 45 55g when pulling the thread in the direction of B If the tension is out of the range adjust it as follows Adjustment procedure 1 Turn the adjusting screw C i...

Страница 12: ...face cover See page 4 2 Raise the presser foot lever and loosen the setscrew C on the presser bar holder Adjust the distance between the presser foot D and the needle plate D to 6 0 mm 0 24 3 Tighten...

Страница 13: ...pattern selector dial with maximum zigzag width and remove the front cover See page 6 2 Loosen two setscrews 3 Adjust the needle swing by turning the handwheel while holding the worm so as not to rot...

Страница 14: ...eedle hole on the needle plate and the needle drop positions should be equal If not adjust as follows Adjustment procedure 1 Remove the face cover See page 4 2 Set the pattern selector dial at maximum...

Страница 15: ...is too wide move the needle bar supporter to direction B If clearance is too narrow move the needle bar supporter to direction C NOTE After this adjustment check that the clearance between the needle...

Страница 16: ...e between the needle and the shuttle race in the range of 0 05 to 0 10 mm 5 Set the pattern select dial at turn the handwheel to check if the clearance between the needle and inner edges of the shuttl...

Страница 17: ...om the needle plate should be 0 75 0 90mm If it is not in the range adjust as follows Adjustment procedure 1 Open the shuttle cover 2 Lower the presser foot and turn the handwheel toward you until the...

Страница 18: ...ye and the tip of the shuttle hook should be in the range of 2 9 3 5 mm Adjustment procedure 1 Open the face cover 2 Set the pattern selector dial at 3 Open the shuttle cover 4 Remove the shuttle race...

Страница 19: ...en the shuttle cover 4 Remove the shuttle race ring 5 Turn the handwheel toward you until the tip of the shuttle hook meets the left side of the needle 6 Loosen the lower shaft crank arm screws A 7 Wh...

Страница 20: ...itch density The range of 9 12 stitches in the right side row backward feeding against 10 stitches in the left side row forward feeding is considered acceptable Adjustment procedure 1 Check the stitch...

Страница 21: ...etting the stitch length dial at S S In case of being a difference between forward feeding and backward feeding during stretch stitch pattern sewing make an adjustment as follows Adjustment procedure...

Страница 22: ...ttonhole make an adjustment as follows Adjustment procedure 1 Set the pattern selector dial at and the stitch length dial at 4 2 Remove the front cover See page 6 3 Place a piece of paper under the fo...

Страница 23: ...rn Adjustment procedure 1 Set the pattern selector dial 2 Remove the front cover See page 6 3 Put the cam follower to the zigzag cam straight cam and also put the cam follower releasing arm to the pat...

Страница 24: ...too loose it can cause the belt teeth on the motor pulley to jump 2 The correct motor belt tension is when the deflection of motor belt is about 7mm 0 28 9mm 0 36 When pushing the motor belt by finge...

Страница 25: ...socket unit B Machine socket cover WIRING 1 Remove the belt cover See page 4 2 Remove the screws A B and machine socket cover 3 Follow the above procedure in reverse Motor cord Lamp cord Motor cord L...

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