JP760

1. JP760 Service Seminar

2. Face Plate Removal 1. Remove the screw from the rear of the face plate. 2. Grab the face plate from the bottom front, and start to move it forward to release it from its holding spot. Once free, remove it. 1

3. Bed Cover Removal 1. Lay the machine down on the rear panel. Remove the four screws that hold the bed cover. 2. Raise the needle to its highest position in order for the bed cover to come off easily without hitting the feed cam. 3. Slide the bed cover off. 2

4. Front Cover Removal 1. While the machine is still laying down remove the screw underneath the free arm against the casting. 2. Remove the screw to the left of the rubber foot. ** The first JP760’S do not have this screw. Instead the rubber foot has to be removed.** 3. Stand the machine up and look into the left side where the face plate used to cover. Slide a Phillipshead screwdriver through the lamp holder and through part of the threader shaft. Make sure only to loosen the screw and not remove it fully. 3

5. 4. Loosen the screw by going above the take up lever and inserting the screwdriver into the machine. Make sure only to loosen the screw. 5. Remove the white cap and loosen the screw that is underneath the cap. 6. Remove the needle plate. 4

6. 7. Grab the front cover while holding the back and pull apart gently to get the front cover started. 8. Gently push down on the front cover to start to separate the front of the machine from the rear. 9. Pull on front cover gently and start to remove it over the stitch balance dial. 5

7. 10. Take a small flat head and push down on the rear panel to the right of the needle bar unit in order to release the front panel. 11. Continue to gently separate the front panel in order to see the wires that are connected to the A-board. 12. Disconnect the 8 plugs that are holding the front panel to the main body of the machine, and lay it to the side 6

8. Rear Cover Removal 1. Remove the screw that is holding the metal bracket at the top of the machine. 2. Remove the screw that is holding the rear panel to the casting. 3. Lay the machine down and remove the screw that holds the rear part of the free arm to the casting of the machine. 7

9. 4. Remove the screw that is on the base of the machine. 5. Stand the machine up and have the rear panel face you. Lift up the handle and remove the screw from underneath. 6. Remove the screw that holds the rear panel to the left side casting of the machine. 8

10. 7. Lower the presser foot in order to keep it safe when you are removing the rear panel. 8. Take the rear panel and gently start removing it around the machine socket unit. 9. Start to remove the rear panel away from the presser foot lifter. 10. Continue to gently remove the rear panel until separated fully. 9

11. A- Board Removal 1. Disconnect the bobbin winder switch plug and the wires that run from the F-board to the A-board. Remove the 7 screws that hold the A-board to the front panel. 2. As you remove the A-board notice that the slide volume for the speed control came from a plastic guide. 10

12. A-Board Installation 1. As you place the new A-board into position, make sure to line up the slide volume with the plastic slide guide on the front panel. 2. Reattach the bobbin winder switch plug and the F-board plug into the A-board and replace the seven screws. 11

13. Removing the Zig Zag Motor • 1. Remove the large black • covered wires from the • bracket and then from • the bracket on the zig • zag motor unit. • 2. After removing the black • covered wire, remove the • other two remaining wires • from the zig zag motor unit. 4. Remove the two screws that hold the zig zag motor unit into the casting of the machine. 3. Remove the c-clip from the zig zag motor. 5. Remove the zig zag rod from the step motor and remove the step motor from the machine. 12

14. Installing the Zig Zag Motor 1. Insert the two screws that hold the step motor to the machine and tighten them. 2. Reattach the zig zag rod into the step motor activator arm. 3. Take the two smaller wires and feed them back through the step motor unit bracket. Take the wire with the black plug and insert it into the second bracket. 4. Take the black covered wires and feed the wire back through the zig zag motor unit and then through the second bracket. 13

15. Removing the DC Motor 2. Remove the two screws that hold the motor unit to the casting of the machine. 1. Remove the motor belt from the hand wheel. 3. Cut through the white zip tie that is on the bracket attached to the feed step motor unit. Be careful not to cut through the wires. 4. Guide the motor wire through the machine and remove the dc motor unit. 14

16. Installing the DC Motor 1. Guide the motor unit wire through the casting towards the front of the machine and install and tighten the two screws temporarily. Correct 7mm deflection TOO LOOSE 2. Place the motor belt onto the hand wheel and around the motor idler. The motor is the adjustment for the correct tension on the motor belt. When the motor is screwed into a high position on the machine, the belt is loose. If the motor is pushed down and screwed in, the tension on the motor belt will be tighter. The correct tension should be about a 7mm deflection. 15

17. Removal of Machine Socket Unit 1. Remove the two screws that are on the front of the machine socket unit. 2. Loosen the screw that holds the machine socket in on the rear of the machine 3. Guide the wires from the front of the machine towards the bottom and gently guide them out from under the motor unit and remove the machine socket from the machine. 16

18. Installation of Machine Socket Unit 1. Guide the two wires underneath the motor unit and bring the wires towards the front of the machine. 2. Insert the two screws and tighten them gently. 3. Tighten the screw on the rear of the machine gently. 4. Notice the motor unit wire and the two coming from the machine socket unit. Take all three and put them behind the bracket on the feed step motor unit. Take a white zip tie and wrap it around the wires and through the bracket. Tighten the zip tie gently and cut the excess tie. 17

19. Replacing the Rear Panel 2. Gently place the rear panel on the machine going slowly and fitting it on the casting. Make sure the presser foot lifter is down and fit the rear panel carefully around it. 1. Take the rear panel and start to place it on the machine starting from the rear. Fit it over the machine socket unit to start. 4. Replace the bracket towards the top of the machine. The flat part goes against the casting and extends outward. 3. Insert the philips head screw to hold the rear panel by the neck of the machine. 18

20. 5. Replace the screw on the bottom of the machine next to the large white access cap. 6. Insert the screw underneath the free arm. 8. Tighten the screw that holds the rear panel towards the left side. 7. Lift up the handle and insert the screw. 19

21. Replacing the Front Panel 1. Reconnect the 8 wires coming from the machine to the A-board on the front panel. One plug will plug socket will remain empty. 2. Place the front panel towards the machine making sure that the wires on the inside stay away from the motor belt. Place the panel over the feed adjusting dial and make sure that the clips go on the inside of the rear panel. 3. Gently place the panel onto the casting. Be careful not to bend anything or snap anything. Fit the panel into place while checking the clips to make sure they are not exposed. **Be very careful of the front thread guide, do not force it into position.** 20

22. 4. Insert the screw driver through the lamp holder and through part of the threader shaft onto the screw and tighten it. 5. Tighten the screw inside the machine above the take up lever. 6. Tighten the screw at the top of the machine and replace the white cap. 21

23. 7. Insert the screw underneath the machine to the right of the sliding stitch panel. 8. Insert the screw that holds the front free arm to the casting. 22

24. Adjusting Center Needle Position Left to Right 1. Install the needle plate. Turn on the machine to initialize the needle. 2. Bring the needle down to the needle plate and check to see if it is the center. 3. If an adjustment is needed, locate the flat head screw with the lock nut around it. Turn the screw in or out to swing the needle bar unit into proper center position. 23

25. Adjusting Center Needle Position Front to Back **Always replace needle first.** 1. Bring the needle down into the needle plate. Check from a side view to see if the needle is centered. 2. If an adjustment is needed, locate the two screws at the top of the presser bar bracket. 3. Loosen the screws and push in or out on the threader shaft to position the needle in the center. 24

26. Adjusting Hook Timing 1. Remove the presser foot, needle plate and bobbin case. To check the hook timing, push the needle bar all the way to the left. Rotate the hand wheel towards you to bring the needle all the way down, then continue to rotate the hand wheel until the tip of the hook is at the right side of the needle. At this position the tip of the hook should be 1.6 to 2.0 mm above the top of the eye of the needle. 2. To make the adjustment, place the machine on its back. Loosen the two 2.5 mm screws on the lower shaft gear. While holding the hook race, rotate the hand wheel until the hook timing is correct. Then tighten the screws. 25

27. Adjusting Hook To Needle Clearance 3. The clearance between the hook and the needle should be as close to zero as possible, without the hook hitting the needle as it passes behind the needle in both left and right needle positions. 4. If the hook is hitting the needle, or if the hook-to-needle clearance is too large, place the machine on its back. Loosen the 3 screws on the hook base plate. Move the hook base plate until the clearance is correct. Then tighten the screws. After making this adjustment, the hook gear backlash also must be checked. 26

28. Adjusting the Hook Gear Backlash . 8mm or less 1. Rotate the hand wheel towards you until the hook point is below the legs of the feed dog. Hold the hook and rotate it left and right. At this position there should be .8mm or less rotary movement, backlash, in the hook. 2.5mm 2. If the backlash is not correct, place the machine on its back. Loosen the 2.5mm set screw. Place a small screwdriver in the slot of the lower shaft left bushing and rotate the bushing. If there is too much rotary play in the hook, move the slot DOWN. If there is too little rotary play in the hook, move the slot UP (make sure not to move the bushing left or right.) 27

29. Adjusting the Feed Dog Height 1. Install the needle plate and the presser foot. With the presser foot in the down position, turn the hand wheel to bring the feed dog to its highest position. The feed dog should be .8 to .9mm above the surface of the needle plate. . 8 to. 9mm above 2. Loosen the lock screw. Turn the adjusting screw clockwise to raise the feed dog and counterclockwise to lower the feed dog. Then tighten the set screw and the lock nut. Note: It is normal that the front of the feed dog are positioned slightly lower than the back of the feed dog. 28

30. Removing and Adjusting the Needle Threader Plate 1. To remove the needle threader plate pull down the threader. Locate the small Phillips head screw and remove the screw using a fine Philip’s head screwdriver. 2. If the threader is off left to right, move the plate so it lines up in the needle eye. Part # phldrvsp1 3. To adjust the height of the threader pin, insert a 1.5mm hexagon screwdriver into the hole of the threader setting block. If the threader pin is too high, lower the setting block. If the threader pin is too low, raise the setting block. Do not rotate the setting block left or right when you make this adjustment. Tighten the screw. 29

31. Adjusting the Buttonhole Lever 1. Locate the buttonhole lever and pull the lever down. Make sure that the buttonhole foot is off of the machine. Nothing should be hitting the lever. At this point the black shield plate on the lever should be in the middle of the sensor. Notice how the slit is lined up perfectly in the middle. 2. If an adjustment is needed locate the 1.5 hex screw that has the lock nut around it and take the 1.5 hex driver and place it into the 1.5 screw, and turn it to the left or right in order to center the shield plate within the sensor. This is a fine adjustment and cannot be made if anything is hitting against the buttonhole lever. 30

32. Reinstalling the Bed Cover 1. Make sure that the needle is in the highest position. Slide the bed cover on and be careful of the feed cam. 2. Insert the 4 screws that hold the bed cover on the machine and tighten them. 31

33. Reinstalling the Face Plate 1. Attach the face plate on towards the back first to lock in the clips. As the face plate comes towards the front, pull out gently on the face plate so that the clip can lock into the thread guide easily. 2. Insert the screw and tighten. 32

34. Adjusting the Stretch Stitch Feed Balance 1. Hold down the start/stop button and the needle up down button. 2. Press the needle up down button within 3 seconds to set the machine for sewing out multiple number 8’s. 3. When machine is started properly and the correct buttons are pushed you will see two number 8’s in the screen window. 33

35. 32 to 38 mm 4. Put a piece of fabric under the presser foot and thread the machine. Use the needle up/down button to start the 8’s test. The measurement should be between 32 to 38mm. Shown with no covers 7. If an adjustment is needed, place the machine on its back. Locate the access hole on the bottom of the machine. Take off the cap and turn the adjusting screw counterclockwise if the measurement is more than 38mm or clockwise if the measurement is less than 38mm. Access cap 34