ELNA eXcellence 780 Service Manual
  1. Manuals
  2. Brands
  3. ELNA Manuals
  4. Sewing Machine
  5. eXcellence 780
  6. Service manual

ELNA eXcellence 780 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

First Edition: 3 June 2016
SERVICE MANUAL
MODEL: eXcellence 780

Advertisement

Table of Contents
loading

Related Manuals for ELNA eXcellence 780

Summary of Contents for ELNA eXcellence 780

  • Page 1 First Edition: 3 June 2016 SERVICE MANUAL MODEL: eXcellence 780...

  • Page 2: Table Of Contents

    INDEX Changing External Parts Face cover ............................1 Top cover .............................1 Belt cover ............................2 Machine base ............................3 Base cover ............................3 Bed cover ............................3 Free arm cover ..........................4-5 Front cover ............................6-7 Rear cover ............................8-9 Replacing Electronic Components Printed circuit board A ......................... 10-11 Printed circuit board F ........................12 Switching power supply unit ......................13 Driving motor .............................14...

  • Page 3: Changing External Parts

    Changing External Parts Face cover Setscrew A Face cover To remove: 1. Open the face cover. Disconnect the connector from the face cover. Remove the setscrews A. Remove the face cover. To attach: 1. Follow the above procedure in reverse. Connector Top cover Carrying handle...

  • Page 4: Belt Cover

    Changing External Parts Belt cover Setscrew A Belt cover To remove: 1. Remove the caps from the belt cover. Remove the setscrews A and B. Setscrew B 2. Loosen the setscrew C. Setscrew C 3. Loosen the setscrew D. Remove the belt cover. To attach: 1.

  • Page 5: Machine Base

    Changing External Parts Setscrew A Machine base Setscrew B Machine base To remove: 1. Remove the setscrews A and B . 2. Remove the machne base. To attach: 1. Follow the above procedure in reverse. Setscrew B Setscrew A Base cover Setscrew A Machine base Setscrew A...

  • Page 6: Free Arm Cover

    Changing External Parts Free arm cover Needle plate To remove: 1. Remove the machine base and base cover (see page 3). Press the needle plate release lever to remove the needle plate. Free arm cover Needle plate release lever 2. Remove the pin. Bed cover Remove the bed cover (see page 3).

  • Page 7: Free Arm Cover

    4. Remove the free arm cover from the free arm while unlocking the hook A (front side of the free arm) and B (inside of the machine base) from the free arm. 5. Slide the free arm cover to the left. Remove the free arm cover.

  • Page 8: Front Cover

    Changing External Parts Front cover Setscrew A Setscrew A To remove: 1. Remove the top cover, belt cover, base cover, machine base and free arm cover (see pages 1-5). 2. Loosen the setscrews A . (Bottom of the machine) Setscrew B Setscrew C 3.

  • Page 9: Front Cover

    5. Loosen the setscrew E. Setscrew E Hooks 6. Unlock the hooks from the front cover. Remove the connectors from the circuit board A. Remove the front cover. To attach: 1. Follow the above procedure in reverse. Refer to page 7 for locating connector posts.

  • Page 10: Rear Cover

    Changing External Parts Face cover Rear cover To remove: 1. Remove the top cover, mahine base, base cover and free-arm cover (see pages 1, 3 and 4-5.) 2. Open the face cover. Disconnect the connector from the face cover. Close the face cover. Connector A Setscrew A 3.

  • Page 11: Rear Cover

    Setscrews C 5. Remove the setscrews C and D. Unlock the rear cover hook from the front cover. Setscrews D Connector A 6. Disconnect the connectors A and B from the sockets. Cut and remove the cord tie as necessary. Remove the rear cover.

  • Page 12: Replacing Electronic Components

    Replacing Electronic Components Setscrew Printed circuit board A NOTE: Do not disconnect the connectors by pulling on cord. To disconnect the connectors, grasp the connector, not the cord. To remove: 1. Remove the front cover. 2. Grasp the connector directly with your fingers and pull. Do not pull the lead wire, as this may damage the contact sleeve inside the connector.

  • Page 13: Printed Circuit Board A

    t !0 ! 1 @2 q u @7 Connect the connectors to the corresponding connector posts on the circuit board A (see page 10). Foot control connector Machine body Bobbin winder switch (blue) Touch panel !8 !7 !6 Program (Slave) Printed circuit board L1 @0 @5 @6 !4...

  • Page 14: Printed Circuit Board F

    Replacing Electronic Components CS rings Printed circuit board F To remove: 1. Remove the front cover (see page 6-7). 2. Disconnect the connectors from the circuit board A (see page 10-11). 3. Remove the CS rings. 4. Remove the setscrews, and the circuit board F. To attach: 1.

  • Page 15: Switching Power Supply Unit

    Replacing Electronic Components Switching power supply unit Switching power supply Cord guide plate To remove: 1. Remove the top cover, the belt cover and the front cover (see page 1, 2 and 6-7). 2. Loosen the setscrew A. Remove the cord guide plate. Power supply connector...

  • Page 16: Driving Motor

    Replacing Electronic Components Driving motor To remove: 1. Remove the belt cover, the top cover and the front cover (see pages 1, 2 and 6). 2. Remove the setscrews (2 pcs) and the motor belt. Remove the driving motor. Motor belt Setscrew To attach: 1.

  • Page 17: Thread Tension Unit

    Replacing Electronic Components Setscrew A Thread tension unit To remove: 1. Remove the belt cover, top cover and the front cover (see pages 1, 2 and 6-7). 2. Remove the setscrews A and B. Setscrew B 3. Cut the cable tie A. Be careful not to cut the cables. Remove the setscrew C and cords from the cable tie B.

  • Page 18: Mechanical Adjustment

    Mechanical Adjustment Feed dog height When the foot pressure dial is at “7” and the presser foot A is lowered, the highest position of the feed dog should be 0.80 to 0.90 mm from the surface of the needle plate. Adjustment 1: 1.

  • Page 19: Needle Drop Position

    Mechanical Adjustment Needle drop position When the straight stitch is selected, the needle should be positioned in the center of the needle plate hole. When the needle drop position is set at "0.0" and "9.0", the clearance between the side of the needle and the needle hole should be 0.2 mm or more.

  • Page 20: Clearance Between Needle And Tip Of The Rotary Hook

    Mechanical adjustment Clearance between needle and tip of the rotary hook (method 1) The clearance between the needle and the point of hook should be -0.1 to +0.05 mm. 1. Remove the top cover (see page 1). 2. Remove the presser foot, the needle plate and the bobbin holder.
  • Page 21 Mechanical adjustment Clearance between needle and tip of the rotary hook (method 2) The clearance between the needle and the point of hook should be -0.1 to +0.05 mm. 1. Remove the bed cover (see page 3). Setscrew A Setscrew C 2.

  • Page 22: Hook Timing

    Mechanical Adjustment Hook timing The amount of ascending travel of the needle bar from its lowest position to the position (Needle drop position 0.0) where the tip of the rotary hook exactly meets the right side of the needle should be 3.70 to 4.00 mm To adjust: Bobbin holder Hook...

  • Page 23: Needle Bar Height

    Mechanical Adjustment Needle bar height The distance between the upper edge of the needle eye and the hook race should be in the range of 1.6 to 2.0 mm when the tip of the hook meets right side of the needle in the needle drop position "0.0" as the needle ascends from its lowest position.

  • Page 24: Backlash Between Hook Drive Gear And Lower Shaft Gear

    Mechanical Adjustment Backlash between hook drive gear and lower shaft gear The rotary play of the hook should be 0.8 mm or less when the tip of rotary hook is within the width of feed dog. Width of feed dog 1.

  • Page 25: Upper Shaft Shield Plate Position

    Mechanical adjustment Upper shaft shield plate position When the machine is set for zigzag stitch, the needle should start to swing 7.7 ±0.5 mm above the surface of the needle plate. To check: 1. Attach the needle #14. 2. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button.

  • Page 26: Upper Thread Tension

    Mechanical adjustment Upper thread tension The standard upper thread tension should be 59 to 67 grams when the machine is set for pattern No.1 and the thread tension is set at "3.4", measured with a #50 polyester thread being pulled at approximately 110 mm/sec. in the direction of arrow.

  • Page 27: Tension Release Mechanism

    Mechanical adjustment Tension release mechanism When the presser foot lifter is raised, the tension release mechanism should work correctly. 1. Remove the belt cover and top cover (see pages 1-2). Convex is NOT set at tension release claw 2. Remove the front cover (see page 6-7). Thread tension gear 3.

  • Page 28: Replacing Needle Threader Hook

    Mechanical adjustment Replacing Needle threader hook To remove: 1. Push down the threader lever as far as it will go and hold it in place. Loosen and remove setscrew. 2. Release the threader lever slowly while holding the threader unit to disengage it from the threader shaft. Threader unit Setscrew 3.

  • Page 29: Needle Threader Hook Position

    Mechanical adjustment Needle threader hook position If the hook of the threader plate is damaged, change or adjust the part as follows: 1. Push down the threader lever and hold it just before the threader hook enters the needle eye. 2.

  • Page 30: Thread Drawing Lever

    Mechanical adjustment Thread drawing lever The standard height of the thread drawing lever from the surface of bobbin holder should be in the range of 5.5 – 6.0 Hook race Thread drawing lever 1. Remove the presser foot, the needle plate and the bobbin holder.

  • Page 31: Upper Feed Dog (1)

    Mechanical adjustment Upper feed dog (1) The clearance between the upper feed link shaft and upper feed lower shaft should be 2.5 mm when the upper feed adjusting dial is set to "0". To check: 1. Set the upper feed adjusting dial at “0”. Remove the belt cover and base cover (see page 2-3).

  • Page 32: Upper Feed Dog (2)

    Mechanical Adjustment Upper feed dog (2) The clearance between the dual feed foot and upper feed dog should be 4 mm when the stitch length is set at "0". * Check the upper feed dog (1) (see page 29) before this adjustment. To check: 1.

  • Page 33: Upper Feed Dog (3)

    Mechanical Adjustment Upper feed dog (3) The tip of the needle height should be 0 to 1 mm above the surface of the needle plate when the toe of the dual feed foot touch the needle plate. To check: 1. Set the upper feed adjusting dial at “0”. Attach the dual feed foot.

  • Page 34: Buttonhole Lever

    Mechanical adjustment Buttonhole lever 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press “BH Sensor” key. Buttonhole Hexagonal lever guide Setscrew 2. Open the face cover. Lower the Buttonhole lever. socket screw Loosen the setscrew on the buttonhole lever guide.

  • Page 35: Thread Cutter

    Mechanical adjustment Thread cutter The distance between the end of thread cutter plate slit and the end of moving cutter should be in the range of 0.4 to 1.2 mm. To check: 1. Remove the bed cover and free arm cover (see pages 3-4).

  • Page 36: Presser Bar Lifter Position

    Mechanical adjustment Presser bar lifter position The clearance between the presser foot and the surface of the needle plate should be 6 mm when the presser foot is raised. The presser foot (zigzag foot A) should be parallel to the slot of the feed dog teeth when attached. Presser foot bar supporter To adjust: 1.

  • Page 37: Presser Foot Lifter Stopper Position (1)

    Mechanical adjustment Presser foot lifter stopper position (1) The distance between the presser foot spring release base and the presser foot lifter should be in the range of 39.4 mm to 39.8 mm when the presser foot is raised with the presser foot lifter. Preparation: Presser foot lifter stopper 1.

  • Page 38: Presser Foot Lifter Stopper Position (2)

    Mechanical adjustment Presser foot lifter stopper position (2) Hexagonal Presser foot To adjust: socket screw lifter stopper 1. Turn the handwheel toward you to lower the needle. Raise the presser foot lifter. Loosen the hexagonal socket screw (use an Allen wrench of 2.5 mm width across flats).

  • Page 39: Automatic Presser Foot Lifter Initializing Position

    Mechanical adjustment Automatic presser foot lifter initializing position To adjust: 1. Remove the top cover. 2. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press "Foot Sensor" key. 3.

  • Page 40: Presser Bar Height

    Mechanical adjustment Presser bar height To adjust: 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press "Foot Up/Down" key. 2. Attach the foot holder lightly (Do not tighten the thumbscrew.).

  • Page 41: Stretch Stitch Feed Balance

    Mechanical adjustment Stretch stitch feed balance Adjust the stretch stitch balance dial at the setting mark. The measurement of five of test patterns should be in the range of 33 to 39 mm as shown. To adjust: 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button.

  • Page 42: Needle Plate Switch

    Mechanical Adjustment Needle plate switch Fig. 1 To check and adjustment: Needle plate sensor 1. Prepare the needle plate and the needle plate for straight stitch. 2. Insert the needle plate base plate under the fixed cutter spacer and the slide plate positioning plate. Press the ◎...

  • Page 43: Knee Lifter

    Mechanical adjustment Knee lifter To adjust: 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press "Knee lifter" key. Knee lifter is free. 2. Attach the knee lifter. Press "MEM1"...

Table of Contents