ELNA eXpressive920 Service Manual
  1. Manuals
  2. Brands
  3. ELNA Manuals
  4. Sewing Machine
  5. eXpressive920
  6. Service manual
ELNA eXpressive920 Service Manual

ELNA eXpressive920 Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

First Edition 01 September 2015
SERVICE MANUAL
eXpressive920

Advertisement

Table of Contents
loading

Related Manuals for ELNA eXpressive920

Summary of Contents for ELNA eXpressive920

  • Page 1 First Edition 01 September 2015 SERVICE MANUAL eXpressive920...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Replacing External Parts Face cover .................................1 Belt cover ..................................1 Top cover unit ................................2 Base plate ..................................3 Base cover .................................3 Bed cover ..................................3 Free arm cover ................................4 Front cover .................................5 Rear cover .................................6 Replacing Mechanical Parts Needle threader holder (threader hook) ........................7 Replacing Electronic Components Printed circuit board A ...............................8 Printed circuit board U1 .............................9...

  • Page 3: Replacing External Parts

    Replacing External Parts (1) 　 Face cover Setscrews A Face cover To remove: 1. Open the face cover. Disconnect the connector. 2. Remove the setscrews A (2 pcs.). Remove the face plate. To attach: 1. Follow the above procedure in reverse. Connector Setscrews B Belt cover...

  • Page 4: Top Cover Unit

    Replacing External Parts (2) 　 Setscrew A Top cover unit Setscrew B To remove: 1. Open the top cover. Remove the setscrews A and B. 2. Close the top cover. Raise the carrying handle. Remove the setscrew C. Setscrew C 3.

  • Page 5: Base Plate

    Replacing External Parts (3 ) 　 Base plate Setscrews A Setscrew B To remove: 1. Remove the setscrews A (3 pcs.). 2. Remove the setscrews B (2 pcs.). 3. Remove the base plate. To attach: Follow the above procedure in reverse. Setscrew B Setscrew A Base plate...

  • Page 6: Free Arm Cover

    Replacing External Parts (4) Free arm cover To remove: Needle plate 1. Remove the presser foot. Push down the needle plate release lever to remove the needle plate. Remove the bed cover (see page 3). Needle plate release lever 2. Remove the threaded pin. 3.

  • Page 7: Front Cover

    Replacing External Parts (5) Front cover To remove: 1. Remove the belt cover and top cover (see pages 1 and 2). 2. Loosen the setscrews (A, B, C, D, E and F). 3. Push down the rear cover through the holes (G and H) with a screwdriver to unhook it from the front cover.

  • Page 8: Rear Cover

    Replacing External Parts (6) Rear cover Face cover Connector Setscrew A To remove: 1. Remove the belt cover, top cover and base cover (see page 1, 2 and 3). 2. Open the face plate and disconnect the connector. 3. Loosen the setscrews A and B. Setscrew B 4.

  • Page 9: Replacing Mechanical Parts

    Replacing Mechanical Parts Needle threader holder (threader hook) To remove: 1. Loosen the setscrew to remove the needle threader holder. Setscrew 2. Disassemble the threader unit and replace the threader hook. Refer the following part number when ordering service parts. 862627005: Hook holder (unit) Hook holder (unit) (862627005) To attach:...

  • Page 10: Replacing Electronic Components

    Replacing Electronic Components Printed circuit board A Setscrew Setscrew 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 (see page 5). 2. Disconnect the connectors. Remove the setscrews (4 pcs.) and printed circuit board A.

  • Page 11: Printed Circuit Board U1

    Replacing Electronic Components Printed circuit board U1 Setscrew Setscrew Printed circuit board U1 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 top cover (see page 2). 2.

  • Page 12: Printed Circuit Board U2

    Replacing Electronic Components Printed circuit board U2 NOTE: Setscrew A Do not disconnect the connectors by pulling on cord. To disconnect the connectors, grasp the connector, not the Cord binder cord. To remove: 1. Remove the base plate (see page 3). 2.

  • Page 13: Printed Circuit Board K

    Replacing Electronic Components Printed circuit board K 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 (see page 5). 2. Disconnect the connectors from the circuit board K. 3.

  • Page 14: Printed Circuit Board F

    Replacing Electronic Components Printed circuit board F To remove: 1. Remove the front cover (see page 5). 2. Disconnect the connector A from the circuit board K. Remove the sticky tapes (2 places). Sticky tape Connector A Printed circuit board F 3.

  • Page 15: Auxiliary Power Supply Unit

    Replacing Electronic Components Setscrew Auxiliary power supply case unit To remove: 1. Remove the belt cover, top cover, front cover and the rear cover (see pages 1, 2, 5 and 6). 2. Disconnect the connector of the auxilliary power supply unit from the printed circuit board A (see page 8).

  • Page 16: Switching Power Supply Unit

    Replacing Electronic Components Switching power supply unit To remove: 1. Remove the belt cover, top cover, front cover and the rear cover (see pages 1, 2, 5 and 6). 2. Remove the auxilliary power supply case unit (see page 13). To board A 3.

  • Page 17: Usb Unit

    Replacing Electronic Components USB unit To remove: 1. Remove the belt cover, top cover and the front cover (see pages 1, 2 and 5). 2. Disconnect the the USB unit connector from the printed circuit board A (see page 8). Cut the tie band of the ferrite core.

  • Page 18: Driving Motor

    Replacing Electronic Components DC motor To remove: 1. Remove the belt cover, the top cover and the front cover (see pages 1, 2, and 5). 2. Detach the ferrite core (fixed with a sticky tape) from the base plate for ferrite cores. 3.

  • Page 19: Thread Tension Unit

    Replacing Electronic Components Thread tension unit To remove: 1. Remove the belt cover and the top cover (see page 1 and 2). 2. Remove the front cover (see page 5). 3. Remove the setscrew A and cord guide. Remove the setscrew B and shield guide plate.

  • Page 20: Needle Threader Motor

    Replacing Electronic Components Needle threader motor To remove: 1. Remove the top cover (see page 2). Disconnect the connector form the face cover. Connector 2. Loosen the setsrew A. Setscrew A Setscrew B Motor cover 3. Remove the setscrew B and remove the motor cover. Needle threader motor cords Spiral cord binder 6.

  • Page 21: Mechanical Adjustment

    Mechanical Adjustment Feed dog height The highest position of the feed dog should be between 0.80 and 0.90 mm from the surface of the needle plate. 1. Attach the zigzag foot A. Remove the bed cover Zigzag foot A (see page 3). 0.8 –...

  • Page 22: 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 23: Hook Timing

    Mechanical Adjustment Hook timing The amount of ascending travel of the needle bar from its left and lowest position until the tip of the rotary hook meets the right side of the needle should be 3.70 to 4.00 mm 1. Remove the bed cover (see page 3). Left needle position Tip of hook meets the right side of the needle...

  • Page 24: 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 at the left needle drop position and in the ascending motion from its lowest position. Tip of hook meets the right side of the needle Left needle position...

  • Page 25: Clearance Between Needle And Tip Of 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 2). 2. Remove the presser foot, the needle plate and the bobbin holder.
  • Page 26 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 C Setscrew A 2.

  • Page 27: 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 28: 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 7.2 to 8.2 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 to enter the factory setting mode.

  • Page 29: 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. 1 Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode.

  • Page 30: Tension Release Mechanism

    Mechanical Adjustment Tension release mechanism The tension disk should open when the presser foot is raised and the tension disk should close when the presser foot is lowered. To check: Thread tension gear Tension disk opens Projection 1 Remove the belt cover and top cover (see pages 1 and 2). 2.

  • Page 31: Needle Threader Hook Position

    Mechanical Adjustment Needle threader hook position The threader hook comes out through the needle eye from behind when the needle threader button is pressed. Check: 1. Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode.

  • Page 32: 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 to 6.0 mm. 1. Remove the presser foot, the needle plate and the bobbin Hook race Thread drawing lever holder.

  • Page 33: Upper Feed Dog

    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 pages 1 and 3).
  • Page 34 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 31) before this adjustment. To check: 1 Set the upper feed adjusting dial at “0”.
  • Page 35 Mechanical Adjustment Upper feed dog (3) The dual feed foot sits on the needle plate firmly with no gap when the needle tip comes 1 mm or less above the needle plate. To check: 1 Set the upper feed adjusting dial at “0”. Attach the dual feed foot.

  • Page 36: Buttonhole Lever Adjustment

    Mechanical Adjustment Buttonhole lever adjustment 1 Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode. Press "BH Sensor" key. Reverse stitch button Start/Stop button Setscrew Buttonhole Hexagonal 2. Open the face cover. Lower the Buttonhole lever. lever guide socket screw Loosen the setscrew of the buttonhole lever guide.

  • Page 37: Thread Cutter

    Mechanical Adjustment Thread cutter The distance between the end of thread cutter plate slit and the edge 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). 2.

  • Page 38: 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. To adjust: Presser foot lifter button 1.

  • Page 39: Presser Foot Lifter Stopper Position

    Mechanical Adjustment Presser foot lifter stopper position (preparation) The distance between the presser foot spring release base Presser foot and the presser foot lifter should be in the range of 39.4 mm to lifter stopper 39.8 mm when the presser foot is raised with the presser foot lifter.
  • Page 40 Mechanical Adjustment Presser foot lifter stopper position (preparation continued) Carrying handle supporter 8. Remove the setscrews E and F. Disconnect the connector and remove the carrying handle Setscrew E supporter. Setscrew F Connector Front bracket 9. Remove the supporter spring. Setscrew G Remove the setscrews G and H.

  • Page 41: Presser Foot Lifter Stopper Position

    Mechanical Adjustment Presser foot lifter stopper position (adjustment) To adjust: Presser foot lifter button 1. Turn the power switch on. Press the presser foot lifter button to lower the presser foot. Turn the power switch off. 2. Turn the handwheel toward you to lower the needle. Raise the presser foot lifter.

  • Page 42: Automatic Presser Foot Lifter Initializing Sensor Position

    Mechanical Adjustment Automatic presser foot lifter initializing sensor position To adjust: 1. Remove the top cover (see page 2). 2. Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode. Press "Foot Sensor"...

  • Page 43: 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 to enter the factory setting mode. Press "Foot Up/Down" key. 2. Attach the foot holder lightly (Do not tighten the thumbscrew.).

  • Page 44: Embroidery Foot Height

    Mechanical Adjustment Embroidery foot height The clearance between the embroidery foot and the surface of the needle plate should be in the range of 1.7 mm to 1.9 mm when the presser bar is lowered. To adjust: 1. Attach the embroidery foot (P). 2.

  • Page 45: Stretch Stitch Balance

    Mechanical Adjustment Stretch stitch 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 check: 1. Attach the satin stitch foot (F). 2.

  • Page 46: Knee Lifter

    Mechanical Adjustment Knee lifter To adjust: 1. Attach the knee lifter. 2. Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode. Press "Knee lifter" key. Reverse stitch button Start/Stop button Knee lifter attached 3.

  • Page 47: Remaining Bobbin Thread Sensor

    Mechanical Adjustment Remaining bobbin thread sensor 1. Prepare an empty bobbin, half wound bobbin (wind to 12.5 mm diameter) and full wound bobbin (wind to18.9 mm diameter). 2. Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button to enter the factory setting mode.

  • Page 48: Cloth Guide Start Position

    Mechanical Adjustment Cloth guide start position The distance between the cloth guide and center needle position should be 15 mm when the cloth guide is at the start position. 1. Turn the power switch off. Attach the embroidery unit. (Do not open the Y-carriage.) 2.

  • Page 49: Preparation

    Mechanical Adjustment Preparation Remove Y-carriage cover (upper), X-carriage cover and Embroidery unit cover before replacing to access car- riage parts. • Removing Y-carriage cover (upper) Push down the carriage arm release lever Extend the carriage arm. Swing out the carriage arm until it locks in fully extended position.

  • Page 50: Removing X-Carriage Cover And Embroidery Unit Cover

    Mechanical Adjustment • Removing X-carriage cover and Embroidery unit cover Remove the setscrews (3 pcs.). Remove the X-carriage cover (unit). Remove the setscrews...
  • Page 51 Mechanical Adjustment Turn the embroidery unit upside down. Remove the setscrews Turn the embroidery unit again. Push down the carriage arm release lever Retract the carriage arm to the stored position. Move the carriage arm as far as it goes in the direction of ⁄0 arrow ⁄1...
  • Page 52 Mechanical Adjustment Remove the embroidery unit cover (unit). ⁄2 ⁄3 Position the flexible cable under the guide plate the cable will not be damaged when moving. ⁄4 Move the carriage arm in the direction of arrow ⁄5 Push down the carriage arm release lever Extend the carriage arm.

  • Page 53: Replacing X-Motor

    Mechanical Adjustment Replacing X-motor • Removing X-motor Disconnect the connector from printed circuit board S1. Pry up the lock tab of the connector with a precision driver , orange and red cords. and pull out the brown Precision screwdriver Remove the setscrews to remove the X-motor.

  • Page 54: Removing Film

    Mechanical Adjustment Remove the Y-carriage cover (lower). • Removing Film Remove the setscrews (2 pcs.) on the film holder. Remove the film holder and the film.

  • Page 55: Removing Film Guides

    Mechanical Adjustment • Removing Film guides Remove the setscrews on the film guides. Remove the setscrews (2 pcs.) on the film guides. • Removing Y-carriage Pull the cable in the direction of arrow to disconnect the flexible cable from the printed circuit board S2. Remove the setscrews (2 pcs.).
  • Page 56 Mechanical Adjustment ⁄0 Remove the setscrews (3 pcs.) and (3 pcs.). ⁄1 Remove the setscrews (3 pcs.). ⁄2 The Y-carriage is removed.

  • Page 57: Removing Y-Motor

    Mechanical Adjustment • Removing Y-motor ⁄3 Loosen the hexagonal socket screw ⁄4 Slide the stopper in the direction of arrow to access the setscrew Remove the setscrew Remove the setscrew ⁄5...
  • Page 58 Mechanical Adjustment ⁄6 The Y-motor is separated from the base Remove the setscrews (2 pcs.). ⁄7 ⁄8 Remove the cord binder and disconnect the connector from the printed circuit board S2 Pry up the lock tab of the connector with a precision driver ⁄9 and pull out the red , orange...

  • Page 59: Replacing Printed Circuti Board S1

    Mechanical Adjustment Replacing Printed Circuit Board S1 Remove the Y-carriage cover (lower) (refer to pages 51- 52). Remove the setscrew Disconnect the connectors from the printed circuit board Remove the printed circuit board S1. To attach, follow the above procedure in reverse.

  • Page 60: Replacing Film

    Mechanical Adjustment Replacing Film • Removing film To remove the film, remove the setscrews (2 pcs.) on the film holder. Remove the film holder and the film. • Attaching film Replace the film. Insert the film in the film cover. Insert the both edges of the film in the guides , then move the film in the direction of arrow.

  • Page 61: Replacing X-Sensor

    Mechanical Adjustment Replacing X-sensor • Removing X-sensor Disconnect the connector from printed circuit board S1. Pry up the lock tab of the connector with a precision driver and pull out the brown , orange and red cords. Precision screwdriver Remove the setscrew Remove the X-sensor.
  • Page 62 Mechanical Adjustment Attach the embroidery unit to the MC12000. Insert the machine plug into the power inlet. Insert the power supply plug into the wall outlet and turn the power switch on. The embroidery unit carriage position is initialized. The range between A and B should be in the range of 10.1 mm to 11.1 mm.

  • Page 63: Replacing X-Belt

    Mechanical Adjustment Replacing X-belt • Removing X-belt Remove the setscrews q (2 pcs.). Remove the X-belt base plate. Remove the setscrews w (3 pcs.). Replace the X-belt. • Attaching X-belt Hook the X-belt to the pulley under the X-belt base plate. Hook the X-belt to the pulley of X-motor.

  • Page 64: Replacing Printed Circuit Board S2

    Mechanical Adjustment Replacing Printed Circuit Board S2 Remove the Y-carriage cover (lower) (refer to pages 51- 52). Remove the setscrew Disconnect the connector and flexible cable from the printed circuit board S2. Remove the printed circuit board S2. Replacing Y-sensor •...

  • Page 65: Replacing Y-Belt

    Mechanical Adjustment Replacing Y-belt • Removing Y-belt Remove the hexagonal socket screw q. Slide the stopper in the direction of arrow. Remove the setscrews w. Remove the setscrews e. Remove the Y-belt. • Attaching Y-belt Attach the Y-belt. Be sure that the Y-belt deflection to about 3 mm by pressing the middle of Y-belt with approximately 30 grams of pressure.

  • Page 66: Carriage Adjustment (Backlash Of Y-Carriage)

    Mechanical Adjustment Y-carriage adjustment If there is a play at Y-carriage, follow the procedure below. Push down the carriage arm release lever Extend the carriage arm. Swing out the carriage arm until it locks in fully extended position. Turn the embroidery unit upside down. Remove the cover Move the Y-carriage under the hole...

Table of Contents