ELNA Star Edition Service Manual
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ELNA Star Edition Service Manual

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SERVICE MANUAL
MODEL: Star Edition

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Summary of Contents for ELNA Star Edition

  • Page 1 SERVICE MANUAL MODEL: Star Edition...

  • Page 2: Table Of Contents

    CONTENTS WHAT TO DO WHEN ....................... 1-3 SERVICE ACCESS FACE COVER ........................ 4 BED COVER ........................5 FRONT COVER ......................6-7 REAR COVER ....................... 8 MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT ..............9 NEEDLE DROP POSITION ..................10 NEEDLE TO HOOK TIMING..................11 NEEDLE BAR HEIGHT ....................

  • Page 3: What To Do When

    WHAT TO DO WHEN Condition Cause How to fix Reference 1. Skipping 1. Needle is not inserted properly. Insert the needle properly. Stitches 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded. Rethread. 4. Needle or thread are Use the recommended sewing needle inappropriate for fabric being and thread.
  • Page 4 Condition Cause How to Fix Reference 3. Breaking 1. Initial sewing speed is too fast. Start with medium speed. upper thread. 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4.
  • Page 5 Condition Cause How to fix Reference 6. Noisy 1. Backlash between hook gear See mechanical adjustment P. 14 operation and lower shaft gear is too “backlash (lower shaft gear)”. great. Eliminate the looseness. 2. Lower shaft gear is loose. See part removal and replacement P.

  • Page 6: Service Access

    SERVICE ACCESS (1) FACE COVER TO REMOVE: 1. Remove the setscrew (A) and remove the face cover. TO INSTALL: 2. Follow the above procedure in reverse. Face cover Setscrew (A)

  • Page 7: Bed Cover

    SERVICE ACCESS (2) BED COVER TO REMOVE: 1. Set the drop lever to the left and remove the 4 setscrews (A), remove the bed cover. TO INSTALL: 2. Set the drop lever to the left and install the bed cover. Secure the bed cover with the 4 setscrews (A).

  • Page 8: Front Cover

    SERVICE ACCESS (3-1) FRONT COVER TO REMOVE: 1. Remove the face cover (see page 4). 2. Loosen the setscrew (A) and (B) then remove the setscrew (C) and (D). 3. Remove the cap and loosen setscrew (E). 4. Disconnect all the connectors from the circuit board-A. NOTE: Do not disconnect the connectors by pulling on cord.

  • Page 9: Front Cover

    SERVICE ACCESS (3-2) FRONT COVER TO REMOVE: 5. Disengage the 6 hooks (indicated by white arrows) and clear the feed balancing dial. 6. Remove the front cover. TO INSTALL: 7. Follow the above procedure in reverse. Feed balancing dial...

  • Page 10: Rear Cover

    SERVICE ACCESS (4) REAR COVER TO REMOVE: 1. Remove the front cover (see pages 6, 7). 2. Loosen setscrews (A), (B), (C), (D), (E), and (F), then remove the rear cover. NOTE: Remove the presser lifter from the rear cover first while presser lifter lowered. TO INSTALL: 3.

  • Page 11: Mechanical Adjustment

    MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT When the presser foot is raised, the clearance between the presser foot and the needle plate should be 5.5-6.2 mm. When the presser foot is lowered, the edge of the foot and the feed dog window on the needle plate should be parallel.

  • Page 12: Needle Drop Position

    MECHANICAL ADJUSTMENT NEEDLE DROP POSITION Set the stitch pattern to " ". The standard needle drop position should be at center of the needle plate hole. Select zigzag stitch " ", and set the stitch width at " 5.0 ". The clearance between the needle and the edge of the needle hole in the needle plate should be at least 0.2 mm on either side.

  • Page 13: Needle To Hook Timing

    MECHANICAL ADJUSTMENT NEEDLE TO HOOK TIMING When the machine is set for zigzag stitch (maximum zigzag width) at the right needle position, the amount of ascending travel of the needle bar from its lowest position at the right needle drop to the position where the tip of the hook meets the right side of the needle should be 1.4 to 2.0mm.

  • Page 14: Needle Bar Height

    MECHANICAL ADJUSTMENT NEEDLE BAR HEIGHT When the tip of the 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 hook should be in the range of 3.0 to 3.6 1.

  • Page 15: Clearance Between Needle And Hook Point

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND HOOK POINT * The clearance between the needle and the point of hook should be –0.1 to +0.05 mm. PREPARATION: 1. Remove the needle plate, bobbin holder, and bed cover, and replace the needle with the test pin. 2.

  • Page 16: Backlash (Lower Shaft Gear)

    MECHANICAL ADJUSTMENT BACKLASH (LOWER SHAFT GEAR) TO CHECK: 1. Turn the power switch off. 2. Remove the needle plate and bobbin holder. 3. Turn the handwheel slowly toward you until the tip of the hook is between both ends of feed dog. 4.

  • Page 17: Feed Dog Height

    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. Remove the bed cover (see page 5). 2. Turn the power switch on. 3.

  • Page 18: Needle Swing Timing

    MECHANICAL ADJUSTMENT NEEDLE SWING TIMING The needle should start to swing between 6.3 and 7.5 mm above the surface of the needle plate when the machine is set for zigzag stitching. 1. Remove the front cover (see pages 6, 7). 2.

  • Page 19: Needle Thread Tension

    MECHANICAL ADJUSTMENT NEEDLE THREAD TENSION The top tension should be between 75 and 90g when pulling the thread up in the direction of "C". * Use polyester sewing thread #50 (White). * If it is not within the above limit, adjust as follows. 1.

  • Page 20: Stretch Stitch Feed Balance

    MECHANICAL ADJUSTMENT STRETCH STITCH FEED BALANCE When a stretch pattern is sewn with the feed balancing dial set at the standard setting mark '' '', the pattern should be as indicated with the '' '' mark in the figure below. (If the stitch feed is not balanced, adjust it as follows: 1.

  • Page 21: Replacement And Adjustment Of The Needle Threader Plate

    MECHANICAL ADJUSTMENT REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE If the hook of the threader plate is damaged, change or adjust the part as follows: TO CHANGE THE THREADER PLATE: TO REMOVE: 1. Push down the needle threader knob and pull the needle threader plate (A) down to remove it (see Fig. 1). 2.

  • Page 22: Adjusting Buttonhole Lever Position

    ADJUSTING BUTTONHOLE LEVER POSITION ADJUSTING BUTTONHOLE LEVER POSITION TO ADJUST THE BUTTONHOLE LEVER GUIDE: 1. Enter the buttonhole sensor adjusting mode. (See below. The LED should display "H" or "L".) 2. Remove the face cover (see page 4) and loosen setscrew (A). 3.

  • Page 23: Replacing The Electronic Components

    REPLACING THE ELECTRONIC COMPONENTS LOCATION OF THE CONNECTORS NOTE: * Do not disconnect the connectors by pulling on the cord. * To disconnect, grasp the connector, not the cord. * Connect the connector to the connector post of the same color on the circuit board. Bobbin winder switch BH sensor Machine socket...

  • Page 24: Self Diagnostic Tests

    SELF DIAGNOSTIC TESTS Preparation: 1. Turn the power switch. 2. Move the bobbin winder spindle to the left. 3. Raise the feed dog. 4. Set the speed control lever to the left. 5. Remove the presser foot and raise the presser foot lifter. 6.
  • Page 25 Step and items Procedure Correct Condition to check Turn on the power switch while Beeping sound when the button pressed. 7 - segment simultaneously pressing the needle LED display "8.8". And it blinks in one up/down button and start/stop button. second intervals.
  • Page 26 Step and items Procedure Defective condition Correct Condition to check Press the needle up/down button, When the needle is at LED display is different from that Upper shaft LED displays "07" for one second. the highest position, LED shown to the left. sensor Turn the handwheel toward you to 1.

  • Page 27: Replacing Printed Circuit Board A

    REPLACING PRINTED CIRCUIT BOARD A TO REMOVE: 1. Remove the front cover (see pages 6, 7). 2. Pull out connectors from the circuit board-A (see page 21). 3. Loosen 7 setscrews and remove the circuit board-A. TO INSTALL: 4. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord.

  • Page 28: Replacing Printed Circuit Board F

    REPLACING PRINTED CIRCUIT BOARD F TO REMOVE: 1. Removed the front cover (see pages 6, 7). Pull out the circuit board-F connector, from the circuit board-A. 3. Loosen the setscrew and remove the board-F. TO INSTALL: 4. Follow the above procedures in reverse. NOTE: * Insert the lower part of the board-F into the hole of rear cover when attaching the board-F.

  • Page 29: Replacing Dc Motor And Adjusting Motor Belt Tension

    REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION DRIVING MOTOR (DC MOTOR) TO REMOVE: 1. Remove the front cover and the rear cover (see pages 6-8). 2. Loosen 2 setscrews and remove the driving motor and the belt. TO INSTALL: 3.

  • Page 30: Replacing Switching Regulator (Unit)

    REPLACING SWITCHING REGULATOR (UNIT) TO REMOVE: 1. Remove the front cover and the rear cover. 2. Loosen 2 setscrews (A) and a setscrew (B), then remove the switching regulator. TO INSTALL: 3. Follow the above procedures in reverse. NOTE: * Cords should not contact the lower shaft, motor belt etc. Setscrew (B) Switching regulator Setscrews (A) (2)

  • Page 31: Replacing Stepping Motor (Zigzag)

    REPLACING STEPPING MOTOR (ZIGZAG) TO REMOVE: 1. Remove the front cover and the rear cover (see pages 6-8). 2. Remove 2 setscrews. 3. Remove E-ring. 4. Remove stepping motor (zigzag). TO INSTALL: 5. Follow the above procedures in reverse. NOTE: * Check the needle drop position after replacing the stepping motor.

  • Page 32: Replacing Stepping Motor (Feed)

    REPLACING STEPPING MOTOR (FEED) TO REMOVE: 1. Remove the front cover and the rear cover (see pages 6-8). 2. Remove 2 setscrews. 3. Remove E-ring. 4. Remove stepping motor (feed). TO INSTALL: 5. Follow the above procedures in reverse. NOTE: * Check the stretch stitch balance after replacing the stepping motor.

  • Page 33: Oiling

    OILING Factory lubricated parts will provide years of household sewing without routine oiling. However, whenever the ma- chine is being serviced, check to see if any parts need to be lubricated. OIL: Use good quality sewing machine oil at the points ( A, B, C, D, E, F, G, H, J, K ) indicated by black arrows. GREASE: White grease is recommended for use on gears and cam surfaces.

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