ELNA Elinita EF72 Service Manual Download

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SERVICE MANUAL

MODEL: ef72

First Edition: 09 April 2020

Summary of Contents for Elinita EF72

Page 1: ...SERVICE MANUAL MODEL ef72 First Edition 09 April 2020 ...

Page 2: ...eight and direction of presser bar 18 To adjust the feed dog height 19 To replace needle thread tension unit 20 To adjust the upper thread tension release 1 21 To adjust the upper thread tension release 2 22 Adjusting the needle thread tension 23 To adjust the bobbin winder stopper 24 Needle threader hook position 25 To adjust thread cutter switch 26 To adjust thread drawing lever 27 Replacing the...

Page 3: ...op cover To remove 1 Remove the setscrews B 2 pcs 2 Remove the bobbin winder connector and remove the top cover To attach 3 Insert the bobbin winder connector and fix the top cover with setscrews B 2 pcs Turn the foot pressure dial lightly to attach the top cover if necessary Setscrew A Face plate Top Cover Setscrew B Setscrew B Bobbin winder connector ...

Page 4: ...cover To remove 1 Remove the top cover refer to page 1 Remove the caps 2 pcs and setscrews A 2 pcs 2 Loosen the setscrew B and remove the belt cover To attach 3 Attach the belt cover and tighten the setscrew B 4 Tighten the setscrews A 2 pcs and attach the caps 2 pcs Setscrew A Belt cover Setscrew A Hook Hook Setscrew D Block of approximately height 2 cm Cap Setscrew B Base Rubber foot Rubber foot...

Page 5: ...ter cover To attach 2 Attach the thread cutter cover with the setscrew B Setscrew B Thread cutter cover Power supply cover To remove 1 Remove the setscrews A 3 pcs and remove the power supply cover To attach 1 Attach the power supply cover with setscrews A 3 pcs Setscrew A Setscrew A Power supply cover Hook ...

Page 6: ...LCD connector and printed circuit board K connector from the printed circuit board A Remove the front cover To attach 1 Follow the steps of removal procedure in reverse Setscrew B Setscrew D Changing external parts 4 Front cover Setscrew C Front cover Printed circuit board A Setscrew E Setscrew A Printed circuit board K connector LCD connector ...

Page 7: ...setscrews A and B and remove the thread guide cover To attach 1 Follow the steps of removal procedure in reverse Remove the thread guide cover carefully not to break the slit of the thread guide cover in the section C Setscrew A Setscrew B Thread guide cover Thread guide cover Slit Section C Thread guide cover ...

Page 8: ...op cover and thread guide cover refer to pages 1 and 5 2 Remove the setscrew A Loosen the setscrew B and remove the arm thread guide unit To attach 1 Follow the steps of removal procedure in reverse Setscrew A Setscrew B Arm thread guide unit Arm thread guide unit ...

Page 9: ...and disconnect all the connectors from the printed circuit board A Remove the printed circuit board A To attach 1 Follow the steps of removal procedure in reverse Refer to page 11 for how to connect disconnect the connectors to the printed circuit board A Printed circuit board A Setscrew A Setscrew A Setscrew A Setscrew A ...

Page 10: ...sconnect the connector for printed circuit board F 3 Remove the setscrews A 6 pcs and printed circuit board K 4 Disconnect the relay cable To attach 1 Follow the steps of removal procedure in reverse Relay cable Printed circuit board K Setscrew A Setscrew A Connector for printed circuit board F ...

Page 11: ...board F Snap ring CS 3 Slide volume To remove 1 Remove the front cover refer to page 4 2 Disconnect the slide volume connector from the printed circuit board F 3 Remove the snap rings CS 3 2 pcs and remove the slide volume To attach 1 Follow the steps of removal procedure in reverse Insert the projection of slide volume into the convex of speed control slider and fix it with the snap rings indicat...

Page 12: ...0 Changing LCD Setscrew A LCD Setscrew A To remove 1 Remove the front cover refer to page 4 2 Remove the setscrews A 4 pcs and remove the LCD To attach 1 Follow the steps of removal procedure in reverse ...

Page 13: ...otor white 5P Bobbin winder motor black 4P Buttonhole sensor black 3P Printed circuit board K white 28P Presser foot lifter switch white 4P Thread tension release motor black 7P Switching power supply white 4P Foot control white 2P Switching power supply Printed circuit board A Thread cutter motor switch white 6P Upper shaft sensor black 4P LCD white 16P LED arm red 2P LED arm blue 2P Needle plate...

Page 14: ... in the upper part Remove the arm thread guide unit refer to page 6 3 Tighten the setscrew 4 Attach the face plate When the straight stitch is selected the needle should be positioned in the center of the needle plate hole When the zigzag stitch is selected with the maximum stitch width of 9 0 the clearance between the side of the needle and needle hole should be 0 2 mm or more Needle hole 0 2 mm ...

Page 15: ... backlash following the adjustment procedure in step 5 Turn the lower shaft bushings front and rear in the same direction simultaneously and evenly 5 If the backlash is too much turn the lower shaft bushing in direction A If the backlash is too little turn the lower shaft bushing in direction B 6 Tighten the setscrews After adjusting the backlash check the needle bar height and hook timing Adjust ...

Page 16: ... 8 Turn the lower shaft gear until the tip of the hook meets the right side of the needle Tighten the setscrews 2 pcs After adjusting the hook timing check the needle bar height 9 Attach the bobbin holder needle plate and presser foot 10 Attach the base refer to page 2 Hook timing The amount of ascending travel of the needle bar from its lowest position to the position where the tip of the rotary ...

Page 17: ...edle bar height to 1 8 mm 7 Tighten the setscrew with the needle setting groove to the front 8 Attach the arm thread guide unit and face plate 9 Attach the bobbin holder needle plate and presser foot Needle setting groove The hook meets right side of the needle Hook race 1 6 to 2 0 mm Upper edge of needle hole Before proceeding with this adjustment check the hook timing The distance between the up...

Page 18: ...zag stitch 5 and set the stitch width to the maximum 9 0 5 Loosen the setscrew and adjust the clearance between the needle and the tip of the rotary hook as 0 10 to 0 05 mm by moving the needle bar supporter in the directions of arrows 6 Tighten the setscrew 7 Attach the needle plate and check if the clearance from the center to front or rear is 0 15 mm or less If the clearance is more than 0 15 m...

Page 19: ...y hook is 0 10 to 0 05 mm 4 Tighten the setscrews A B and C firmly Check the backlash between hook drive gear and lower shaft gear hook timing and needle bar hight Adjust if necessary after the adjustment 5 Attach the base bobbin holder needle plate presser foot and needle Setscrew C Setscrew B Setscrew A Hook setting plate Clearance between needle and tip of the rotary hook 2 The clearance betwee...

Page 20: ...foot pressure at 3 4 Drop the feed dog 5 Remove the face plate refer to page 1 6 Loosen the setscrew on the presser bar supporter to adjust the presser foot direction so that the slot for the feed dog teeth and the zigzag foot should be parallel 7 Place a 6 mm block between the presser foot and the needle plate Tighten the setscrew holding the presser foot against the block 8 Attach the face plate...

Page 21: ... Turn the handwheel toward you to raise the feed dog to its highest position 5 Loosen the setscrew A 6 Loosen the nut Adjust the feed dog height by turning the setscrew B 7 Tighten the nut 8 Tighten the setscrew A Feed dog parallel adjustment If the feed dog is not parallel to the surface of the needle plate at its highest position adjast as follows 9 For this adjustment a hexagonal socket screw 4...

Page 22: ...pages 1 5 and 6 2 Lower the presser foot lifter 3 Loosen the hexagonal socket screw 4 Remove the thread release plate from the thread release arm Remove the thread tension unit To attach 1 Follow the steps of removal procedure in reverse Hexagonal socket screw Thread tension release plate Thread tension release arm Thread tension unit ...

Page 23: ...oximately 0 8 mm 1 Remove the face plate top cover thread guide cover and arm thread guide refer to pages 1 5 and 6 2 Remove the front cover refer to page 4 3 Loosen the setscrew 4 Adjust the clearance by turning the eccentric pin 5 Tighten the setscrew Setscrew Setscrew Eccentric pin Thread tension disk Thread tension release pin Eccentric pin ...

Page 24: ...tly Remove setscrew C and slide the base to the front Tighten the setscrew A and B securely Tighten the setscrew C If the clearance is larger than 0 8 mm Loosen the setscrews A and B Tighten the setscrew B lightly Remove setscrew C and slide the base to the rear Tighten the setscrew A and B securely Tighten the setscrew C NOTE Turn the setscrew B with the plate positioned in the front cover or the...

Page 25: ...n dial at 4 1 Set the thread tension dial at 4 2 Pull the tension dial to remove it 3 Lower the presser foot 4 Turn the dial to adjust the tension To loosen the tension turn the dial counterclockwise To tighten the tension turn the dial clockwise 5 Push in the tension dial aligning 4 with the setting mark White polyester thread size 50 Tension dial Setting mark Adjusting dial Pull and remove ...

Page 26: ...bin loosen the setscrew and turn the bobbin winder stopper Turn the bobbin winder stopper in the direction of A when the thread amount for bobbin is too large Turn the bobbin winder stopper in the direction of B when the thread amount for bobbin is too small 2 Tighten the setscrew Thread amount 16 5 to 19 5mm Setscrew Bobbin winder stopper A B ...

Page 27: ...der hook is not aligned vertically with the needle eye loosen the setscrew A Adjust the rotation pin stopper position so that the hook enters into the needle eye 3 Tighten the setscrew A 4 If the threader hook is not aligned horizontally with the needle eye loosen the setscrew B Adjust the rotation pin stopper position so that the hook enters into the needle eye 5 Tighten the setscrew B Setscrew A...

Page 28: ...ng cutter moves to its home position automatically 4 The distance between the left end of moving cutter and the left end of thread cutter plate slit should be 0 7 to 1 5 mm If not adjust as follows To adjust 1 Loosen the setscrew on the thread cutter switch setting plate 2 If the distance is smaller than 0 7 mm move the plate in the direction of A If the distance is larger than 1 5 mm move the pla...

Page 29: ...the hexagonal socket screw When the thread drawing lever is at the highest position adjust the drawing lever so that the distance between the hook race and the drawing lever is 5 5 to 5 7 mm 3 Tighten the hexagonal bolt 4 Attach the needle plate Thread drawing lever 5 5 to 5 7 mm Hexagonal socket bolt Hook race View A View A Thread drawing lever Hexagonal socket bolt ...

Page 30: ...crank pin into the take up lever crank as illustrated The hexagonal socket screw long must hold the needle bar crank pin cut surface Replacing the thread take up lever Needle bar crank pin cut surface Take up lever crank Hexagonal socket scerw long Thread take up lever ...

Page 31: ... feed cam B are the same as that of the spring pin C The phase of feed lifting pin D is shown below Lower shaft gear Feed cam Thread drawing lever cam Lower shaft gear Feed lifting pin D Feed lifting pin D Feed lifting cam A B C Spring pin 3x18 X Lower shaft gear alignment mark Lower shaft gear spring pin Feed lifting pin D Phase of the feed lifting pin D View from X ...

Page 32: ...hro belt set the alignment mark A on the belt wheel at upper left 10 degrees the alignment mark B on the lower shaft gear at upper right as shown Alignment mark A Belt wheel Alignment mark B Lower shaft gear Spring pin 10 degrees Synchro belt ...

Page 33: ...lace the motor To attach 1 Fix the motor by tightening the setscrews 2 pcs lightly 2 Adjust the belt tension and tighten the setscrews 2 pcs securely 3 Connect the motor connector to the printed circuit board A Adjust motor belt tension Adjust the motor belt deflection to about 7 to 9 mm by pressing the middle of the motor belt with approximately 300 grams force of pressure Setscrew Driving motor ...

Page 34: ... needle plate If not adjust as follows To adjust 1 Remove the top cover refer to page 1 2 Turn the handwheel toward you slowly to bring the needle up from its lowest position to 7 7 mm above the surface of the needle plate 3 Loosen the setscrew of the upper shaft shield plate Turn the upper shaft shield plate away from you until the indication below Bight changes from L to H Tighten the setscrew T...

Page 35: ...the buttonhole lever guide to the front or to the rear until until the indication beside BH Sen changes to L Tighten the setscrew A 5 Attach the buttonhole foot R and lower the buttonhole lever 6 Lower the buttonhole R Adjust the clearance between the stopper and the presser foot slider to 1 6 mm 7 Loosen the hexagon socket screw until the indication beside BH Sen changes to H Tighten the hexagon ...

Page 36: ... seventh of 8 The length 5 of 8 should be 33 mm to 39 mm Stretch stitch balance dial position 1 Press the right arrow key to lower the needle the key does not work if the needle is lowered to move the adjusting screw 2 Remove the base cap 3 If the length is longer than 39 mm turn the adjusting screw in the direction of A If the length is shorter than 33 mm turn the adjusting screw in the direction...

Page 37: ...esser foot lifter switch Switch setting plate Auto lock key Needle up down key Numeral key To adjust 1 Remove the face plate 2 Place a 5 mm block between the presser foot and the needle plate and lower the presser foot 3 Loosen the setscrew on the switch setting plate 4 Raise the presser foot slowly until it stops and hold it as it is 5 Lower the switch setting plate slowly until the indication of...

Page 38: ...djust and check procedure below tighten the setscrew B securely To adjust and check 1 Prepare the standard needle plate and the needle plate for straight stitch 2 Turn the power switch on while pressing the auto lock key and needle up down key to enter the factory setting mode 3 Press the numeral key 4 to select the sensor adjusting mode 4 Check if the indication of Straight is L and the indicatio...

Page 39: ...switching power supply 3 Disconnect the connector for foot control connected to the switching power supply from the printed circuit board A 4 Remove the setscrews 3 pcs and switching power supply To attach Follow the steps of removal procedure in reverse Connector for power supply Connector for foot control Switching power supply Setscrew Setscrew ...

Page 40: ... Numeral key Sensor adjusting mode To adjust and check 1 Turn the power switch on while pressing the auto lock key and needle up doun key to enter the factory setting mode 2 Press the numeral key 4 to select the sensor adjusting mode 3 Check if the indication of FeedDog is L when the feed dog drop lever is in the right feed dog raised Check if the indication of FeedDog is H when the feed dog drop ...

Page 41: ...ck the clearance between the feed lifting cam and feed lifting cam spring When the feed lifting cam is pushed to the left the feed lifting cam spring should covered with the feed lifting cam completely If the feed lifting cam does not move smoothly adjust as follows 1 Loosen the setscrews A and B 2 Bring the needle bar at the lowest position and turn the lower shaft ring slightly to twist the coil...

Page 42: ...ft to raise the feed dog 3 Slide the speed control slider to the left 4 Raise the presser foot lifter and remove the presser foot 5 Bring the needle bar at the highest position Before using the diagnosis device 1 Check or replace the following part s if nothing happens when the power switch is turned on 1 The connectors are connected properly 2 Replace the circuit board A 3 Replace the power suppl...

Page 43: ...board A Change the printed circuit board F Change the printed circuit board K Faulty condition Buzzer does not sound The step 1 screen does not appear LED of the start stop key does not blink LCD backlight does not turn on Sewing light does not turn on To adjust or replace a part Change the LED Change the LCD Change the printed circuit board A Change the printed circuit board F Change the printed ...

Page 44: ...switch Zigzag Attach the standard needle plate Needle plate attached H Needle plate removed L 6 Buttonhole sensor BH Sen Pull the buttonhole lever toward you H Release the buttonhole lever L Pull the buttonhole lever to the back H 7 Drop feed micro switch FeedDog Move the feed dog drop lever to the left and right Left feed dog lowered H Right feed dog raised L 8 Thread cutter foot switch sensor Tr...

Page 45: ... to H or from H to L Press the start stop key to proceed to the next step Faulty condition Buzzer does not sound when the screen changes The screen does not change To adjust or replace a part Adjust the position of the upper shaft shield plate Replace the photo sensor Change the printed circuit board A Correct condition Turn the handwheel to move the needle bar to the zigzag phase up position When...

Page 46: ...ssing the needle up down key the motor starts running increasing speed evenly The motor stops at the needle up position The screen shows OK When pressing bobbin winding key the bobbin winding motor runs 8 Turn the power switch off to finish Faulty condition The motor does not run The screen shows NG The bobbin winder motor does not run The motor does not run smoothly To adjust or replace a part Re...

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