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Table of Contents
Related Manuals for ELNA Elnita ec 30
Summary of Contents for ELNA Elnita ec 30
- Page 1 First Edition: 25 June 2020 SERVICE MANUAL MODEL: ec 30...
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Page 2: Table Of Contents
Contents WHAT TO DO WHEN ........................1 - 3 CHANGING EXTERNAL PARTS FACE COVER ............................4 BED COVER ............................5 FRONT COVER ............................6 REAR COVER ............................7 MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT ........................8 NEEDLE DROP POSITION ........................9 ADJUSTMENT OF HOOK TIMING .......................10 ADJUSTMENT OF NEEDLE BAR HEIGHT ..................11 CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK ..........12 FEED DOG HEIGHT ..........................13 BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR ...........14... -
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 the fabric and the thread. being sewn. 5. Sewing on stretch fabric. Use a HAx1 #11 blue tip needle. 6. Inappropriate needle bar See mechanical adjustment “Adjustment P. 11 height. of Needle bar height”. 7. Inappropriate needle to hook See mechanical adjustment “Adjustment P. - Page 4 WHAT TO DO WHEN Condition Cause How to Fix Reference 3. Breaking 1. Initial sewing speed is Start with medium speed. upper too fast. thread. 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4. Top tension is too strong. Adjust top tension correctly. 5. Needle size is inappropriate for Use appropriate needle for fabric and fabric. thread in use. 6. Needle eye is worn. Change the needle. 7. Needle hole in needle plate is Repair the hole or replace the needle worn or burred.
- Page 5 WHAT TO DO WHEN Condition Cause How to fix Reference 6. Noisy 1. Backlash between hook gear Eliminate the backlash. P. 14 operation and lower shaft gear is too great. 2. Lower shaft gear is loose. Eliminate the looseness. P. 14 3. Inappropriate belt tension. See part removal and replacement P. 26 “Driving motor (DC motor)”. 4. Not enough oil. Oil all moving parts. 5. Upper shaft gear is loose. Eliminate the looseness. 7. Deformation 1. Inappropriate feed balance. Adjust the feed balancing screw. P. 16 pattern 2. Top tension is too strong. See mechanical adjustment P.
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Page 6: Changing External Parts
CHANGING EXTERNAL PARTS FACE COVER To remove: 1. Remove the setscrew q. 2. Remove the face cover w. To attach: 3. Follow the above procedure in reverse. -
Page 7: Bed Cover
CHANGING EXTERNAL PARTS BED COVER To remove: 1. Remove the setscrew q. 2. Remove the setscrew w. 3. Move the bed cover e to the left to unlock the cover. 4. Slide the bed cover to the up to remove the cover. To attach: 5. Follow the above procedures in reverse. -
Page 8: Front Cover
CHANGING EXTERNAL PARTS FRONT COVER To remove: 1. Remove the face cover and bed cover (Refer to pages 4 and 5). 2. Remove the setscrews q (2 pcs.). 3. Loosen the setscrew w. 4. Loosen the setscrew e. 5. Loosen the setscrew r. 6. Remove the setscrew t. 7. Disengage the front cover and rear cover hooks. 8. Remove the front cover y. 9. Disconnect all the connectors from the circuit board A. NOTE: Do not disconnect the connectors by pulling cords. To disconnect, grasp the connector, not the cord. To attach: 9. Follow the above procedures in reverse. See "PRINTED CIRCUIT BOARD A CONNECTION" (Page 23). -
Page 9: Rear Cover
CHANGING EXTERNAL PARTS REAR COVER To remove: 1. Remove the face cover, bed cover and front cover (Refer to pages 4 to 6). 2. Remove the setscrew q. 3. Remove the setscrews w (4 pcs.). 4. Remove the rear cover e. 5. Disengage the rear cover e and thread tension hooks r. To attach: 6. Follow the above procedures in reverse. -
Page 10: Mechanical Adjustment
MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT The distance between the bottom of the presser foot in up position and the needle plate should be 6.0 mm. 1. Remove the face plate and needle. 2. Lower the feed dog below the needle plate. Place 6.0 mm thick block under the presser foot and lower the presser foot lifter. 3. Loosen the hexagonal socket screw. Raise the presser foot lifter and tighten the setscrew firmly. Attach the needle and face plate. NOTE: Make sure that the presser foot should be parallel to the feed dog slots in the needle plate. Hexagonal socket screw Presser foot lifter Zigzag foot (A) Needle plate Presser foot should be parallel to the feed dog slots. 6.0 mm Feed dog slots Block Feed dog... -
Page 11: Needle Drop Position
MECHANICAL ADJUSTMENT NEEDLE DROP POSITION Select the zigzag stitch . Set the stitch width to “5.0”. The clearance between the needle drop position and the edge of needle should be 0.2 mm or more for both sides. If not, make the adjustment as follows: 1. Turn the power switch on. 2. Remove the face cover (Refer to page 4). 3. Set the stitch width to “5.0”. 4. Make the following adjustments if the clearance between the needle drop position and the adge of the needle are even for both sides. * Turn the setscrew clockwise (in the direction of A) if the clearance on the right side of the needle plate hole is smaller than 0.2 mm. * Turn the setscrew counter clockwise (in the direction of B) if the clearance on the left side of the needle plate hole is smaller than 0.2 mm. NOTE: Check the hook timing after this adjustment. Setscrew Needle plate hole 0.2 mm 0.2 mm or more or more A = B... -
Page 12: Adjustment Of Hook Timing
MECHANICAL ADJUSTMENT ADJUSTMENT OF HOOK TIMING Select the zigzag stitch Set the stitch width to “5.0”. The amount of ascending travel of the needle bar from its lower position to the position where the tip of the rotary hook exactly meets the right side of the needle should be 1.4 to 2.0 mm. 1. Remove the bed cover (Refer to page 5). 2. Select the zigzag stitch . Set the stitch width to “5.0”. Bring the needle at right lowest needle position. 3. Remove the setscrew on the needle plate, the needle plate and the bobbin holder. 4. Loosen the hexagonal socket screws on the lower shaft gear. 5. Turn the handwheel toward you to raise the needle bar 1.7 mm from its right lowest position. 6. While holding the handwheel to prevent the needle bar from moving, turn the lower shaft gear in the direction of arrow until the tip of the rotary hook exactly meets the right side of the needle. 7. Tighten the hexagonal socket screws on the lower shaft gear. 8. Attach the bobbin holder, needle plate and bed cover. Setscrew Hexagonal socket screw Needle plate Bobbin holder Hexagonal socket screw Lower shaft gear Tip of hook meets the right side of the needle Right position 1.4 to 2.0 mm Lowest needle position... -
Page 13: Adjustment Of Needle Bar Height
MECHANICAL ADJUSTMENT ADJUSTMENT OF NEEDLE BAR HEIGHT The standard distance between the upper edge of the needle eye and the upper surface of the hook race should be in the range of 3.0 to 3.6 mm when the hook point meets the right side of the needle in its ascending travel from right lowest position of the maximum width zigzag stitch. 1. Remove the face cover and bed cover (Refer to pages 4 to 5). 2. Turn the power switch on. Select the zigzag stitch , and set the stitch width to “5.0”. Bring the needle to the right lowest position. 3. Remove the setscrew on the needle plate, the needle plate and the bobbin holder. 4. Turn the handwheel toward you until the hook point meets the right side of the needle. 5. Loosen the hexagonal socket screw and move the needle bar up or down to adjust the needle height. 6. Tighten the hexagonal socket screw. 7. Attach the bobbin holder, needle plate and face cover and bed cover. NOTE: Before performing this adjustment, check the needle to hook timing. Setscrew Needle plate Hexagonal socket screw Bobbin holder Tip of hook meets the right side of the needle Upper surface of hook race Right position 3.0 to 3.6 mm Upper edge of needle eye Hook race (unit) -
Page 14: Clearance Between Needle And Tip Of The Rotary Hook
MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK * The clearance between the needle and the point of hook should be –0.10 to +0.05 mm. Adjustment procedure: 1. Remove the face cover. (Refer to page 4). 2. Remove the needle plate and bobbin holder. Attach the master needle. Turn the power switch on. Select the zigzag stitch , and set the stitch width to “5.0”. 3. Remove the setscrew on the needle plate, the needle plate and the bobbin holder. Replace the needle with the master needle and tighten the needle clamp screw. 4. Loosen the setscrews A (2 pcs.) and move the presser bar base plate in the direction of the arrows (B or C). * Move the presser bar base plate in the direction of B when the clearance is too large. * Move the presser bar base plate in the direction of C when the clearance it too small. Adjust the clearance betweeen the needle and hook betweeen -0.10 to +0.05 mm. Tighten the setscrews. * The edge of presser bar base plate should always touches the bosses while adjusting the clearance it. 5. Attach the bobbin holder and needle plate. Attach the face cover. NOTE: Be sure that the clearance between the needle drop position and the edge of needle should be 0.2 mm more for both sides (Refer to page 9). Setscrew Needle plate Bobbin holder Direction C Setscrew A Direction B Boss Needle clamp screw Master needle Tip of hook –0.10 to +0.05 mm... -
Page 15: Feed Dog Height
MECHANICAL ADJUSTMENT FEED DOG HEIGHT The highest position of the feed dog should be 0.80 to 0.95 mm from the surface of the needle plate. To check: 1. Lower the presser foot. 2. Turn the handwheel toward you to raise the feed dog at its highest position. The distance between the feed dog and the upper surface of the needle plate should be 0.80 to 0.95 mm. If it is not in the range, adjust as follows. To adjust: 3. Loosen the screw A. 4. Turn the handwheel to bring the feed dog to its highest position. 5. If the feed dog height is lower than 0.80 mm: turn adjusting screw B in the direction of C. 6. If the feed dog height is heigher than 0.95 mm: turn the adjusting screw B in the direction of D. 7. Tighten the screw A Upper surface of the needle plate 0.80 to 0.95 mm... -
Page 16: Backlash Between Hook Gear And Lower Shaft Gear
MECHANICAL ADJUSTMENT BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR The rotary play of the hook point should be 0.8 mm or less when it is in between the span of the feed dog teeth, and the gears should turn smoothly. 1. Remove the needle plate and bobbin holder. 2. Remove the bed cover (Refer to page 5). 3. Loosen the setscrew A. * If the rotary play is too large, turn the lower shaft bussing in the direction of B. * If the rotary play is too small, turn the lower shaft bussing in the direction of C. 4. Tighten the setscrew A. 5. Attach the front cover. 6. Attach the bobbin holder and needle plate. Setscrew Span of feed dogs Needle plate Hook point 0.8 mm or less Bobbin holder Setscrew A Notch Lower shaft bushing... -
Page 17: Top Tension
MECHANICAL ADJUSTMENT TOP TENSION The top tension should be between 75 to 90 gf when pulling the thread (polyester sewing thread #50 (white)) up in the direction of arrow (Make sure the the foot is lowered) with the tension dial at “4”. If the tension is out of the range, adjust as follows: 1. Remove the front cover (Refer to page 6). 2. Set the tension dial at “4”. 3. After threading the upper thread, lower the presser foot. • If the top tension is too tight, turn the lead screw in the direction A. • If the top tension is too loose, turn the lead screw in the direction B. 4. Check the top tension and attach the front cover. Pull the thread at the speed of 110 mm/sec in the direction of arrow. Polyester sewing thread #50 (white) -
Page 18: Stretch Stitch Feed Balance
MECHANICAL ADJUSTMENT STRETCH STITCH FEED BALANCE To check: 1. Turn the power switch on. Be sure the feed balancing dial is set at standard position as shown below. 2. Select the triple stitch “ ” (stitch pattern #05). 3. Sew the 15 pieces of triple stitch as shown below. Be sure that the total stitch length from the 3rd piece to 13th piece is within the range of 25 to 27 mm. If not, adjust as follows; To adjust: 4. Remove the cap. • Turn the hexagonal socket screw in the direction of (A) if the total length of 10 pieces of the triple stitch pattern is shorter than 25 mm. • Turn the hexagonal socket screw in the direction of (B) if the total length of 10 pieces of the triple stitch pattern is longer than 27 mm. 5. Sew the triple stitch 15 pieces again after the adujsutment. Be sure that the total stitch length from the 3rd piece to 13th piece is within the range of 25 to 27 mm. Attach the cap. Turn the power switch on. The LED display will Press the stitch length Press the start/stop indicate “ 1”. adjusting key 4 times to button. display the “05”. Feed balancing dial (Standard position) 25 to 27 mm Hexagonal socket screw Sew the triple stitch 15 pieces again after... -
Page 19: 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 and adjust the part as follows: TO CHANGE THE THREADER PLATE: 1. Push down the needle threader knob and pull the threader plate supporter down to remove it (see FIG 1). 2. To install the needle threader plate, line the groove up with the pin and push it up to snap fit. TO ADJUST THE THREADER PLATE POSITION: 3. If the hook on the threader positioning plate touches the top or bottom side of the needle hole, loosen hexagonal socket screw and adjust the hook position (FIG.2). -
Page 20: Self-Diagnostic Test
SELF-DIAGNOSTIC TEST Preparation: 1. Turn the power switch off. 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. Turn the hand wheel toward you to raise the needle to its highest position. NOTE: • Be careful: the sewing machine may start running in its own while in test mode. • Turn off the power switch before replacing any parts. • Repeat the diagnostic test until the problem has been resolved. To begin: Turn on the switch. If any of the following problems occur, take the recommended actions in the order they are shown. 1. The machine does not respond when the power switch is turned on: • Check each connector connection. • Replace the switching regulator (with the machine socket). • Replace the printed circuit board A. 2. The sewing machine lamp does not light up: • Be sure all connectors are connected to the circuit board L and A properly (Refer to page 23). • Replace the printed circuit board L. • Replace the printed circuit board A. TO ENTER SELF-DIAGNOSTIC MODE: 1. Turn the power switch on while 2. The LED display 3. Press the MODE key simultaneously pressing auto-lock will indicate “ 1”. to enter the button and needle up/down button. - Page 21 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE CORRECT CONDITION DEFECTIVE CONDITION ITEMS T CHECK Turn on the power switch while Sewing lamp and LED backlight lit. LED Sewing lamp does not lit. FUNCTION OF displays “ 1”. LED backlight does not lit. simultaneously pressing the LED, BUZZER Press the MODE key. LED does not display. auto-lock button and needle up/ AND LAMP Buzzer does not sound. down button. LED does not turned on. Press the MODE key to enter the LED does not display any self-diagnostic mode. symbols or not in order. –REMEDY– If the result is correct condition, Buzzer sounds.
- Page 22 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE CORRECT CONDITION DEFECTIVE CONDITION ITEMS TO CHECK LED displays “5 ”. Buzzer does not sound. Turn the handwheel toward you. UPPER SHAFT Lower the needle bar from its Stitch width or length POSITIONING symbol does not appear. highest to lowest position. SENSOR Raise the needle bar from its –REMEDY– lowest position to highest Replace the circuit board A. position. Turn the handwheel. LED displays the top bar symbol If the result is correct condition, when the needle bar is at zigzag press the MODE key to proceed phase. the next step. Top bar If the result is defective condition, symbol press the reverse stitch button to proceed the next step. LED displays needle lowest position symbol when the needle bar is at feed phase.
- Page 23 SELF-DIAGNOSTIC TEST STEP AND PROCEDURE ITEMS TO CORRECT CONDITION DEFECTIVE CONDITION CHECK Attach the foot control to the LED displays “7 ”. The foot control symbol FOOT machine. does not appear. CONTROL Depress the foot control as far as Buzzer does not sound. it goes, then release it. –REMEDY– Replace the foot control. If the result is correct condition, Replace the switching press the MODE key to proceed The “7F” appears when the foot regulator (foot control the next step. control is attached. socket). Replace the circuit board A. If the result is defective condition, press the reverse stitch button to proceed the next step. Buzzer sounds when the foot control is deeply depressed. Buzzer sounds when the foot control is released. Shift the slide volume from left to LED displays “8 ”.
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Page 24: To Display The Version Of The Program
SELF-DIAGNOSTIC TEST Buzzer sounds after few seconds when the self-diagnostic test has been finished. The test result has been determined. CORRECT: Buzzer sounds and LED displays “ 0” DEFECTIVE: Caution buzzer sounds and LED displays the defective part number. Refer to pages 19 to 21 and fix the defective part. Each time you press the MODE key, the defective part number(s) will be displayed. The defective part number. Refer to pages 19 to 21 “Steps and items” section. Press the reverse stitch button to return to 01. Turn the power switch off when the self-diagnostic test is finished. TO DISPLAY THE VERSION OF THE PROGRAM 1. Turn the power switch on 2. The LED display 3. Press the value set 4. Press the MODE while simultaneously will indicate “ 1”. key once to display key to display the pressing auto-lock button the “ 2”. version of program. and needle up/down button. 5. Each time you press the MODE key, the version number will be partially displayed in sequence. Example: 805A-1-1.00-008... -
Page 25: Replacing The Electronic Components
REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD A CONNECTION NOTE: Do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord. Presser foot lifter switch (Green) (Not applicable for this machine) Foot contorol (Black) Zigzag width motor (Green) Bobbin winder switch (Blue) Connector for writing program (Not used normally.) (White) Switching ragulator (White) Printed circuit board L (White) ErP switch (Red) Printed circuit board P (Black) -
Page 26: Printed Circuit Board A
REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD A TO REMOVE: 1. Remove the front cover. (Refer to page 6.) 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrews (4 pcs.) and the printed circuit board A. TO ATTACH: 4. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord. Setscrew Setscrew Setscrew Setscrew Printed circuit board L Printed circuit board A... -
Page 27: Printed Circuit Board L
REPLACING THE ELECTRONIC COMPONENTS PRINTED CIRCUIT BOARD L TO REMOVE: 1. Remove the front cover. (Refer to page 6.) 2. Pull out connectors from the printed circuit board A. 3. Remove the setscrew and LED cover. 4. Remove the snap rings CS (2 pcs.). 5. Remove the printed circuit board L. TO ATTACH: 6. Follow the above procedures in reverse. NOTE: Do not disconnect the connectors by pulling on cord. To disconnect, grasp the connector, not the cord. Snap ring CS Connector (White) Setscrew Printed circuit board L in LED cover... -
Page 28: Driving Motor (Dc Motor)
REPLACING THE ELECTRONIC COMPONENTS DRIVING MOTOR (DC MOTOR) TO REMOVE: 1. Remove the front cover. (Refer to page 6.) 2. Remove the setscrews (2 pcs.) and the driving motor and the belt. TO ATTACH: 3. Install the driving motor and the motor belt. Tighten them with setscrews (2 pcs.) lightly. 4. Move the motor up or down to adjust the motor belt tension. The belt should deflect 7 to 9 mm when applying 300 grams-force of load to the middle of the belt. Tighten the setscrews (2 pcs.) firmly. 5. Attach the front cover. Setscrew Belt 300 gf pressure 7 to 9 mm DC motor (unit) Setscrew... -
Page 29: Switching Regulator Unit
REPLACING THE ELECTRONIC COMPONENTS SWITCHING REGULATOR UNIT TO REMOVE: 1. Remove the front cover and the rear cover. (Refer to pages 6 and 7.) 2. Remove the setscrews (3 pcs.) and the switching regulator with cords. TO ATTACH: 3. Follow the above procedures in reverse. Be sure to connect the connectors (switching regulator connector (white) and ErP switch connector (Red)) to the circuit board A (Refer to page 23). * ErP switch (Red) is only for the applicable model. Switching regulator Setscrew Setscrew Setscrew...