ELNA 7100 Servicing Manual
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ELNA 7100 Servicing Manual

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Servicing Manual

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Summary of Contents for ELNA 7100

  • Page 1 Servicing Manual...

  • Page 2: Table Of Contents

    Table of Contents Replacing the External Parts Face plate ..................... 1 Top Cover ...................... 1 Belt Cover ..................... 1 Motor Cover ....................1 Base ......................1 Mechanical Adjustment Needle Bar Height ..................2 Presser Bar Height ..................2 Feed Dog Height ................... 3 Feed Dog Alignment ..................

  • Page 3: Replacing The External Parts

    Replacing the External Parts To remove: 1. Face Plate Remove the setscrew (4 x 10) q and washer w. Remove the face plate e. 2. Top Cover Remove the 2 setscrews (4 x 25) r. Lift the top cover t and pull out the motor connector y.

  • Page 4: Mechanical Adjustment

    Mechanical Adjustment 1. Needle Bar Height z Remove the face plate. x Turn the handwheel to bring the needle bar q to the lowest position. v Loosen the setscrew w. Move the needle bar q up or down and match the upper hairline e with the bottom edge of the needle bar bushing r.

  • Page 5: Feed Dog Height

    3. Feed Dog Height When the feed dog is fully raised the height should be 0.8–1.0 mm above the needle plate. 0.8–1.0 mm z Set the stitch length dial at 6 (Maximum). Turn the handwheel to bring the feed dog to the highest position.

  • Page 6: Feed Cam Timing

    5. Feed Cam Timing To Check: z Lower the needle bar by turning the handwheel until the point of the needle is 17.5 mm above the upper surface of the needle plate q. x The feed dogs should not move when moving the reverse stitch lever up and down.

  • Page 7: Feed Lifting Cam Timing

    6. Feed Lifting Cam Timing To check: z Lower the needle bar until the point of needle is level with the upper surface of the needle plate q 0.4 mm below the needle plate . 0.4 mm x The top of the feed dogs w should be 0–0.1 mm above the needle plate.

  • Page 8: Needle To Hook Timing

    7. Needle to Hook Timing z Remove the needle plate. x Loosen the 3 setscrews q. Pull out the hook race very slightly (less than 0.5 mm). c Raise the needle bar from the lowest position until the lower heirline w of the needle bar matches the edge of the needle bar bushing e.

  • Page 9: Hook Stopper Position

    9. Hook Stopper Position z Remove the needle plate and base. x Loosen the setscrew q and move the hook stopper w so that the center of the needle e is located between the center of th hook stopper r and outer side of the hook stopper spring t.

  • Page 10: Bobbin Winder Stopper

    10. Bobbin Winder Stopper The amount of thread wound on the bobbin should be 16.5–19.5 mm in diameter. z Loosen the setscrew q. Turn the bobbin winder stopper w to adjust the thread amount. • If the amount is too mauch, turn the stopper in the direction A.

  • Page 11: Check Spring Stroke

    11. Check Spring Stroke The amount of the needle thread supplied by the check spring should be 11–15 mm. z Thread the machine up to the thread guide q and lower the presser foot. Lower the needle bar to the lowest position. x Hold the thread end and mark the point w on the thread beside the thread guide.

  • Page 12: Knee Lifter Lever

    13. Knee Lifter Lever The presser foot rises 7.5 mm when it is fully raised with the knee lifter. z Remove the base and lay the machine on its back. x Loosen the nut q on the knee lifter lever w slightly and turn the adjusting screw e to adjust the height.

  • Page 13: Needle Stop Position

    14. Needle Stop Position z Turn the power switch q on while pressing the Up/ Down needle position button w and bobbin winding button e at the same time. x Remove the top cover. c Lower the needle bar by turning the handwheel until the needle point is 18.7 mm above the upper surface of the needle plate r.

  • Page 14: Needle Threader

    15. Needle Threader To remove: z Remove the face plate. x Pull the threader q out from the threader shaft w. To attach: v Align the groove e of the theader with the pin r on the threader shaft. Push the threader up until it snaps in place.

  • Page 15: Replacing The Electronic Components

    Replacing the Electronic Components 1. Location of the Electronic Components Slide volume Bobbin winder motor Bobbin winder switch Circuit board-A Circuit board-F Upper shaft sensor Driving motor Lamp Machine socket Thread cutter switch Capacitor Push-pull solenoid Power transformer Circuit borad-MS Arm lamp...

  • Page 16: Location Of The Connectors

    2. Location of the Connectors Thread cutter switch* Power transformer Motor sensor (primary) Machine socket (primary) Circuit borad-F Upper shaft sensor Capacitor* Push-pull solenoid* Bobbin winder switch Lamp Power transformer Arm lamp Driving motor Machine socket (secondary) (secondary) Slide volume...

  • Page 17: Internal Wiring

    3. Internal Wiring To prevent the internal wirings from contacting the moving parts or being caught in the joint of the external parts, the internal wirings should properly be routed and secured as illustrated. Motor cord Motor sensor cord Machine socket cord (primary) Machine socket cord (secondary) Cord binder Push-pull solenoid cord*...

  • Page 18: Circuit Board-A

    4. Circuit Board-A To remove: z Remove the top cover. x Pull out connectors from the circuit board-A. Remove the cords from the cord clips q. c Remove the setscrews w and the board-A case lid e. v Pull out the connectors under the case lid. Remove setscrews r and circuit board-A.

  • Page 19: Driving Motor

    6. Driving Motor To remove: z Remove the belt cover and motor cover. x Pull out the motor sensor connector q. c Pull out the motor connector w, while pushing the connector lock e. v Remove the nuts r and driving motor t. NOTE: Do not disconnect the connectors by pulling on cord.
  • Page 20 6. Driving Motor (continued) To attach: z Install the driving motor q to the motor bracket w and attach the motor belt e. Tighten the nuts r firmly. x Loosen the setscrews t slightly and move the motor up or down to adjust the motor belt tension. The belt should deflect 4–5 mm when applying 300 grams of load to the middle of the belt.

  • Page 21: Power Transformer

    7. Power Transformer z Remove the top cover and motor cover. x Remove the board-A case lid and pull out the transformer connectors (primary and secondary) from the circuit board-A. c Remove the driving motor. v Remove the setscrew q and cord binder w. b Remove the setscrews e and transformer r.

  • Page 22: Light Bulb

    9. Light Bulb Light bulb inside of the face plate z Remove the face plate q. x Pull out the light bulb w from the lamp socket e. c Insert a new bulb and push it into the lamp socket. v Attach the face plate.

  • Page 23: Adjustment Of The Thread Cutter Mechanism

    Adjustment of the Thread Cutter Mechanism 1. Static Cutter Blade z Remove the needle plate and base. x Lower the needle bar to the lowest position. Turn the handwheel toward you while pushing up the link body q to engage the thread cutter blade w and bring it under the static blade e.

  • Page 24: Thread Cutter Blade

    2. Thread Cutter Blade To replace: z Remove the needle plate and base. x Remove the static cutter blade. Remove the hinge screw q and thread cutter balde w. c Attach the new thread cutter balde and secure it with the hinge screw q.

  • Page 25: Thread Guide Plate

    3. Thread Guide Plate z Remove the needle plate. x Loosen the flat screw q and adjust the position of the thread guide plate w. c The left inner edge e of the thread guide plate should be approximately 1.4 mm from the center of the needle drop position r and the back inner edge t of 2.7 mm the thread guide plate should be approximately...

  • Page 26: Needle To Cutter Cam Timing

    4. Needle to Cutter Cam Timing z Remove the base. x Remove the setscrews q and gear cover w. c Lower the needle bar to the lowest position. Turn the handwheel toward you to raise the needle bar while pusging up the link body e. 10.5 mm v Continue to turn the handwheel until the thread drawing arm r starts to move to the right.

  • Page 27: Thread Drawing Lever

    5. Thread Drawing Lever z Remove the base. x Loosen the setscrew q and free the stopper w. c Turn the the handwheel toward you to raise the needle bar from the lowest position until the needle point is 10.5 mm above the upper surface of the needle plate.

  • Page 28: Auto Tension Release

    6. Auto Tension Release z Turn the handwheel toward you to raise the needle bar until the needle point is just above the needle 1 mm plate. x Set the tension dial at 4 and push the solenoid disk q fully to the right.

  • Page 29: Thread Cutter Troubleshooting

    Thread Cutter Troubleshooting The needle thread is not cut. The static cutter is dull. Replace or grind the static cutter blade. The static cutter blade is Adjust the position of the static cutter blade (see page 21). out of position. Skipped stitch before Reset the needle at the proper angle.

  • Page 30: Parts List

    7100...
  • Page 31 7100 Part number Description Top cover (unit) 767603708 Top cover 767007407 Handle 846015004 846016005 Setscrew 4X6 000115205 Foot pressure adjusting dial 767008006 Snap ring CS-22 000015101 Thread guide (unit) 767639002 Adjustable lock nut 000160102 Top cover thread guide 846021003 Pre-tension (unit)
  • Page 32 7100...
  • Page 33 7100 Part number Description Belt cover (unit) 767605009 Belt cover 767011105 Stitch length window 767014108 Thread guide (unit) 767636009 Thread guide post 784177000 Thread guide bar 767015006 TP screw 4X10 000115700 Setscrew 4 X 12 000170507 Motor cover 767010001 Setscrew 4 X 16...
  • Page 34 7100...
  • Page 35 7100 Part number Description 767601108 Ornamental plate (unit) 767003207 Ornamental plate 767004105 Button 1 767501004 Printed circuit board F (unit) 000120203 Setscrew 3 X 8 767140001 Speed control slider 767516002 Slide volume 767229005 Emblem 000014306 Snap ring CS 3 000115205...
  • Page 36 7100...
  • Page 37 7100 Part Number Description Presser bar lifter 767026000 Presser bar bracket 767027001 Hexagonal socket screw 5 X 5 000111304 Presser bar spring 846037002 Presser bar 767028002 Presser spring 767029003 Foot pressure indicator 767030100 Foot pressure adjusting screw 767031008 Spacer 767173003...
  • Page 38 7100...
  • Page 39 7100 Part Number Description 767271002 Upper shaft shield plate 820102009 Washer 000103509 Setscrew 4 X 10 767195012 Belt wheel 000111304 Hexagonal socket screw 5X5 767139007 Handwheel‘ 556047007 Washer 618070004 Setscrew 767618005 Idler (unit) 000002806 Snap ring E6 000115504 TP screw 5 X 10...
  • Page 40 7100...
  • Page 41 7100 Part Number Description 761510101 Hook race (unit) 767510006 Bobbin case (unit) 761094115 Bobbin 767518004 Hook race stopper (unit) 767079008 Hook race stopper 767201001 Hook race stopper spring 000169709 Setscrew 2 X 2.3 000081005 Setscrew 4 X 8 767698102 Hook race shaft (unit)
  • Page 42 7100...
  • Page 43 7100 Description Part Number 767089001 Feed lifting cam 000111304 Hexagonal socket screw 5 X 5 767620000 Feed link (unit) 000002909 Snap ring E-7 000002507 Snap ring E-4 000114802 TP screw 4 X 12 767619109 Feed base (unit) (1) 767621104 Feed base (unit) (2)
  • Page 44 7100...
  • Page 45 7100 Part Number Description 767663005 Feed regulator (unit) 767100009 Feed adjusting arm 000218106 Bolt 5 X 16 767101000 000001609 Snap ring E-5 767102001 Feed link 767106005 000111304 Hexagonal socket screw 5 X 5 767157001 Washer 767664006 Feed cam (unit) 767107006...
  • Page 46 7100...
  • Page 47 7100 Part Number Description 767642008 Knee lifter lever (1) (unit) 767057000 Knee lifter lever (1) 000196107 Hexagonal socket screw 5 X 20 (Ball point) 000061412 767058001 Knee lifter shaft 000030009 Snap ring E-10 767059002 Shaft 767060006 Knee lifter lever (2)
  • Page 48 7100...
  • Page 49 7100 Part Number Description 820832005 Large screwdriver 647803004 Small screwdriver 761094115 Bobbin 200100801 Cloth guide 825252000 Thumb screw 761172004 Hemmer foot 822020503 Spool cap 784223105 Spool holder 624806006 767802008 Assorted needle set 802424004 Lint brush 846811008 Knee lifter (unit) 770816005...

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