Janome Skyline s7 Service Manual
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Janome Skyline s7 Service Manual

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First Edition: 7 August 2015
SERVICE MANUAL
SKYLINE S7

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Summary of Contents for Janome Skyline s7

  • Page 1 First Edition: 7 August 2015 SERVICE MANUAL SKYLINE S7...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Replacing external parts Face cover ................................1 Belt cover ................................1 Top cover ................................2 Machine base ..............................3 Base cover ................................3 Bed cover ................................3 Free arm cover ..............................4 Front cover ................................5 Rear cover ................................6 Replacing mechanical parts Needle threader hook ............................7 Replacing electronic components Printed circuit board A ............................8 Printed circuit board F ............................9...

  • Page 3: Replacing External Parts

    Replacing external parts Setscrews A Face cover To remove: 1. Remove the setscrews A. Remove the face cover. To attach: Follow the above procedure in reverse. Belt cover To remove: 1. Remove the cap and setscrew B. Setscrew B 2. Remove the setscrew C. Setscrew C 3.

  • Page 4: Top Cover

    Replacing external parts Setscrew A Top cover To remove: 1. Raise the carrying handle and remove the setscrew A. Face cover Top Cover Carrying handle Bobbin winder spindle 2. Open the top cover. Pull out the flange plate from the bobbin winder spindle.

  • Page 5: Machine Base

    Replacing external parts Machine base To remove: 1. Remove the setscrews A. 2. Remove the machine base. Setscrews A To attach: Follow the above procedure in reverse. Machine base Base cover To remove: 1. Remove the setscrews B. 2. Remove the base cover. Setscrews B To attach: Follow the above procedure in reverse.

  • Page 6: Free Arm Cover

    Replacing external parts Free arm cover Needle plate To remove: 1. Remove the machine base and base cover (see page 3). 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.

  • Page 7: Front Cover

    Replacing external parts Setscrew A Front cover Setscrew A To remove: 1. Remove the top cover, belt cover, base cover, machine base and free arm cover (see pages 1-4). 2. Loosen the setscrews A (underside of the machine). 3. Remove the setscrew B. Setscrew B Setscrew D Setscrew C...

  • Page 8: Rear Cover

    Replacing external parts Setscrew A Rear cover To remove: 1. Lower the presser foot. Remove the belt cover, top cover and base cover (see pages 1-3). 2. Loosen the setscrew A. Setscrew B 3. Loosen the setscrew B 4. Remove the four setscrews C. Setscrew C Hole D 5.

  • Page 9: Replacing Mechanical Parts

    Replacing mechanical parts Needle threader hook To remove: 1. Push down the threader lever as far as it will go and hold it in place. Loosen and remove setscrew. 2. Release the threader lever slowly while holding the threader unit to disengage it from the threader shaft. Threader lever Threader unit Setscrew...

  • Page 10: Replacing Electronic Components

    Replacing electronic components Printed circuit board A Setscrews NOTE: Do not disconnect 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 printed circuit board A.

  • Page 11: Printed Circuit Board F

    Replacing electronic components NOTE: Do not disconnect connectors by pulling on cord. To disconnect the connectors, grasp the connector, not the cord. Printed circuit board F To remove: 1. Remove the front cover (see page 5). 2. Disconnect the printed circuit board F connector from the printed circuit board A (see page 8).

  • Page 12: Switching Power Supply Unit

    Replacing electronic components Switching power supply connector Switching power supply unit To remove: 1. Remove the belt cover, the top cover and the front cover (see pages 1, 2 and 5). 2. Disconnect the switching power supply connector from the switching power supply unit. Setscrews 3.

  • Page 13: Dc Motor

    Replacing electronic components DC motor NOTE: Do not disconnect connectors by pulling on cord. To disconnect the connectors, grasp the connector, not the cord. To remove: 1. Remove the belt cover, the top cover and the front cover (see pages 1, 2 and 5). Motor belt 2.

  • Page 14: Thread Tension Unit

    Replacing electronic components Thread tension unit NOTE: Do not disconnect connectors by pulling on cord. To disconnect the connectors, grasp the connector, not the cord. To remove: 1. Remove the belt cover and the top cover (see page 1 and 2). 2.

  • Page 15: Mechanical Adjustment

    Mechanical adjustment Feed dog height When the foot pressure is set at maximum (AUTO+4) and the presser foot A is lowered, the highest position of the feed dog should be 0.80 to 0.90 mm from the surface of the needle plate. 1.

  • Page 16: 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 17: Clearance Between Needle And Tip Of The 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 18: Clearance Between Needle And Tip Of The Rotary Hook

    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. Setscrew C 1. Remove the bed cover (see page 3). Setscrew A 2.

  • Page 19: Hook Timing

    Mechanical adjustment Hook timing The amount of ascending travel of the needle bar from its lowest position to the position (Needle drop position 0.0) where the tip of the rotary hook exactly meets the right side of the needle should be 3.70 to 4.00 mm. Bobbin holder Hook To adjust: Tip of hook...

  • Page 20: 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 in the needle drop position "0.0" as the needle ascends from its lowest position.

  • Page 21: 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 22: 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.

  • Page 23: 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.

  • Page 24: Tension Release Mechanism

    Mechanical adjustment Tension release mechanism When the presser foot lifter is raised, the tension release mechanism should work correctly. 1. Remove the belt cover and top cover (see pages 1-2). Convex is NOT set at tension release claw 2. Remove the front cover (see page 5). Thread tension gear 3.

  • Page 25: Needle Threader Hook Position

    Mechanical adjustment Needle threader hook position 1. Push down the threader lever and hold it just before the threader hook enters the needle eye. 2. If the threader hook is not aligned vertically with the Stopper needle eye, loosen the setscrew A. Adjust the stopper position so that the hook enters into the needle eye.

  • Page 26: Thread Drawinf 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 – 6.0 1. Remove the presser foot, the needle plate and the Hook race Thread drawing lever bobbin holder.

  • Page 27: 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 page 1-2).
  • Page 28 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 24) before this adjustment. To check: 1 Set the upper feed adjusting dial at “0”.
  • Page 29 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 nee- dle plate. To check: 1 Set the upper feed adjusting dial at “0”. Attach the dual feed foot.

  • Page 30: Buttonhole Lever

    Mechanical adjustment Buttonhole lever 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press “BH Sensor” key. Buttonhole Hexagonal lever guide Buttonhole socket screw 2. Open the face cover. Lower the Buttonhole lever. lever guide Loosen the setscrew on the buttonhole lever guide.

  • Page 31: Thread Cutter

    Mechanical adjustment Thread cutter The distance between the end of thread cutter plate slit and the end 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).

  • Page 32: 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 bar supporter 1.

  • Page 33: Presser Foot Lifter Stopper Position

    Mechanical adjustment Presser foot lifter stopper position (1) The distance between the presser foot spring release base and the presser foot lifter should be in the range of 39.4 mm to 39.8 mm when the presser foot is raised with the presser foot lifter. stopper Presser foot lifter Preparation:...
  • Page 34 Mechanical adjustment Presser foot lifter stopper position (2) 6. Remove the supporter spring. Remove the setscrews H and I. Front bracket Remove the front bracket. Setscrew H Setscrew I Supporter spring Front side of the machine To adjust: Presser foot lifter 1.

  • Page 35: Automatic Presser Foot Lifter Initializing Position

    Mechanical adjustment Automatic presser foot lifter initializing position To adjust: 1. Remove the top cover. 2. Turn the power switch ON while pressing the Start/Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press "Foot Sensor" key. 3.

  • Page 36: 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. The LCD shows the Factory Setting Mode. Press "Foot Up/ Down" key. 2. Attach the foot holder lightly (Do not tighten the thumbscrew.).

  • Page 37: Embroidery Foot Height

    Mechanical adjustment Embroidery foot height The distance 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 (not included in the standard accessories, part number 859816014).

  • Page 38: Stretch Stitch Feed Balance

    Mechanical adjustment Stretch stitch feed 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 adjust: 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button.

  • Page 39: Knee Lifter

    Mechanical adjustment Knee lifter To adjust: 1. Turn the power switch ON while pressing the Start/ Stop button and the Reverse stitch button. The LCD shows the Factory Setting Mode. Press "Knee lifter" key. Knee lifter is free. 2. Attach the knee lifter. Press "MEM1"...

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