Janome JW7630 Service Manual
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Janome JW7630 Service Manual

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SERVICE MANUAL
MODEL: JW7630

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Summary of Contents for Janome JW7630

  • Page 1 SERVICE MANUAL MODEL: JW7630...

  • Page 2: Table Of Contents

    CONTENTS WHAT TO DO WHEN ......................1 - 2 SERVICE ACCESS (1) FACE COVER, TOP COVER ............3 SERVICE ACCESS (2) BASE, BED COVER ................. 4 SERVICE ACCESS (3) FREE ARM COVER ................5 SERVICE ACCESS (4) BELT COVER ................... 6 SERVICE ACCESS (5) FRONT COVER ................

  • 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 4. Breaking 1. Incorrecitly threaded bobbin Thread bobbin holder correctly. bobbin holder. thread 2. Too much thread is around on Adjust the position of stopper. the bobbin. 3. Lint is stuck inside the bobbin Clean the bobbin holder.

  • Page 5: Service Access (1) Face Cover, Top Cover

    SERVICE ACCESS (1) FACE COVER TO REMOVE: 1. Remove the cap. 2. Remove the setscrew (A) and remove the face cover. TO INSTALL: 3. Insert the 2 ribs of the face cover into the rear cover and tighten the setscrew, then attach the cap. TOP COVER TO REMOVE: 1.

  • Page 6: Service Access (2) Base, Bed Cover

    SERVICE ACCESS (2) BASE TO REMOVE: 1. Remove the 4 setscrew (A) and the 2 setscrew (B), remove the base. TO INSTALL: 2. Place the part C (concave part in the illustration) between the base and the arm leg. Install the base with the 4 setscrews (A) and the 2 setscrews. BED COVER TO REMOVE: 1.

  • Page 7: Service Access (3) Free Arm Cover

    SERVICE ACCESS (3) FREE ARM COVER TO REMOVE: 1. Remove setscrew (A) and the needle plate. 2. Remove the bed cover (see page 4). 3. Remove setscrew (B) and the Free-arm cover. TO INSTALL: 4. Follow the above procedure in reverse. Needle plate Setscrew (A) Free arm cover...

  • Page 8: Service Access (4) Belt Cover

    SERVICE ACCESS (4) BELT COVER TO REMOVE: 1. Remove the setscrews (A), (B), and remove the belt cover. TO INSTALL: 2. Install the belt cover with the setscrews (A) and (B). Setscrew (A) Belt cover Setscrew (B)

  • Page 9: Service Access (5)

    SERVICE ACCESS (5) FRONT COVER TO REMOVE: 1. Remove the top cover and belt cover (see pages 3 and 6). 2. Loosen the setscrews (A), (B), (C), (D) and (E), then remove the setscrew (F). 3. Disconnect connectors from printed circuit board "A". NOTES: TO DISCONNECT THE CONNECTORS: Grasp the connector directly with your fingers and pull.

  • Page 10: Service Access (6) Rear Cover

    SERVICE ACCESS (6) REAR COVER TO REMOVE: 1. Remove the top cover and belt cover (see pages 3 and 6). 2. Loosen the setscrews (A), (B), (C), and (D), then remove the setscrew (E). 3. Remove the rear cover. * To remove the cover, detach the presser foot lifter section first, with the presser foot lifter in the down position.

  • Page 11: Presser Bar Height And Alignment

    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 6.0 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 at " "; the standard needle drop position should be at the center of the needle plate hole. When the needle swings in maximum zigzag width " ", the distance between both ends of the needle hole on the needle plate and the needle should be 0.2 mm or more.

  • Page 13: Needle Bar Height

    MECHANICAL ADJUSTMENT NEEDLE BAR HEIGHT The distance between the upper edge of needle eye and the tip of the hook should be in the range of 1.6-2.0 mm when the tip of hook meets the right side of the needle in ascending travel of needle from its left and lowest poosition.

  • Page 14: Needle To Hook Timing

    MECHANICAL ADJUSTMENT NEEDLE TO HOOK TIMING When the machine is set the straight stitch pattern no.2 ( left needle position), the amount of ascending travel of the needle bar from its lowest position to the position where the tip of the hook meets the right side of the needle should be 3.25 - 3.55 mm.

  • Page 15: Needle Clearance To Hook

    MECHANICAL ADJUSTMENT NEEDLE CLEARANCE TO HOOK The clearance between the needle and the tip 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 (B). 2.

  • Page 16: Backlash (Between Lower Shaft Gear And Hook Gear)

    MECHANICAL ADJUSTMENT BACKLASH (BETWEEN LOWER SHAFT GEAR AND HOOK GEAR) Jog the hook race back and forth to check rotary play. The standard play should be 0.8 mm (0.03") or less when the hook point is within the feed dog width. If play exceeds 0.8 mm, adjust as follows.

  • Page 17: Feed Dog Height

    MECHANICAL ADJUSTMENT FEED DOG HEIGHT The highest position of the feed dog should be between 0.8 to 0.9 mm from the surface of the needle plate when the pressure dial is set at "3" and the presser foot is lowered. 1.

  • Page 18: Zigzag Synchronization

    MECHANICAL ADJUSTMENT ZIGZAG SYNCHRONIZATION The needle should start swing between 6.3 to 7.5 mm above the surface of the needle plate when the machine is set for zigzag stitching. 1. Remove the front cover (see page 7). 2. Turn on the power switch, select the zigzag stitch and set the machine at the maximum zigzag width. 3.

  • Page 19: Tension Release Mechanism

    MECHANICAL ADJUSTMENT TENSION RELEASE MECHANISM When the presser foot lifter is raised, the tension disk supporter should move approximately 1 mm. 1. Remove the front cover (see page 7). 2. Lower the presser foot lifter, and set the thread tension dial at "9". Then loosen the set screw (A). 3.

  • Page 20: Needle Thread Tension

    MECHANICAL ADJUSTMENT NEEDLE THREAD TENSION The standard tension should be 75 to 90 grams when the tension dial is set at "4", measured with a #50 white polyester thread being pulled at aproximately 110 mm/sec. If the tension is outside the standard range, adjust as follows: ADJUSTMENT: 1.

  • Page 21: Stretch Stitch Feed Balance

    MECHANICAL ADJUSTMENT STRETCH STITCH FEED BALANCE When a stretch stitch pattern is sewn with the feed balancing dial position set at the standard setting mark " ", the stitch pattern should look like the one marked with a " " (A=B) in the diagram below. If forward and backward feeding is unbalanced (A>B or A<B), adjust as follows.

  • Page 22: 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: 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 23: Connector Diagram

    CONNECTOR DIAGRAM Refer to the diagram for locating the connector posts to which each connectors should be connected. NOTE: TO DISCONNECT THE CONNECTORS: 1. Grasp the connector directly with your fingers and pull. Do not pull the lead wire, as this may damage the contact sleeve inside the connector. 2.

  • Page 24: Self Diagnostic Tests

    SELF DIAGNOSTIC TESTS PREPARATION: * Turn off the power switch. * Shift the bobbin winder spindle to the left. * Raise the feed dog. * Shift the slide volume to the left. * Remove the presser foot and raise the presser foot lifter. * Turn the handwheel toward you to raise the needle to its highest position.

  • Page 25: Self Diagnostic Sheet

    SELF DIAGNOSTIC SHEET DEFECTIVE RESULTS STEP AND CORRECT RESULTS PROCEDURE ITEMS TO CHECK * No beep sound. * Beep sounds when the buttons are Turn on the power switch while * Does not enter self-diagnos- pressed. simultanously pressing the needle up/ 7 - s e g m e n t tic mode.
  • Page 26 OPERATION CORRECT CONDITION DEFECTIVE CONDITION STEP Press needle up/down button, LED LED display is different from displays "06" for one second. that shown to the left. Buttonhole sensor 1. Lower the buttonhole lever. 1. Adjust the buttonhole * When the buttonhole lever sensor position.
  • Page 27 STEP OPERATION CORECT CONDITION DEFECTIVE CONDITION Press needle up/down button, When the speed control lever is at the left, * LED display is different from that LED displays "09" for one second. LED displays "00". shown to the left. Slide Slide the speed control lever volume from the left to the right, then...
  • Page 28 STEP OPERATION CORECT CONDITION DEFECTIVE CONDITION Press needle up/down button, LED * LED indicates "dc". Machine does not run, LED indicates "12" for one swcond. * Machine runs at the speed set by displays "Lo". DC motor * Press foot control. the speed control lever.

  • Page 29: Replacing Printed Circuit Board A

    REPLACING PRINTED CIRCUIT BOARD A TO REMOVE: 1. Remove the front cover (see page 7). 2. Unplug the connectors from the board "A". 3. Remove the 6 screws and remove board "A". NOTE: TO DISCONNECT THE CONNECTORS: 1. Grasp the connector directly with your fingers and pull. Do not pull on the lead wire, as this may damage the contact sleeve inside theconnector.

  • Page 30: Replacing Slide Volume And Printed Circuit Board F

    REPLACING SLIDE VOLUME AND PRINTED CIRCUIT BOARD F REPLACING THE SLIDE VOLUME TO REMOVE: 1. Remove the front cover unit (see page 7). 2. Unplug the slide volume connector. 3. Remove the four CS ring (A) and remove the side volume. TO INSTALL: 4.

  • Page 31: Replacing Dc Motor And Adjusting Motor Belt Tension

    REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION TO REMOVE: 1. Remove the front and rear covers (see page 7 and 8). 2. Remove the two setscrews, then remove the DC motor and belt. TO INSTALL: 3. Lightly tighten the two screws. 4.

  • Page 32: Replacing The Fuses

    REPLACING THE FUSES REPLACING THE FUSES TO REMOVE: 1. Remove the front cover (see page 7). 2. Remove the four setscrews and lift off the cover on printed circuit board "A". 3. Remove the fuse. (Pry it out with a screwdriver). TO INSTALL: 4.

  • Page 33: Replacing The Machine Socket

    REPLACING MACHINE SOCKET (UNIT) REPLACING THE MACHINE SOCKET TO REMOVE: 1. Remove the front and rear cover (see page 7 and 8). 2. Remove the two setscrews and remove the machine socket. TO INSTALL: 3. To install the machine socket, follow the above procedure in reverse. NOTE Pull out the cord in front of the arm to prevent it from contacting with the lower shaft or other moving parts, and secure it to the feed motor cord with a binder.

  • Page 34: Replacing The Transformer

    REPLACING THE TRANSFORMER REPLACING THE TRANSFORMER TO REMOVE: 1. Remove the front cover (see page 7). 2. Remove the two setscrews and remove the transformer. Cut off the binder. TO INSTALL: 3. To install the transformer, follow the above procedure in reverse. NOTE Place the rear end of the transformer on the transformer support.

  • Page 35: Replacing The Zigzag Width Motor

    REPLACING THE ZIGZAG WIDTH MOTOR REPLACING THE ZIGZAG WIDTH MOTOR TO REMOVE: Remove the front and rear cover (see page 7 and 8). 2. Remove the two zigzag rod setscrews (B). 3. Remove the two setscrews (C) and remove the zigzag width motor. TO INSTALL: 4.

  • Page 36: Replacing The Feed Motor

    REPLACING THE FEED STITCH MOTOR REPLACING THE FEED MOTOR TO REMOVE: 1. Remove the front cover and rear covers (see page 7and 8). 2. Remove the snap ring (E-3). 3. Remove the two setscrews and remove the feed motor. TO INSTALL: 4.

  • Page 37: Adjusting Buttonhole Lever Position

    ADJUSTING BUTTONHOLE LEVER POSITION TO ADJUST THE BUTTONHOLE LEVER GUIDE: 1. Set the machine in buttonhole sensor adjusting mode. (See below. The LED should display "H" or "l".) 2. Remove the face cover and loosen setscrew (A). 3. Lower the buttonhole lever. Loosen the setscrew and position the buttonhole lever guide so the LED displays "l" .

  • Page 38: Adjusting The Bobbin Winder Switch

    ADJUSTING THE BOBBIN WINDER SWITCH TO ADJUST THE BOBBIN WINDING SWITCH 1. Remove the front cover (see page 7). 2. Set the bobbin winder arm in the sewing position and loosen the setscrew. Adjust the clearance between the bobbin winder arm and the switch fixing plate to o.7 to 1.3 mm. 3.

  • Page 39: Oiling

    OILING Factory lubricated parts will provide years of household sewing without routine oiling, but you should still check for possible lubrication needs whenever servicing machines. OIL: Use good quality sewing machine oil at the points (A, B, C, D, E, F, G, H, I, J & K) indicated by the black arrows. GREASE: Use white grease such as molycote em-40m at the points (L&...

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