Janome 7330 Servicing Manual
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Janome 7330 Servicing Manual

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Servicing Manual
Model 7330

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Summary of Contents for Janome 7330

  • Page 1 Servicing Manual Model 7330...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS WHAT TO DO WHEN ....................1-3 SERVICE ACCESS (1) FACE COVER, TOP COVER ..........4 SERVICE ACCESS (2) BASE, BED COVER ..............5 SERVICE ACCESS (3) BELT COVER ................6 SERVICE ACCESS (4) FRONT COVER ..............7 SERVICE ACCESS (5) REAR COVER .................

  • Page 3: What To Do When

    7330 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...
  • Page 4 7330 CONDITION CAUSE HOW TO FIX REFERENCE 3. Breaking 1. Initial sewing speed is too fast. Start with medium speed. upper thread 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle.
  • Page 5 7330 CONDITION CAUSE HOW TO FIX REFERENCE 6. Noisy 1. Backlash between shttle hook See mechanical adjustment p. 14 operation gear and lower shaft gear is too “Backlash (lower shaft gear)”. great. 2. Lower shaft gear is loose. Eliminate the looseness.

  • Page 6: Service Access (1) Face Cover, Top Cover

    7330 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.

  • Page 7: Service Access (2) Base, Bed Cover

    7330 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.

  • Page 8: Service Access (3) Belt Cover

    7330 SERVICE ACCESS (3) BELT COVER TO REMOVE: 1. Remove the setscrew (A), (B), and remove the belt cover. TO INSTALL: 2. Install the belt cover with the setscrew (A) and (B). Setscrew (A) Belt cover Setscrew (B)
  • Page 9 7330 SERVICE ACCESS (4) FRONT COVER TO REMOVE: 1. Remove the top cover and belt cover (see pages 4 and 6). 2. Loosen the setscrews (A), (B), (C), (D) and (E), then remove the setscrew (F). 3. Disconnect each switch connectors of printed circuit board "A".

  • Page 10: Service Access (5) Rear Cover

    7330 SERVICE ACCESS (5) REAR COVER TO REMOVE: 1. Remove the top cover and belt cover (see pages 4 and 6). 2. Loosen the setscrews (A), (B), (C), and (D), then remove the setscrew (E). * To remove the cover, detach the presser foot lifter section first, with the presser foot lifter in the down position.

  • Page 11: Mechanical Adjustment

    7330 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

    7330 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 To Shuttle Timing

    7330 MECHANICAL ADJUSTMENT NEEDLE TO SHUTTLE 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 14: Needle Bar Height

    7330 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 15: Needle Clearance To Shuttle

    7330 MECHANICAL ADJUSTMENT NEEDLE CLEARANCE TO SHUTTLE 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).

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

    7330 MECHANICAL ADJUSTMENT BACKLASH (BETWEEN LOWER SHAFT GEAR AND SHUTTLE 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 wodth. If play excess 0.8 mm, adjust as follows.

  • Page 17: Feed Dog Height

    7330 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 raised.

  • Page 18: Zigzag Synchronization

    7330 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 (refer to page 7). 2. Turn on the power switch, select the pattern no. 2 and set the machine at the maximum zigzag width.

  • Page 19: Needle Thread Tension

    7330 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 20: Stretch Stitch Feed Balance

    7330 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 "...

  • Page 21: Replacement And Adjustment Of The Needle Threader Plate

    7330 MECHANICAL ADJUSTMENT REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE If the hook of the threader plate is damaged, change or 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).

  • Page 22: Connector Diagram

    7330 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.

  • Page 23: Self Diagnostic Tests

    7330 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.

  • Page 24: Self Diagnostic Sheet

    7330 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-segment led tic mode.
  • Page 25 7330 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 26 7330 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.
  • Page 27 7330 STEP CORECT CONDITION DEFECTIVE CONDITION OPERATION 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.

  • Page 28: Replacing Printed Circuit Board A

    7330 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.

  • Page 29: Replacing Slide Volume And Printed Circuit Board F

    7330 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.

  • Page 30: Replacing Dc Motor And Adjusting Motor Belt Tension

    7330 REPLACING DS 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.

  • Page 31: Replacing The Fuses

    7330 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).

  • Page 32: Replacing Machine Socket (Unit)

    7330 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 screws and remove the machine socket. TO INSTALL: 3. To install the machine socket, follow the above procedure in reverse.

  • Page 33: Replacing The Transformer

    7330 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.

  • Page 34: Replacing The Zigzag Width Motor

    7330 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. 3. Remove the two setscrews and remove the zigzag width motor.

  • Page 35: Replacing The Feed Stitch Motor

    7330 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.

  • Page 36: Adjusting Buttonhole Lever Position

    7330 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 37: Adjusting The Bobbin Winder Switch

    7330 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.

  • Page 38: Oiling

    7330 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.

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