Janome DC3018 Service Manual
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Janome DC3018 Service Manual

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SERVICING MANUAL
DC3018 & DC3050

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Summary of Contents for Janome DC3018

  • Page 1 SERVICING MANUAL DC3018 & DC3050...

  • Page 2: Table Of Contents

    CONTENTS WHAT TO DO WHEN ........................1 - 3 FACE COVER ............................4 BED COVER ............................5 FRONT COVER ..........................6 - 7 REAR COVER ............................8 PRESSER BAR HEIGHT AND ALIGNMENT ..................9 NEEDLE DROP POSITION ......................... 10 NEEDLE BAR HEIGHT ........................11 NEEDLE TO HOOK TIMING ........................

  • Page 3: What To Do When

    WHAT TO DO WHEN CONDITION CAUSE HOW TO FIX REFERENCE 1. SKIPPING 1. NEEDLE IS NOT INSERTED INSERT THE NEEDLE PROPERLY. STITCHES PROPERLY. 2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE. 3. INCORRECTLY THREADED. RETHREAD. 4. NEEDLE OR THREAD ARE USE THE RECOMMENDED INAPPROPRIATE FOR SEWING NEEDLE AND THREAD.
  • Page 4 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.
  • Page 5 CONDITION CAUSE HOW TO FIX REFERENCE 6. NOISY 1. BACKLASH BETWEEN SHTTLE SEE MECHANICAL ADJUSTMENT P. 14 OPERATION HOOK GEAR AND LOWER “BACKLASH (LOWER SHAFT GEAR)”. SHAFT GEAR IS TOO GREAT. 2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS. LOOSE. 3.

  • Page 6: Face Cover

    SERVICE ACCESS (1) FACE COVER TO REMOVE: 1. REMOVE THE CAP (A). 2. REMOVE THE SETSCREW (B) AND REMOVE THE FACE COVER (C). TO INSTALL: 3. INSERT THE HOOK (D) AND RIBS (E) OF THE FACE COVER INTO THE REAR COVER AND TIGHTEN THE SETSCREW, THEN ATTACH THE CAP.

  • Page 7: Bed Cover

    SERVICE ACCESS (2) BED COVER TO REMOVE: 1. SET THE DROP LEVER (A) TO THE LEFT AND REMOVE THE 3 SETSCREWS (B). REMOVE THE BED COVER (C). TO INSTALL: 2. SET THE DROP LEVER (A) TO THE LEFT AND INSTALL THE BED COVER (C). SECURE IT IN PLACE WITH THE 3 SETSCREWS (B).

  • Page 8: Front Cover

    SERVICE ACCESS (3-1) FRONT COVER TO REMOVE: 1. REMOVE THE FACE COVER AND BED COVER (SEE PAGES 7 AND 8). 2. LOOSEN THE SETSCREWS (A), THEN REMOVE THE SETSCREWS (B), (C), (D), (E), (F), (G) AND (H). 3. REMOVE THE FRONT COVER (SEE PAGE 10) AND DISCONNECT EACH SWITCH CONNECTORS. NOTES TO DISCONNECT THE CONNECTORS: 1.

  • Page 9: Front Cover

    SERVICE ACCESS (3-2) FRONT COVER 1. UNFASTEN THE FRONT AND REAR COVER HOOKS AND THE BOTTOM SIDE HOOK AS SHOWN. 2. PULL THE FRONT COVER TO CLEAR OF THE FEED BALANCING KNOB. 3. PULL THE FRONT COVER TO CLEAR OF THE MACHINE SOCKET AND REMOVE THE FRONT COVER. * REMOVE THE SETSCREWS (F) AND (G) ON THE REAR COVER TO FACILITATE CLEARANCE OF THE FRONT COVER FROM THE MACHINE SOCKET.

  • Page 10: Rear Cover

    SERVICE ACCESS (4) REAR COVER TO REMOVE: 1. REMOVE THE FRONT COVER (SEE PAGE 6 AND 7). 2. REMOVE SETSCREWS (A), (B) AND (C), THEN 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. 1.REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.

  • Page 15: Needle Clearance To Shuttle

    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 (D). 2.

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

    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. ADJUSTMENT: 1.

  • Page 17: Feed Dog Height

    MECHANICAL ADJUSTMENT 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. 1. SET THE PRESSURE DIAL AT "3" AND LOWER THE PRESSER FOOT. 2.

  • 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 (REFER TO PAGE 6-7). 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

    MECHANICAL ADJUSTMENT NEEDLE THREAD TENSION THE STANDARD TENSION SHOULD BE 75 TO 90 GRAMS WHEN THE TENSION DIAL IS SET AT "A" (AUTO), 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

    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 21: Replacement And Adjustment Of Needle Threader Plate

    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 Connection 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 23: Replacing The Printed Circuit Board "A

    REPLACING PRINTED CIRCUIT BOARD A TO REMOVE: 1. REMOVE THE FRONT COVER (SEE PAGE 9 ~ 10). 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 24: Replacing The 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 6~7). 2. UNPLUG THE SLIDE VOLUME CONNECTOR. 3. REMOVE THE FOUR CS RING (A) AND REMOVE THE SIDE VOLUME. TO INSTALL: 4.

  • Page 25: Replacing The Dc Motor And Adjusting The Motor Belt Tension

    REPLACING DS MOTOR AND ADJUSTING MOTOR BELT TENSION TO REMOVE: 1. REMOVE THE FRONT AND REAR COVERS (SEE PAGE 6~8). 2. REMOVE THE TWO SETSCREWS, THEN REMOVE THE DC MOTOR AND BELT. TO INSTALL: 3. LIGHTLY TIGHTEN THE TWO SCREWS. 4.

  • Page 26: Replacing The Fuse

    REPLACING THE FUSES REPLACING THE FUSES TO REMOVE: 1. REMOVE THE FRONT COVER (SEE PAGE 6~7). 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 27: Replacing The Machine Socket

    REPLACING MACHINE SOCKET (UNIT) REPLACING THE MACHINE SOCKET TO REMOVE: 1. REMOVE THE FRONT AND REAR COVER (SEE PAGE 6 ~ 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. 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 28: Replacing The Transformer

    REPLACING THE TRANSFORMER REPLACING THE TRANSFORMER TO REMOVE: 1. REMOVE THE FRONT COVER (SEE PAGE 6~7). 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 1.

  • Page 29: Replacding The Zigzag Motor

    REPLACING THE ZIGZAG WIDTH MOTOR REPLACING THE ZIGZAG WIDTH MOTOR TO REMOVE: REMOVE THE FRONT AND REAR COVER (SEE PAGE 9~11). 2. REMOVE THE TWO SETSCREWS AND REMOVE THE ZIGZAG WIDTH MOTOR PROTECTOR PLATE. CUT OFF THE BINDER. 3. REMOVE THE TWO ZIGZAG ROD SETSCREWS. 4.

  • Page 30: 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 9~11). 2. REMOVE THE SNAP RING (E-3). 3. REMOVE THE TWO SETSCREWS AND REMOVE THE FEED MOTOR. CUT OFF THE CORD BINDER. TO INSTALL: 4.

  • Page 31: Adjusting The Buttonhole Lever

    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 32: Adjusting The Bobbin Winder Switch

    ADJUSTING THE BOBBIN WINDER SWITCH TO ADJUST THE BOBBIN WINDING SWITCH 1. REMOVE THE FRONT COVER (SEE PAGE 6 - 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 33: 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.

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