Alfa Network Next 20 Service Manual And Parts List
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Alfa Network Next 20 Service Manual And Parts List

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  • Page 1 SERVICE MANUAL PARTSLIST Next 20...

  • Page 2: Table Of Contents

    CONTENTS WHAT TO DO WHEN ..................1~3 SERVICE ACCESS FACE COVER ..................4 TOP COVER ................... 4 BASE COVER ..................5 REAR COVER ..................6 FRONT COVER ..................7 MECHANICAL ADJUSTMENT NEEDLE THREAD TENSION ..............8 BOBBIN TENSION ................. 9 PRESSER BAR HEIGHT AND ALIGNMENT ........

  • 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 THE 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 USE THE PROPER THREAD INCORRECT. 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 SEE MECHANICAL P.14 OPERATION SHUTTLE HOOK GEAR AND ADJUSTMENT “CLEARANCE LOWER SHAFT GEAR IS TOO BETWEEN NEEDLE AND GREAT. SHUTTLE (NO.2)”. 2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS. LOOSE.

  • Page 6: Service Access

    SERVICE ACCESS FACE COVER FACE COVER SETSCREW(B) CAP(A) TO REMOVE: REMOVE THE FACE COVER BY REMOVING THE CAP (A) AND SETSCREW (B). TO ATTACH: 2. FOLLOW THE ABOVE PROCEDURE IN REVERSE. TOP COVER SETSCREW(C) THREAD GUIDE TO REMOVE: REMOVE THE SETSCREWS (C). SLIDE THE CORNER OF THE TOP COVER SLIGHTLY IN THE DIRECTION OF ARROW.

  • Page 7: Base Cover

    SERVICE ACCESS BASE COVER BASE COVER TO REMOVE: LOOSEN THE SETSCREWS (A). REMOVE THE BASE PLATE. TO ATTACH: MOUNT THE BASE PLATE AND SECURE IT WITH SETSCREWS.

  • Page 8: Rear Cover

    SERVICE ACCESS REAR COVER TO REMOVE: REMOVE THE FACE COVER AND SETSCREW (A) (SEE PAGE 4). OPEN THE SHUTTLE COVER AND REMOVE THE SETSCREWS (B), (C) AND (D). REMOVE THE CAPS AND SETSCREWS (E), (F), (G), REMOVE THE SETSCREWS (H) AND (I). OPEN THE TOP COVER (SEE PAGE 5).

  • Page 9: Front Cover

    SERVICE ACCESS FRONT COVER TO REMOVE: REMOVE THE FACE COVER AND TOP COVER (SEE PAGE 4 AND 5). LOOSEN THE SETSCREW (A). REMOVE THE SETSCREW (B), REMOVE THE REAR COVER (SEE PAGE 6). LOOSEN THE SETSCREW (C), (E) AND (H). REMOVE THE SETSCREW (D). OPEN THE SHUTTLE COVER.

  • Page 10: Mechanical Adjustment

    MECHANICAL ADJUSTMENT NEEDLE THREAD TENSION TO CHECK: THE STANDARD UPPER THREAD TENSION SHOULD BE 65–95 g WHEN PULLING THE THREAD (COTTON THREAD #50) IN THE DIRECTION OF (B) WITH SETTING THE TENSION DIAL AT “3.” (MAKE SURE THE FOOT SHOULD BE LOWERED.) IF THE TENSION IS OUT OF THE STANDARD RANGE, ADJUST IT AS FOLLOWS: ADJUSTMENT PROCEDURE: REMOVE THE FRONT COVER (SEE PAGE 7).

  • Page 11: Bobbin Tension

    MECHANICAL ADJUSTMENT BOBBIN TENSION TO CHECK: SET THE BOBBIN IN THE BOBBIN CASE AND PASS THE THREAD (COTTON #50) THROUGH THE TENSION SPRING. THE BOBBIN THREAD TENSION SHOULD BE 45–55g WHEN PULLING THE THREAD IN THE DIRECTION OF (B). IF THE TENSION IS OUT OF THE RANGE, ADJUST IT AS FOLLOWS: ADJUSTMENT PROCEDURE: TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (D) WHEN THE BOBBIN THREAD TENSION IS TOO TIGHT.

  • Page 12: Presser Bar Height And Alignment

    MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT TO CHECK: RAISE THE PRESSER FOOT LIFTER (A). THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (E) SHOULD BE 6.0 MM (0.24˝). ADJUSTMENT PROCEDURE: REMOVE THE FACE COVER (SEE PAGE 7). REMOVE THE SETSCREWS (B) AND THE LAMP SOCKET, THEN LOOSEN THE SCREW (C) ON THE PRESSER BAR HOLDER.

  • Page 13: Needle Swing

    MECHANICAL ADJUSTMENT NEEDLE SWING TO CHECK: ADJUST THE NEEDLE SWING ACCORDING TO THE FOLLOWING PROCEDURE, IF THE NEEDLE BAR STARTS MOVING SIDEWAYS WHILE THE NEEDLE IS IN THE FABRIC AT SEWING THE ZIGZAG PATTERN (WITH MAXIMUM ZIGZAG WIDTH). ADJUSTMENT PROCEDURE: SET THE PATTERN SELECTOR DIAL WITH MAXIMUM ZIGZAG WIDTH, AND REMOVE THE T TOP COVER (SEE PAGE 4).

  • Page 14: Needle Drop Position

    MECHANICAL ADJUSTMENT NEEDLE DROP POSITION TO CHECK: WHEN THE NEEDLE SWINGS IN MAXIMUM ZIGZAG WIDTH, THE DISTANCE BETWEEN BOTH ENDS OF THE NEEDLE HOLE IN THE NEEDLE PLATE AND THE NEEDLE DROP POSITIONS SHOULD BE EQUAL. IF NOT, ADJUST AS FOLLOWS: ADJUSTMENT PROCEDURE: REMOVE THE FACE COVER (SEE PAGE 4).

  • Page 15: Clearance Between Needle And Shuttle

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND SHUTTLE (ADJUSTMENT METHOD NO. 1) TO CHECK: THE CLEARANCE BETWEEN THE NEEDLE AND SHUTTLE RACE SHOULD BE –0.05 TO +0.10 MM. IF NOT, ADJUST AS FOLLOWS: ADJUSTMENT PROCEDURE: REMOVE THE FACE COVER (SEE PAGE 4). SET THE PATTERN SELECTOR DIAL AT "...
  • Page 16 MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND SHUTTLE (ADJUSTMENT METHOD NO.2) TO CHECK: USE THIS ADJUSTMENT METHOD NO. 2 IF THE CLEARANCE CANNOT BE ADJUSTED BY METHOD NO.1. THE CLEARANCE BETWEEN THE NEEDLE AND SHUTTLE RACE SHOULD BE –0.05 TO +0.10 MM. ADJUSTMENT PROCEDURE: SET THE PATTERN SELECTOR DIAL AT "...

  • Page 17: Feed Dog Height

    MECHANICAL ADJUSTMENT FEED DOG HEIGHT TO CHECK: LOWER THE PRESSER FOOT. TURN THE HANDWHEEL TOWARD YOU UNTIL THE NEEDLE BAR COMES TO THE FEED DOG ABOVE THE NEEDLE PLATE SHOULD BE 0.75–0.90 MM. IF IT IS NOT IN THE RANGE, ADJUST AS FOLLOWS. ADJUSTMENT PROCEDURE: OPEN THE SHUTTLE COVER.

  • Page 18: Needle Bar Height

    MECHANICAL ADJUSTMENT NEEDLE BAR HEIGHT TO CHECK: WHEN THE TIP OF SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE IN ASCENDING TRAVEL OF THE NEEDLE FROM ITS LEFT AND LOWEST POSITION, THE DISTANCE BETWEEN THE TOP OF THE NEEDLE EYE AND THE TIP OF THE SHUTTLE HOOK SHOULD BE IN THE RANGE OF 2.9-3.5 MM.

  • Page 19: Needle Timing To Shuttle

    MECHANICAL ADJUSTMENT NEEDLE TIMING TO SHUTTLE TO CHECK: THE HEIGHT OF THE NEEDLE POINT FROM ITS LOWEST POINT OF TRAVEL SHOULD BE IN THE RANGE OF 1.45-1.95 MM WHEN THE TIP OF THE SHUTTLE HOOK JUST MEETS THE LEFT SIDE OF THE NEEDLE AT THE LEFT NEEDLE POSITION. ADJUSTMENT PROCEDURE: SET THE PATTERN SELECTOR DIAL AT “...

  • Page 20: Buttonhole Feed Balance

    MECHANICAL ADJUSTMENT BUTTONHOLE FEED BALANCE TO CHECK: WHEN SEWING BUTTONHOLE, THE STITCHES ON EACH SIDE OF BUTTONHOLE SHOULD BE THE SAME STITCH DENSITY. THE RANGE OF 9-12 STITCHES IN THE RIGHT SIDE ROW (BACKWARD FEEDING) AGAINST 10 STITCHES IN THE LEFT SIDE ROW (FORWARD FEEDING) IS CONSIDERED ACCEPTABLE.

  • Page 21: Distorted Pattern (Model Next 40, 30 Only)

    MECHANICAL ADJUSTMENT DISTORTED PATTERN (MODEL NEXT 40, 30 ONLY) TO CHECK: IF THE STRETCH STITCH PATTERNS ARE DISTORTED WITH SETTING THE STITCH LENGTH DIAL AT “S.S.”. (IN CASE OF BEING A DIFFERENCE BETWEEN FORWARD FEEDING AND BACKWARD FEEDING DURING STRETCH STITCH PATTERNS), MAKE AN ADJUSTMENT AS FOLLOWS: ADJUSTMENT PROCEDURE: REMOVE THE CAP.

  • Page 22: Bartack Feed Of Buttonhole

    MECHANICAL ADJUSTMENT BARTACK FEED OF BUTTONHOLE TO CHECK: IF THE MATERIAL IS FEED FORWARD OR BACKWARD WHEN SEWING BARTACK ON BUTTONHOLE, MAKE AN ADJUSTMENT AS FOLLOWS: ADJUSTMENT PROCEDURE: SET THE PATTERN SELECTOR DIAL AT " ", AND THE STITCH LENGTH DIAL AT "4". REMOVE THE TOP COVER (SEE PAGE 4).

  • Page 23: Disengagement Of Cam Follower

    MECHANICAL ADJUSTMENT DISENGAGEMENT OF CAM FOLLOWER TO CHECK: IF THE CLEARANCE BETWEEN THE CAM FOLLOWER AND THE TOP CONVEX OF THE ZIGZAG CAM IS NOT ENOUGH, THE PATTERN SELECTOR DIAL IS BLOCKED OR WILL NOT SELECT THE CORRECT PATTERN. ADJUSTMENT PROCEDURE: REMOVE THE FRONT COVER (SEE PAGE 7).

  • Page 24: Motor Belt Tension

    MECHANICAL ADJUSTMENT MOTOR BELT TENSION TO CHECK: IMPROPER BELT TENSION MAY CAUSE NOISE, OVERLOAD OF MOTOR, SLOW RUNNING OR MOTOR BELT JUMPING. THE BELT DEFLECTION SHOULD BE 7 MM - 9 MM WHEN PRESSING THE MIDDLE OF THE MOTOR BELT WITH APPROXIMATELY 300 GRAMS OF PRESSURE. ADJUSTMENT PROCEDURE: REMOVE THE FRONT AND REAR COVER (SEE PAGE 6, 7).

  • Page 25: Wiring

    WIRING 1. WIRING FOR MACHINE SOCKET UNIT M: MOTOR L: LAMP 2. WIRING DIAGRAM FOOT CONTROL MACHINE SOCKET LAMP SOCKET MOTOR...
  • Page 26 BLANK PAGE...

  • Page 27: Partslist

    Model NEXT 20 PARTS LIST PARTS DESCRIPTION PARTS LIST NEXT 20...
  • Page 28 Model NEXT 20 PARTS LIST...
  • Page 29 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310613208 Rear cover (unit) 310048206 Rear cover 652302004 Spool pin 652205006 Spool pin 000120203 Tapping screw 3x8 (B) 000115009 TP screw 3x8 735013108 Spool pin cushion 730006000 Spring 000149312 Setscrew 3x8 (B) 000114710...
  • Page 30 Model NEXT 20 PARTS LIST...
  • Page 31 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310603009 Presser bar base plate (unit) 735221008 Presser bar base plate 310009009 Needle position set plate 000101404 Setscrew 4x6 000115205 TP screw 4x6 000138307 Bolt 4x8 735026001 Presser bar 735027002 Presser bar spring...
  • Page 32 Model NEXT 20 PARTS LIST...
  • Page 33 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310065003 Face plate set plate 000081005 Setscrew 4x8 639017008 Needle bar supporter spring 000120203 Setscrew 3x8 655681009 Lamp socket (unit) 000009102 Lamp 240V, 15W 000053709 Cord tie band 310605001 Needle bar supporter (unit)
  • Page 34 Model NEXT 20 PARTS LIST...
  • Page 35 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310602008 Upper shaft (unit) 102073003 Setscrew 761052007 Setscrew 000036717 Thrust washer 732025001 Upper shaft front bushing 639095000 Ring 000111304 Hexagonal socket screw 5x5 749011109 Worm 000111201 Hexagonal socket screw 4x4 731312005 Felt 304609006...
  • Page 36 Model NEXT 20 PARTS LIST...
  • Page 37 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310601007 Bobbin winder support plate (unit) 310001001 Bobbin winder support plate 310003003 Clutch opener plate 000120203 Setscrew 3x8 (B) 310501006 Bobbin winder arm (unit) 000001609 Snap ring E-5 505071002 Bobbin winder arm spring...
  • Page 38 Model NEXT 20 PARTS LIST...
  • Page 39 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 744004001 Needle plate 681009101 Setscrew 735950003 Lower shaft gear (unit) 000110107 Hexagonal socket screw 5x5WP 000036201 Washer 8-0.5 735233003 Bushing 735061101 Feed lifting cam 000111304 Hexagonal socket screw 5x5 735236006 Lower shaft 822070003...
  • Page 40 Model NEXT 20 PARTS LIST...
  • Page 41 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 735612000 Feed rock shaft (unit) 735078008 Feed rock shaft 735079009 Feed bar 735080003 Feed bar shaft 000002507 Snap ring E-4 000111201 Hexagonal socket screw 4x4 735081004 Feed dog 735082005 Setscrew 735083006 Feed bar spring...
  • Page 42 Model NEXT 20 PARTS LIST...
  • Page 43 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 743611303 Motor assy 743025005 Motor bracket 024070407 Motor 000001960 Setscrew 000201209 Setscrew 5x12 739503308 Machine socket unit 739037007 Machine socket cover 000103509 Setscrew 4x10 000107802 Setscrew 3x10 (B) 000060802...
  • Page 44 Model NEXT 20 PARTS LIST...
  • Page 45 Model NEXT 20 PARTS LIST PARTS DESCRIPTION 310870009 Accessory set 102261000 Bobbin 647808009 Seam ripper 639804000 Needle set 611413002 Slide buttonhole foot 735801008 Darning plate 647803004 Screwdriver (small) 611406002 Zipper foot 611411000 Blind foot 042970402 Foot control 310800123 Instruction book (Sp/Po/It/Fr/Gr)

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