Alfa Network Next 20 Guía de solución de problemas

SERVICE MANUAL

AND

PARTSLIST

Next 20

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 .......................................10

NEEDLE SWING ..................................................................................11

NEEDLE DROP POSITION..................................................................12

CLEARANCE BETWEEN NEEDLE AND SHUTTLE.......................13-14

FEED DOG HEIGHT ............................................................................15

NEEDLE BAR HEIGHT ........................................................................16

NEEDLE TIMING TO SHUTTLE ..........................................................17

BUTTONHOLE FEED BALANCE.........................................................18

DISTORTED PATTERN (MODEL NEXT 40, 30 ONLY).......................18

BARTACK FEED OF BUTTONHOLE...................................................20

DISENGAGEMENT OF CAM FOLLOWER ..........................................21

MOTOR BELT TENSION .....................................................................22

WIRING ................................................................................................23

PARTSLIST .....................................................................................................25~43

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.

FABRIC BEING SEWN.

5. SEWING ON STRETCH USE A #11 BLUE TIP NEEDLE.

FABRIC

6. INAPPROPRIATE NEEDLE SEE MECHANICAL P.16

BAR HEIGHT ADJUSTMENT

“NEEDLE BAR HEIGHT.”

7. INAPPROPRIATE NEEDLE SEE MECHANICAL P.17

TO HOOK TIMING ADJUSTMENT “NEEDLE

TIMING TO SHUTTLE.”

8. INAPPROPRIATE NEEDLE SEE MECHANICAL P.13,14

TO SHUTTLE CLEARANCE ADJUSTMENT “CLEARANCE

BETWEEN NEEDLE AND

SHUTTLE.”

2. FABRIC NOT 1. INCORRECT SEE MECHANICAL P.15

MOVING FEED DOG HEIGHT ADJUSTMENT “FEED DOG

HEIGHT.”

2. THREAD ON BOTTOM SIDE MAKE SURE TO BRING

OF FABRIC IS JAMMED UP. BOTH NEEDLE AND BOBBIN

THREADS UNDER THE FOOT

WHEN START SEWING.

3. FEED DOG TEETH ARE CHANGE THE FEED DOG.

WORN.

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. UPPER THREAD TENSION IS ADJUST UPPER THREAD P.8

TOO STRONG. TENSION CORRECTLY.

5. NEEDLE SIZE IS USE APPROPRIATE NEEDLE

INAPPROPRIATE FOR AND THREAD FOR FABRIC

FABRIC. IN USE.

6. NEEDLE EYE IS WORN. CHANGE THE NEEDLE.

7. NEEDLE HOLE IN NEEDLE REPAIR THE HOLE OR

PLATE IS WORN OR BURRED. REPLACE THE NEEDLE PLATE.

4. BREAKING 1. INCORRECTLY THREADED THREAD BOBBIN CASE

BOBBIN BOBBIN CASE. CORRECTLY.

THREAD 2. TOO MUCH THREAD IS ADJUST THE POSITION OF

WOUND ON THE BOBBIN. STOPPER.

3. LINT IS STUCK INSIDE THE CLEAN THE HOOK RACE.

HOOK RACE.

4. THREAD QUALITY IS CHANGE TO A HIGH QUALITY

TOO LOW. SEWING THREAD.

5. THREAD IS JAMMING CLEAR OUT THE JAMMING

AROUND THE BOBBIN. THREAD.

6. BOBBIN THREAD TENSION IS ADJUST BOBBIN THREAD P.9

TOO STRONG. TENSION CORRECTLY.

5. NEEDLE 1. NEEDLE IS HITTING THE SEE MECHANICAL P.12

BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE DROP.”

2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.

3. NEEDLE IS HITTING THE SEE MECHANICAL P.13, 14

SHUTTLE RACE. ADJUSTMENT “CLEARANCE

BETWEEN NEEDLE AND SHUTTLE”.

4. THE FABRIC MOVES WHILE SEE MECHANICAL P.11

THE NEEDLE IS PIERCING ADJUSTMENT “NEEDLE SWING”.

IT, OR THE NEEDLE ZIGZAGS

WHILE IN FABRIC.

5. FABRIC IS BEING PULLED TOO GUIDE THE FABRIC GENTLY

STRONGLY WHILE SEWING. WHILE SEWING.

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.

3. INAPPROPRIATE BELT SEE MECHANICAL P.22

TENSION. ADJUSTMENT “MOTOR BELT

TENSION”.

4. UPPER SHAFT GEAR IS LOOSE. ELIMINATE THE LOOSENESS.

5. NOT ENOUGH OIL. OIL ALL MOVING PARTS.

7. DEFORMATION 1. INAPPROPRIATE ZIGZAG SEE MECHANICAL P.11

PATTERN SYNCHRONIZATION. ADJUSTMENT “NEEDLE

SWING”.

2. INAPPROPRIATE SEE MECHANICAL P.21

DISENGAGEMENT OF CAM ADJUSTM

FOLLOWER. “DISENGAGEMENT OF CAM

FOLLOWER".

3. UPPER THREAD TENSION ADJUST UPPER THREAD P.8

IS TOO STRONG. TENSION CORRECTLY.

SERVICE ACCESS

FACE COVER

TO REMOVE:

1. REMOVE THE FACE COVER BY REMOVING THE CAP (A) AND SETSCREW (B).

TOP COVER

TO REMOVE:

1. REMOVE THE SETSCREWS (C).

2. SLIDE THE CORNER OF THE TOP COVER SLIGHTLY IN THE DIRECTION OF ARROW.

BE CAREFUL THAT THE THREAD GUIDE SHOULD NOT INTERFEAR WITH THE TOP

COVER WHEN REMOVING.

3. TAKE THE TOP COVER OUT.

TO ATTACH:

4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.

TO ATTACH:

2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.

FACE COVER

SETSCREW(B)

CAP(A)

SETSCREW(C)

THREAD GUIDE

(A)

TO REMOVE:

1. LOOSEN THE SETSCREWS (A).

2. REMOVE THE BASE PLATE.

TO ATTACH:

3. MOUNT THE BASE PLATE AND SECURE IT WITH SETSCREWS.

SERVICE ACCESS

BASE COVER

(D)

(B)

SERVICE ACCESS

REAR COVER

TO REMOVE:

1. REMOVE THE FACE COVER AND SETSCREW (A) (SEE PAGE 4).

2. OPEN THE SHUTTLE COVER AND REMOVE THE SETSCREWS (B), (C) AND (D).

3. REMOVE THE CAPS AND SETSCREWS (E), (F), (G),

4. REMOVE THE SETSCREWS (H) AND (I).

5. OPEN THE TOP COVER (SEE PAGE 5). LOOSEN THE SETSCREW (J).

6. REMOVE THE REAR COVER.

TO ATTACH:

7. MOUNT THE REAR COVER IN REVERSE PROCEDURE OF THE REMOVING.

(A)

(B)

(C)

(D)

(E)

(F)

(G)

(H) (I)

(J)

(C)

SERVICE ACCESS

FRONT COVER

TO REMOVE:

1. REMOVE THE FACE COVER AND TOP COVER (SEE PAGE 4 AND 5).

2. LOOSEN THE SETSCREW (A).

3. REMOVE THE SETSCREW (B),

REMOVE THE REAR COVER (SEE PAGE 6).

LOOSEN THE SETSCREW (C), (E) AND (H). REMOVE THE SETSCREW (D).

4. OPEN THE SHUTTLE COVER. REMOVE THE SETSCREW (F).

5. REMOVE THE BASE COVER AND THE SETSCREW (G) (SEE PAGE 5).

TO ATTACH:

6. MOUNT THE FRONT COVER IN REVERSE PROCEDURE OF THE REMOVING.

(A)

(B)

(C)

(D)

(E)

(F)

(G)

(H)

(B)

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:

1. REMOVE THE FRONT COVER (SEE PAGE 7).

2. TURN THE ADJUSTING NUT (C) IN THE DIRECTION OF (D) WHEN THE UPPER

THREAD TENSION IS TOO TIGHT.

TURN THE ADJUSTING NUT (C) IN THE DIRECTION OF (E) WHEN THE UPPER

THREAD TENSION IS TOO LOOSE.

3. ATTACH THE FRONT COVER UNIT.

(C)

(E)

(D)

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