JF series.pdf

SERVICING MANUAL

JF SERIES MODELS

CONTENTS

WHAT TO DO WHEN ................................................................................................................................. 1 - 3

SERVICE ACCESS

FACE PLATE ........................................................................................................................................ 4

BELT COVER ....................................................................................................................................... 4

BED BASE PLATE ............................................................................................................................... 4

FRONT COVER ................................................................................................................................... 5

REAR COVER ...................................................................................................................................... 6

MECHANICAL ADJUSTMENT

UPPER THREAD TENSION DIAL .......................................................................................................7

BOBBIN THREAD TENSION ............................................................................................................... 8

PRESSER BAR HEIGHT AND ALIGNMENT ....................................................................................... 9

NEEDLE SWING ................................................................................................................................ 10

NEEDLE DROP .................................................................................................................................. 11

HEIGET OF FEED DOG .................................................................................................................... 12

CLEARANCE BETWEEN NEEDLE AND HOOK (NO.1) ................................................................... 13

CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2) ................................................................... 14

NEEDLE BAR HEIGHT ...................................................................................................................... 15

HOOK TIMING ................................................................................................................................... 16

FEED BALANCE ON STRETCH STITCH .......................................................................................... 17

BUTTOHOLE FEED BALANCE ......................................................................................................... 18

BARTACK FEED OF BUTTONHOLE ................................................................................................. 19

DISENGAGEMENT OF CAM FOLLOWER (NO.1) ............................................................................ 20

NEEDLE MOVEMENT FOR STRAIGHT STITCH .............................................................................. 21

DESENGAGEMENT OF CAM FOLLOWER (NO.2) ................................................................... 22 - 23

BUTTONHOLE FUNCTION ............................................................................................................... 24

MOTOR BELT TENSION ................................................................................................................... 25

WIRING ......................................................................................................................................................... 26

WHAT TO DO WHEN

CONDITION

CAUSE

HOW TO FIX

REFERENCE

1. SKIPPING

STITCHES

1. NEEDLE IS NOT

INSERTED PROPERLY.

INSERT THE NEEDLE

PROPERLY.

2. NEEDLE IS BENT OR

WORN.

CHANGE THE NEEDLE.

3. INCORRECTLY

THREADED.

RETREAD.

4. NEEDLE OR THREAD ARE

INAPPROPRIATE FOR

FABRIC BEING SEWN.

USE THE RECOMMENDED

SEWING NEEDLE AND THREAD.

5. SEWING ON STRETCH

FABRIC.

USE A #11 BLUE TIP NEEDLE.

6. INAPPROPRIATE NEEDLE

BAR HEIGHT.

SEE MECHANICAL ADJUSTMENT

ÒNEEDLE BAR HEIGHTÓ.

P.15

7. INAPPROPRIATE NEEDLE

TO HOOK TIMING.

SEE MECHANICAL ADJUSTMENT

ÒHOOK TIMINGÓ.

P.16

8. INAPPROPRIATE NEEDLE

TO HOOK CLEARANCE.

SEE MECHANICAL ADJUSTMENT

ÒCLEARANCE BETWEEN

NEEDLE AND HOOKÓ.

P.13,P.14

2. FABRIC NOT

MOVEING

1. INCORECT F.D. HEIGHT.

SEE MECHANICAL ADJUSTMENT

ÒHEIGHT OF FEED DOGÓ.

P.12

2. THREAD ON BOTTOM

SIDE OF FABRIC IS

JAMMED UP.

MAKE SURE TO BRING BOTH

NEEDLE AND BOBIN THREAD

UNDER THE FOOT WHEN

STARTING SEWING.

3. FEED DOG TEETH ARE

WORN.

CHANGE TO FEED DOG.

WHAT TO DO WHEN

CONDITION

CAUSE

HOW TO FIX

REFERENCE

3. BREAKING

UPPER

THREAD

1. INITIAL SEWING SPEED IS

TOO FAST.

START WITH MEDIUM SPEED.

2. THREAD PATH IS

INCORRECT.

USE THE PROPER THREAD

PATH.

3. NEEDLE IS BENT OR

DULL.

REPLACE WITH A NEW NEEDLE.

4. UPPER THREAD TENSION

IS TOO STRONG.

ADJUST UPPER THREAD

TENSION CORRECTLY.

P. 7

5. NEEDLE SIZE IS

INAPPROPRIATE FOR

FABRIC.

USE APPROPRIATE NEEDLE

FOR FABRIC AND THREAD IN

USE.

6. NEEDLE EYE IS WORN.

CHANGE THE NEEDLE.

7. NEEDLE HOLE IN NEEDLE

PLATE IS WORN OR

BURRED.

REPAIR THE HOLE OR REPLACE

THE NEEDLE PLATE.

4. BREAKNG

BOBBIN

THREAD

1. INCORRECTLY

THREADED BOBBIN

CASE.

THREAD BOBBIN CASE

CORRECTLY.

2. TOO MUCH THREAD IS

AROUND IN THE BOBBIN.

ADJUST THE POSITION OF

STOPPER.

3. LINT IS STUCK INSIDE

THE BOBBIN HOLDER.

CLEAN THE HOOK RACE.

4. THREAD QUALITY IS TOO

LOW.

CHANGE TO HIGH QUALITY

SEWING THREAD.

5. THREAD IS JAMMING

AROUNG THE BOBBIN.

CLEAR OUT THE JUMMING

THREAD.

6. BOBBIN THREAD

TENSION IS TOO

STRONG.

ADJUST BOBBIN THREAD

TENSION CORRECTLY.

P. 8

5. NEEDLE

BREAKS

1. NEEDLE IS HITTING THE

NEEDLE PLATE.

SEE MECHANICAL ADJUSTMENT

ÒNEEDLE DROP.Ó

P. 11

2. NEEDLE IS BENT OR

WORN.

CHANGE THE NEEDLE.

3. NEEDLE IS HITTING THE

HOOK RACE.

SEE MECHANICAL ADJUSTMENT

ÒCLEARANCE BETWEEN

NEEDLE AND HOOKÓ

P.13, P.14

WHAT TO DO WHEN

CONDITION

CAUSE

HOW TO FIX

REFERENCE

5. NEEDLE

BREAKS

4. THE FABRIC MOVES

WHILE THE NEEDLE IS

PIERCING IT, OR THE

NEEDLE ZIGZAGS WHILE

IN FABRIC.

SEE MECHANICAL ADJUSTMENT

ÒNEEDLE SEWINGÓ.

P.10

5. FABRIC IN BEING PULLED

TOO STRONGLY EHILE

SEWING.

GUIDE THE FABRIC GENTLY

WHILE SEWING.

6. NOISY

OPERATION

1. BACKLASH BETWEEN

SHUTTLE HOOK GEAR

AND LOWER SHAFT GEAR

IS TOO GREAT.

SEE MECHANICAL ADJUSTMENT

ÒCLEARANCE BETWEEN

NEEDLE AND HOOK (NO.2)Ó.

P.14

2. LOWER SHAFT GEAR IS

LOOSE.

ELIMINATE THE LOOSENESS.

3. INAPPROPRIATE BELT

TESION.

SEE MECHANICAL ADJUSTMENT

ÒMOTOR BELT TENSIONÓ.

P.25

4. UPPER SHAFT GEAR IS

LOOSE.

ELIMINATE THE LOOSENESS.

5. NOT ENOUGH OIL.

OIL ALL MOVEING PARTS.

7.DEFORMATION

PATTERN

1. INAPPROPRIATE ZIGZAG

SYNCHRONIZATION.

SEE MECANICAL ADJUSTMENT

ÒNEEDLE SEWINGÓ.

P.10

2. INAPPROPRIATE

DISENGAGEMENT OF AM

FOLLOWER.

SEE MECANICAL ADJUSTMENT

ÒDISENGAGEMENT OF CAM

FOLLOWERÓ.

P.20 - P.23

3. UPPER THREAD TENSION

IS TOO STRONG.

ADJUST UPPER THREAD

TENSION CORRECTLY.

P. 7

4. INAPPROPRIATE FEED

BALANCE.

SEE MECHANICAL ADJUSTMENT

ÒFEED BALANCE ON STRECH

STITCHÓ.

P.17

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