Promelectroavtomat MC4900QC Manuel utilisateur

SERVICE MANUAL

MODEL MC4900QC

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TABLE OF CONTENTS

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

SERVICE ACCESS (1) FACE COVER....................................................................................................... 4

SERVICE ACCESS (2) TOP COVER......................................................................................................... 5

SERVICE ACCESS (3) REPLACING THE BELT COVER ......................................................................... 6

SERVICE ACCESS (4) REPLACING THE BED COVER........................................................................... 7

SERVICE ACCESS (4) REPLACING THE BASE ...................................................................................... 7

SERVICE ACCESS (5) REPLACING THE FRONT COVER...................................................................... 8

SERVICE ACCESS (6) REPLACING THE REAR COVER ........................................................................ 9

ADJUSTING PRESSER FOOT HEIGHT AND ALIGNMENT .................................................................. 10

NEEDLE DROP POSITION ALIGNMENT ............................................................................................... 11

ADJUSTING HOOK TIMING.................................................................................................................... 12

ADJUSTING NEEDLE BAR HEIGHT ...................................................................................................... 13

ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK ............................................................... 14

ADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR AND LOWER SHAFT GEAR .................... 15

FEED DOG HEIGHT ADJUSTMENT....................................................................................................... 16

ZIGZAG SYNCHRONIZATION................................................................................................................. 17

NEEDLE THREAD TENSION .................................................................................................................. 18

STRETCH STITCH FEED BALANCE...................................................................................................... 19

REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE ...................................... 20

CONNECTOR DIAGRAM ........................................................................................................................ 21

SELF DIAGNOSTIC TESTS ............................................................................................................... 22-25

REPLACING PRINTED CIRCUIT BOARD “A”......................................................................................... 26

REPLACING PRINTED CIRCUIT BOARD “K” AND “F”........................................................................... 27

REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION.................................................. 28

REPLACING THE FUSES ....................................................................................................................... 29

REPLACING MACHINE SOCKET ........................................................................................................... 30

REPLACING THE TRANSFORMER........................................................................................................ 31

REPLACING THE ZIGZAG WIDTH MOTOR ........................................................................................... 32

REPLACING FEED STEPPING MOTOR................................................................................................. 33

ADJUSTING BUTTONHOLE LEVER POSITION .................................................................................... 34

ADJUSTING THE BOBBIN WINDING SWITCH ...................................................................................... 35

ADJUSTING KNEE LIFTER HEIGHT ...................................................................................................... 36

OILING ..................................................................................................................................................... 37

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CONDITION CAUSE HOW TO FIX REFERENCE

1. SKIPPING

STITCHES

1. NEEDLE IS NOT INSERTED

PROPERLY.

2. NEEDLE IS BENT OR WORN.

3. INCORRECTLY THREADED.

4. NEEDLE OR THREAD ARE

INAPPROPRIATE FOR

FABRIC BEING SEWN.

5. SEWING ON STRETCH

FABRIC.

6. PRESSER FOOT PRESSURE

IS TOO WEAK.

7. INAPPROPRIATE NEEDLE

BAR HEIGHT.

8. INAPPPROPRIATE NEEDLE

TO HOOK TIMING.

9. INAPPROPRIATE NEEDLE

TO HOOK CLEARANCE.

INSERT THE NEEDLE PROPERLY.

CHANGE THE NEEDLE.

RETHREAD.

USE THE RECOMMENDED

SEWING NEEDLE AND THREAD.

USE A #11 BLUE TIP NEEDLE.

ADJUST THE PRESSER BAR

LEVEL TO MAKE THE

PRESSURE STRONGER.

SEE MECHANICAL ADJUSTMENT

“NEEDLE BAR HEIGHT”.

SEE MECHANICAL ADJUSTMENT

“NEEDLE TO HOOK TIMING”.

SEE MECHANICAL ADJUSTMENT

“CLEARANCE BETWEEN NEEDLE

AND HOOK”.

P. 1 3

P. 1 2

P. 1 4

2. FABRIC NOT

MOVING

1. PRESSER FOOT PRESSURE

IS TOO WEAK.

2. INCORRECT FEED DOG HEIGHT.

3. FEED DOG IS IN DOWN

POSITION.

4.THREAD ON BOTTOM SIDE

OF FABRIC IS JAMMED UP.

5. FEED DOG TEETH ARE WORN.

ADJUST THE PRESSER BAR

LEVEL TO MAKE THE

PRESSURE STRONGER.

SEE MECHANICAL

ADJUSTMENT “FEED DOG HEIGHT”.

RAISE THE FEED DOG.

MAKE SURE TO BRING BOTH

NEEDLE AND BOBBIN.

THREAD UNDER THE FOOT WHEN

STARTING SEWING.

CHANGE THE FEED DOG.

P. 1 6

WHAT TO DO WHEN

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CONDITION CAUSE HOW TO FIX REFERENCE

3. BREAKING

UPPER

THREAD

1. INITIAL SEWING SPEED IS

TOO FAST.

2. THREAD PATH IS INCORRECT.

3. NEEDLE IS BENT OR DULL.

4. UPPER THREAD TENSION IS

TOO STRONG.

5. NEEDLE SIZE IS

INAPPROPRIATE FOR FABRIC.

6. NEEDLE EYE IS WORN.

7. NEEDLE HOLE IN NEEDLE

PLATE IS WORN OR BURRED.

START WITH MEDIUM SPEED.

USE THE PROPER THREAD PATH.

REPLACE WITH A NEW NEEDLE.

ADJUST NEEDLE THREAD TENSION

CORRECTLY.

USE APPROPRIATE NEEDLE FOR

FABRIC AND THREAD IN USE.

CHANGE THE NEEDLE.

REPAIR THE HOLE OR REPLACE

THE NEEDLE PLATE.

P. 1 8

4. BREAKING

BOBBIN

THREAD

1. INCORRECITLY THREADED

BOBBIN.

2. TOO MUCH THREAD IS

AROUND ON THE BOBBIN.

3. LINT IS STUCK INSIDE THE

BOBBIN HOLDER.

4. THREAD QUALITY IS

TOO LOW.

5. THREAD IS JAMMING

AROUND THE BOBBIN.

THREAD BOBBIN CORRECTLY.

ADJUST THE POSITION OF STOPPER.

CLEAN THE SHUTTLE.

CHANGE TO A HIGH QUALITY

SEWING THREAD.

CLEAR OUT THE JAMMING THREAD.

5. NEEDLE

BREAKS

1. NEEDLE IS HITTING THE

NEEDLE PLATE.

2. NEEDLE IS BENT OR WORN.

3. NEEDLE IS HITTING THE

SHUTTLE.

4. THE FABRIC MOVES WHILE

THE NEEDLE IS PIERCING

IT, OR THE NEEDLE ZIGZAGS

WHILE IN FABRIC.

5. FABIRIC IS BEING PULLED TOO

STRONGLY WHILE SEWING.

SEE MECHANICAL

ADJUSTMENT “NEEDLE POSITION”.

CHANGE THE NEEDLE.

SEE MECHANICAL ADJUSTMENT

“CLEARANCE BETWEEN NEEDLE

AND HOOK”.

SEE MECHANICAL ADJUSTMENT

“ZIGZAG SYNCHRONIZATION”.

GUIDE THE FABRIC GENTLY

WHILE SEWING.

P. 1 1

P. 1 4

P. 1 7

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CONDITION CAUSE HOW TO FIX REFERENCE

6. NOISY

OPERATION

1. BACKLASH BETWEEN SHTTLE

HOOK GEAR AND LOWER

SHAFT GEAR IS TOO GREAT.

2. LOWER SHAFT GEAR IS

LOOSE.

3. INAPPROPRIATTE BELT

TENSION.

4. NOT ENOUGH OIL.

SEE MECHANICAL ADJUSTMENT

“BACKLASH (LOWER SHAFT GEAR)”.

ELIMINATE THE LOOSENESS.

SEE PART REMOVAL AND

REPLACEMENT “DRIVING MOTOR

(DC MOTOR)”.

OIL ALL MOVING PARTS.

P. 1 5

P. 2 8

P. 3 7

7. DEFORMATION

PATTERN

1. INAPPROPRIATE FEED

BALANCE.

2. INAPPROPRIATE ZIGZAG

SYNCHRONIZATION.

3. UPPER THREAD TENSION

IS TOO STRONG.

SEE MECHANICAL ADJUSTMENT

“STRETCH STITCH FEED BALANCE”.

SEE MECHANICAL ADJUSTMENT

“ZIGZAG SYNCHRONIZATION”.

SEE MECHANICAL ADJUSTMENT

“NEEDLE THREAD TENSION”.

P. 1 9

P. 1 7

P. 1 8

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SERVICE ACCESS (1)

FACE COVER (UNIT)

TO REMOVE:

REMOVE THE CAP AND SETSCREW.

REMOVE THE FACE COVER

TO ATTACH:

FOLLOW THE PROCEDURE ABOVE IN REVERSE.

SETSCREW

CAP

FACE COVER

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SERVICE ACCESS (2)

SETSCREW (A)

CARRYING HANDLE

SETSCREW

FACE PLATE

TOP COVER (UNIT)

TO REMOVE:

RAISE THE CARRYING HANDLE AND THE SETSCREW (A).

OPEN THE TOP COVER AND REMOVE THE SETSCREW (B).

LIFT UP THE TOP COVER AND REMOVE IT FROM THE REAR SIDE.

TO ATTACH:

FOLLOW THE PROCEDURE ABOVE IN REVERSE.

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SETSCREW (A)

CARRYING

HANDLE

SETSCREW (B)

SERVICE ACCESS (3)

REPLACING THE BELT COVER

TO REMOVE:

1. RAISE THE CARRYING HANDLE AND LOOSEN THE SCREW (A).

2. LOOSEN THE SCREW (B) AND THE BELT COVER.

TO ATTACH:

FOLLOW THE PROCEDURE IN REVERSE.

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SETSCREW (B)

SETSCREWS (A)

DROP FEED DOG

LEVER

BED COVER (UNIT)

SETSCREW (C)

SETSCREW (A)

SETSCREW (D)

SETSCREW (E)

BASE

SERVICE ACCESS (4)

REPLACING THE BED COVER (UNIT)

TO REMOVE:

PUSH THE DROP FEED DOG LEVER TO THE LEFT. REMOVE THE SETSCREWS (A), THEN REMOVE

THE BED COVER (UNIT).

TO ATTACH:

PUSH THE DROP FEED DOG LEVER TO THE LEFT. ATTACH THE BED COVER (UNIT) AND TIGHTEN

THE SETSCREWS (A).

REPLACING THE BASE

TO REMOVE:

REMOVE THE SETSCREWS (A), (B), (C), (D) AND (E).

REMOVE THE BASE.

TO ATTACH:

FOLLOW THE PROCEDURE IN REVERSE.

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SERVICE ACCESS (5)

REPLACING THE FRONT COVER (UNIT)

TO REMOVE:

REMOVE THE FACE COVER (UNIT), TOP COVER (UNIT) AND BELT COVER. (SEE PAGE 7, 8)

LOOSEN THE SETSCREWS (A), (B) AND (C). THEN REMOVE THE FRONT COVER (UNIT). DISCONNECT

THE CONNECTOR FOR PRINTED CIRCUIT BOARD-F AND FLEXIBLE FLAT CABLE FROM THE PRINTED

BOARD-A.

NOTE:

NEVER PULL ON CORD WHEN DISCONNECT THE CABLES FROM THE CIRCUIT BOARD.

TO ATTACH:

FOLLOW THE PROCEDURE IN REVERSE.

SETSCREW (C)

SETSCREW (B)

SETSCREW (A)

FRONT COVER

SETSCREW (A)

SETSCREW (B)

SETSCREW (C)

CONNECTOR FOR

PRINTED CIRCUIT

BOARD F

FLEXIBLE FLAT CABLE

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