promelectroavtomat MC4900QC User manual

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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1
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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2
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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3
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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4
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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5
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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6
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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7
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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8
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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9
SETSCREW (C)
SETSCREW (D)
SERVICE ACCESS (6)
REPLACING THE REAR COVER
TO REMOVE:
REMOVE THE FACE COVER (UNIT), TOP COVER (UNIT) AND BELT COVER. (SEE PAGE 9, 10)
LOOSEN THE SETSCREWS (A), (B), (C) AND (D). REMOVE THE SETSCREW (E) AND LOWER THE PRESSER
FOOT LIFTER. REMOVE THE REAR COVER FROM THE PRESSER LIFTER SECTION FIRST.
TO ATTACH:
FOLLOW THE PROCEDURE ABOVE IN REVERSE..
SETSCREW (A)
SETSCREW (B)
PRESSER FOOT
LIFTER
SETSCREW (C)
SETSCREW (D)
SETSCREW (E)
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10
WHEN THE PRESSER FOOT IS RAISED, THE CLEARANCE BETWEEN THE PRESSER
FOOT AND THE NEEDLE PLATE SHOULD BE 5.7 TO 6.3 MM.
1. REMOVE THE FACE COVER AND RAISE THE PRESSER FOOT.
LOOSEN THE SETSCREW TO ADJUST PRESSER FOOT HEIGHT (6.0 MM) AND PRESSER FOOT
ALIGNMENT.
2. TIGHTEN THE SETSCREW FIRMLY.
3. ATTACH THE FACE COVER.
ADJUSTING PRESSER FOOT HEIGHT AND ALIGNMENT
PRESSER FOOT
LIFTER
SETSCREW 4 X 8
PRESSER FOOT
NEEDLE PLATE
[HEIGHT OF PRESSER FOOT] PRESSER FOOT ALIGNMENT
SHOULD BE
PARALLEL
FEED DOG
5.7 TO 6.3 MM
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11
NEEDLE DROP POSITION ALIGNMENTNEEDLE DROP POSITION ALIGNMENT
NEEDLE DROP POSITION ALIGNMENTNEEDLE DROP POSITION ALIGNMENT
NEEDLE DROP POSITION ALIGNMENT
SELECT THE STITCH PATTERN " "; THE STANDARD NEEDLE DROP POSITION
SHOULD BE AT THE CENTER OF THE NEEDLE PLATE HOLE.
WHEN THE NEEDLE SWINGS IN MAXIMUM ZIGZAG WIDTH " ", THE CLEARANCE
BETWEEN BOTH ENDS OF THE NEEDLE HOLE IN THE NEEDLE PLATE AND THE
NEEDLE SHOULD BE 0.2 MM OR MORE. IF NOT, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:ADJUSTMENT PROCEDURE:
ADJUSTMENT PROCEDURE:ADJUSTMENT PROCEDURE:
ADJUSTMENT PROCEDURE:
1. TURN ON THE POWER SWITCH, SELECT THE STRAIGHT STITCH PATTERN " " AND THE ZIGZAG
WIDTH AT MAXIMUM " " THEN CHECK THE NEEDLE DROP POSITION.
2. IF THE NEEDLE DROP POSITION IS NOT IN THE CENTER OF THE NEEDLE PLATE HOLE WHEN THE
STRAIGHT STITCH IS SELECTED, OR IF THE CLEARANCE BETWEEN THE NEEDLE AND EDGE OF
THE NEEDLE PLATE HOLE ON BOTH SIDE IS LESS THAN 0.2 MM WHEN THE STITCH PATTERN IS
SET TO MAXIMUM ZIGZAG WIDTH, REMOVE THE FACE COVER AND LOOSEN THE SETSCREW, THEN
ADJUST THE NEEDLE DROP POSITION BY TURNING THE ECCENTRIC PIN.
NOTE:NOTE:
NOTE:NOTE:
NOTE:
MAKE SURE THE ECCENTRIC PIN IS POSITIONED WITH ITS OFF-CENTER HEAD FACING DOWNWARD.
WHEN YOU HAVE FINISHED ADJUSTING THE NEEDLE DROP POSITION, TIGHTEN THE SETSCREW AND
ATTACH THE FACE COVER.
ECCENTRIC PIN
SETSCREW 3 X 4
NEEDLE PLATE HOLE
ECCENTRIC PIN POSITION
(OFF CENTER HEAD)
ADJUST THE NEEDLE DROP POSITION BY TURNING THE
ECCENTRIC PIN AS SHOWN 0.2 MM OR
MORE
A=B
0.2 MM OR
MORE
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12
LOWER SHAFT
GEAR
SETSCREW
(2)
ADJUSTING HOOK TIMINGADJUSTING HOOK TIMING
ADJUSTING HOOK TIMINGADJUSTING HOOK TIMING
ADJUSTING HOOK TIMING
NEEDLE PLATE
BOBBIN HOLDER
3.4±0.15mm
TIP OF ROTARY HOOK
MEETS WITH THE RIGHT SIDE
OF NEEDLE PLATE
LOWEST NEEDLE
POSITION
THE HOOK TIMING IS THAT AMOUNT OF ASCENDING TRAVEL OF THE NEDLE BAR
FROM ITS LOWEST POSITION WHERE THE TIP OF THE ROTARY HOOK MEETS THE
RIGHT SIDE OF THE NEEDLE SHOULD BE 3.25 TO 3.55 MM.
1TURN ON THE POEWR SWITCH TO DISPLAY THE STITCH PATTERN " ". ADJUST THE
STITCH WIDTH TO O.O. TURN OFF THE POWER SWITCH.
2REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER (B).
REMOVE THE BED COVER (SEE PAGE 7).
3 LOWER THE NEEDLE BAR AT ITS LOWEST POSITION BY TURNING THE HANDWHEEL TOWARD
YOU.
4 LOOSEN THE SCREWS OF LOWER SHAFT GEAR.
5RAISE THE NEEDLE BAR FURTHER 3.4 MM FROM THE LOWEST POSITION.
6 TURN THE LOWER SHAFT GEAR UNTIL THE TIP OF ROTARY HOOK MEETS WITH THE RIGHT
SIDE OF THE NEEDLE. TIGHTEN SCREWS (2 PIECES) OF THE LOWER SHAFT GEAR.
6ATTACH THE BED COVER, BOBBIN HOLDER AND NEEDLE PLATE.
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13
ADJUSTING NEEDLE BAR HEIGHTADJUSTING NEEDLE BAR HEIGHT
ADJUSTING NEEDLE BAR HEIGHTADJUSTING NEEDLE BAR HEIGHT
ADJUSTING NEEDLE BAR HEIGHT
NEEDLE PLATE
BOBBIN HOLDER
SCREW
TOP OF NEEDLE EYE
1.8±0.2mm
ROTARY HOOK RACE
NEEDLE #14
MATCHING POINT
SURFACE OF HOOK RACE
THE STANDARD DISTANCE BETWEEN THE UPPER EDGE OF THE NEEDLE EYE AND
THE TIP OF THE ROTARY HOOK SHOULD BE IN THE RANGE OF 1.6 TO 2.0 MM WHEN
THE ROTARY HOOK MEETS THE RIGHT SIDE OF THE NEEDLE IN ASCENDING TRAVEL
OF NEEDLE FROM ITS LOWEST POSITION.
NOTE: ENSURE THAT THE NEEDLE TO HOOK TIMING IS CORRECTLY ADJUSTED BEFORE ADJUSTING
THE NEEDLE BAR HEIGHT.
1. TURN ON THE POWER SWITCH AND SELECT THE STITCH PATTERN " " ADJUST THE NEEDLE
DROP POSITION TO 0.0 (LEFT MOST POSITION), THEN TURN OFF THE POWER SWITCH.
2. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
3. ALIGN THE TIP OF ROTARY HOOK WITH THE RIGHT SIDE OF THE NEEDLE IN ASCENDING TRAVEL
OF NEEDLE FROM ITS LOWEST POSITION BY TURNING THE HANDWHEEL TOWARD YOU.
4. REMOVE THE FACE PLATE AND LOOSEN THE SETSCREW.
5. MOVE THE NEEDLE BAR UP AND DOWN TO ADJUST THE NEEDLE BAR HEIGHT.
6. MAKE SURE THAT THE NEEDLE BAR GROOVE IS IN FRONT OF YOU AND TIGHTEN THE SCREW.
7. ATTACH THE BOBBIN HOLDER, NEEDLE PLATE AND FACE PLATE.
NEEDLE BAR GROOVE
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14
THE CLEARENCE BETWEEN NEEDLE AND ROTARY HOOK SHOULD BE
-0.10 TO +0.05 MM.
1. TURN THE POWER SWITCH ON. SELECT THE ZIGZAG STITCH ( ) AND SET THE ZIGZAG WIDTH AT
MAXIMUM.
2. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER. ATTACH THE TEST PIN.
3. REMOVE THE BED COVER. (SEE PAGE 7) LOOSEN THE SETSCREWS (A), (B) AND SLIGHTLY
LOOSEN THE SET SCREW (C).
4. TURN THE HANDWHEEL TOWARD YOU TO BRING THE TIP OF THE HOOK BEHIND THE TEST PIN
AND ADJUST THE CLEARANCE BETWEEN THE TEST PIN AND THE TIP OF ROTARY HOOK
TO -0.10 TO +0.05 BY MOVING THE ROTARY HOOK SET PLATE UP OR DOWN.
5. TIGHTEN THE SCREW (A), (B), (C) FIRMLY.
6. CHECK THE ROTARY HOOK DRIVER GEAR AND THE LOWER SHAFT GEAR BACKLASH.
IF GEARS MESH OR ENGAGE TIGHTLY OR LOOSELY, ADJUST BACKLASH BETWEEN HOOK
DRIVE AND LOWER SHAFT GEAR".
7. REATTACH THE BED COVER, NEEDLE PLATE AND BOBBIN HOLDER. REPLACE THE TEST PIN WITH
THE REGULAR NEEDLE.
TEST PIN
-0.1 TO + 0.05 mm TIP OF ROTARY HOOK
SETSCREW(B)
ROTARY HOOK
SET PLATE
SETSCREW(A)
SETSCREW(C)
ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOKADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK
ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOKADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK
ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK
NEEDLE PLATE
BOBBIN
HOOK
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15
Ａ
Ｂ
ADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR ANDADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR AND
ADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR ANDADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR AND
ADJUSTING BACKLASH BETWEEN HOOK DRIVE GEAR AND
LOWER SHAFT GEARLOWER SHAFT GEAR
LOWER SHAFT GEARLOWER SHAFT GEAR
LOWER SHAFT GEAR
ROTARY PLAY OF GEARS SHOULD BE 0.8 MM OR LESS WHEN THE TIP OF THE ROTARY
HOOK IS WITHIN THE WIDTH OF THE FEED DOG AS SHOWN BELOW.
TO CHECKTO CHECK
TO CHECKTO CHECK
TO CHECK
1. TURN THE POWER SWITCH OFF. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
REMOVE THE BED COVER.
2. TURN THE HANDWHEEL SLOWLY TOWARD YOU UNTIL THE TIP OF THE HOOK (A) IS BETWEEN
WIDTH (B) OF FEED DOG.
3. SWAY THE HOOK RACE CLOCKWISE AND COUNTERCLOCKWISE BY FINGER. CHECK THE
PLAY. IT SHOULD BE 0.8 MM OR LESS.
*IF THERE IS MORE THAN 0.8 MM PLAY, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:ADJUSTMENT PROCEDURE:
ADJUSTMENT PROCEDURE:ADJUSTMENT PROCEDURE:
ADJUSTMENT PROCEDURE:
1. REMOVE THE BED COVER AND LOOSEN THE HEXAGONAL SCREW (C).
2. TURN THE LOWER SHAFT BUSHING (D) (ECCENTRIC), IN THE DIRECTION "E" WHEN THE PLAY
AT SHATTLE HOOK TIP IS TOO SMALL.
3. TURN THE LOWER SHAFT BUSHING (D) (ECCENTRIC), INT THE DIRECTION "F" WHEN THE PLAY
AT THE HOOK TIP IS TOO LARGE.
4. TIGHTEN HEXAGONAL SCREW (C) SECURELY AFTER ADJUSTMENT.
LOWER SHAFT BUSHING
TIP OF THE HOOK
ROTARY PLAY
SHOULD BE 0.8
MM OR LESS
LOWER SHAFT GEAR GROOVE OF LOWER SHAFT BUSHING (D)
HEXAGONAL SCREW (C)
(B)
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16
WHEN THE PRESSER FOOT IS LOWERED WITH THE PRESSURE DIAL SET AT "3", THE
HIGHEST POSITION OF THE FEED DOG SHOULD BE 0.75 TO 0.85 MM ABOVE THE
SURFACE OF THE NEEDLE PLATE.
1. SET THE PRESSURE DIAL AT "3" AND LOWER THE PRESSURE FOOT THEN TURN ON THE POWER
SWITCH.
2. TURN THE HANDWHEEL TOWARD YOU UNTIL THE FEED DOG COMES TO ITS HIGHEST POSITION.
3. REMOVE THE BED COVER (SEE PAGE 7)
4. LOOSEN SETSCREW (A) AND NUT.
5. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF "E" TO RAISE THE FEED OR TURN THE
ADJUSTING SCREW (C) IN THE DIRECTION OF "D" TO LOWER THE FEED DOG, SO THAT THE FEED
DOG HIGHEST IS 0.8 MM ABOVE THE TOP SURFACE OF THE NEEDLE PLATE.
6. TIGHTEN THE NUT AND SET SCREW(A).
7. ATTACH THE BED COVER.
FEED DOG HEIGHT ADJUSTMENTFEED DOG HEIGHT ADJUSTMENT
FEED DOG HEIGHT ADJUSTMENTFEED DOG HEIGHT ADJUSTMENT
FEED DOG HEIGHT ADJUSTMENT
E (TO RAISE)
D
(TO LOWER)
ADUSTING SCREW (C)
NUT(B)
SETSCREW (A)
PRESSURE DIAL AT 3
STANDARD FOOT
0.80±0.05mm
SURFACE OF THE
NEEDLE PLATE
FEED DOG
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17
Ａ
Ｂ
DURING LATERAL MOVEMENT OF THE NEEDLE IN ZIGZAG SEWING, THE NEEDLE
SHOULD START TO SWING 6.3 TO 7.5 MM ABOVE THE NEEDLE PLATE.
1. REMOVE THE COVER.
2. TURN ON THE POWER SWITCH AND SET THE PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG
WIDTH.
3. TURN THE HANDWHEEL TOWARD YOU AND STOP TURNING WHEN THE NEEDLE STARTS ITS
SIDEWARD MOVEMENT AND LOOSEN SETSCREW.
4. IF THE NEEDLE HEIGHT IS HIGHER THAN 7.5 MM, TURN THE UPPERSHAFT SHIELDING PLATE IN
THE DIRECTION OF "A" IF THE NEEDLE HEIGHT IS LOWER THAN 6.3 MM, TURN THE UPPER
SHAFT SHIELDING PLATE IN THE DIRECTION OF "B".
5. MAKE SURE THE UPPER SHAFT SHIELDING PLATE IS NOT TOUCHING THE UPPER SHAFT
SENSOR AND TIGHTEN SETSCREW.
6. TURN THE HANDWHEEL TOWARD YOU TO CONFIRM THE NEEDLE MOVEMENT, AFTER THE
CONFIRMATION, REATTACH THE TOP COVER AND FACE COVER.
ZIGZAG SYNCHRONIZATIONZIGZAG SYNCHRONIZATION
ZIGZAG SYNCHRONIZATIONZIGZAG SYNCHRONIZATION
ZIGZAG SYNCHRONIZATION
NEEDLE
6.3–7.5 mm
SURFACE OF THE
NEEDLE PLATE
UPPER SHAFT
SHIELDING PLATE
SETSCREW
UPPER SHAFT
SENSOR
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18
A
B
WHEN THE POLYESTER SEWING THREAD #50 (WHITE) IS PASSED THROUGH AND
PULLEAD UP AS IN FIG. 1, THE THREAD TENSION SHOULD BE 75 TO 90 GRAMS (THE
THREAD PULLING SPEED: APROX. 110 MM/SEC) WITH THE THREAD TENSION DIAL
SET AT "AUTO). IF THE TENSION IS OUT OF THE STANDARD RANGE, ADJUST IT AS
FOLLOWS.
NEEDLE THREAD TENSIONNEEDLE THREAD TENSION
NEEDLE THREAD TENSIONNEEDLE THREAD TENSION
NEEDLE THREAD TENSION
ADJUSTMENT PROLEDURE:ADJUSTMENT PROLEDURE:
ADJUSTMENT PROLEDURE:ADJUSTMENT PROLEDURE:
ADJUSTMENT PROLEDURE:
1. SET THE THREAD TENSION AT "AUTO".
2. REMOVE THE FACE COVER (SEE PAGE 9).
3. TURN THE LEAD SCREW TO ADJUST THE NEEDLE THREAD TENSION.
IF THE THREAD TENSION IS TOO TIGHT, TURN THE LEAD SCREW IN THE DIRECTION OF "A".
IF THE THREAD TENSION IS TOO LOOSE, TURN THE LEAD SCREW IN THE DIRECTION OF "B".
4. CHECK THE THREAD TENSION AGAIN AND REATTACH THE FACE COVER.
NEEDLE THREAD: POLYESTER
SEWING THREAD # 50 (WHITE).
PULL THE THREAD AT A SPEED OF 110 MM/SEC, IN
THE DIRECTION OF THE ARROW.
LEAD SCREW
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