Janome DC 3018 User manual

SERVICING MANUAL
DC3018 & DC3050

CONTENTS
WHAT TO DO WHEN....................................................................................................................... 1 - 3
FACE COVER ........................................................................................................................................ 4
BED COVER .......................................................................................................................................... 5
FRONT COVER ................................................................................................................................ 6 - 7
REAR COVER ....................................................................................................................................... 8
PRESSER BAR HEIGHT AND ALIGNMENT......................................................................................... 9
NEEDLE DROP POSITION ................................................................................................................. 10
NEEDLE BAR HEIGHT........................................................................................................................ 11
NEEDLE TO HOOK TIMING ................................................................................................................ 12
NEEDLE CLEARANCE TO SHUTTLE ................................................................................................ 13
BACKLASH (BETWEEN LOWER SHAFT GEAR AND SHUTTLE HOOK GEAR) .............................. 14
FEED DOG HEIGHT............................................................................................................................ 15
ZIGZAG SYNCHRONIZATION ............................................................................................................ 16
NEEDLE THREAD TENSION .............................................................................................................. 17
STRETCH STITCH FEED BALANCE.................................................................................................. 18
REPLACEMENT AND ADJUSTMENT OF NEEDLETHREADER PLATE........................................... 19
CONNECTOR CONNECTION DIAGRAM ........................................................................................... 20
REPLACINGTHE PRINTED CIRCUIT BOARD “A” ............................................................................ 21
REPLACINGTHE SLIDE VOLUME AND PRINTED CIRCUIT BOARD “F” ........................................ 22
REPLACING THE DC MOTOR AND ADJUSTING THE MOTOR BELT TENSION ............................. 23
REPLACING THE FUSE...................................................................................................................... 24
REPLACINGTHE MACHINE SOCKET................................................................................................25
REPLACING THE TRANSFORMER ....................................................................................................26
REPLACDING THE ZIGZAG MOTOR .................................................................................................27
REPLACING THE FEED MOTOR .......................................................................................................28
ADJUSTING THE BUTTONHOLE LEVER ...........................................................................................29
ADJUSTING THE BOBBIN WINDER SWITCH ....................................................................................30
OILING ..................................................................................................................................................31

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 SHUTTLE TIMING.
9. INAPPROPRIATE NEEDLE
TO SHUTTLE 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 SHUTTLE TIMING”.
SEE MECHANICAL ADJUSTMENT
“CLEARANCE BETWEEN NEEDLE
AND HOOK”.
P. 11
P. 12
P. 13
2.FABRIC NOT
MOVING 1. PRESSER FOOT PRESSURE IS TOO WEAK.
2. INCORRECT F.D. HEIGHT.
3.F.D. IS IN DOWN POSITION.
4.THREAD ON BOTTOM SIDE
OF FABRIC IS JAMMED UP.
5.FEED DOGTEETH AREWORN.
ADJUST THE PRESSER BAR
LEVEL TO MAKE THE
PRESSURE STRONGER.
SEE MECHANICAL
ADJUSTMENT “FEED DOG HEIGHT”.
RAISE THE F.D. LEVEL.
MAKE SURE TO BRING BOTH
NEEDLE AND BOBBINTHREAD UNDER
THE FOOT WHEN STARTING SEWING.
CHANGE THE FEED DOG.
P. 15
WHAT TO DO WHEN
1

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.
REPLACEWITH 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. 17
4. BREAKING
BOBBIN
THREAD
1. INCORRECITLY THREADED
BOBBIN.
2.TOO MUCH THREAD IS
AROUND ONTHE 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 JAMMINGTHREAD.
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 DROP
POSITION”.
CHANGE THE NEEDLE.
SEE MECHANICAL ADJUSTMENT
“CLEARANCE BETWEEN NEEDLE
AND HOOK”.
SEE MECHANICAL ADJUSTMENT
“ZIGZAG SYNCHRONIZATION”.
GUIDE THE FABRIC GENTLY
WHILE SEWING.
P. 10
P. 13
P. 16
2

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. 14
P. 26
P. 34
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. 18
P. 16
P. 17
3

Setscrew (B)
Cap (A)
Face cover
SERVICE ACCESS (1)
Ribs (E)
Hook (D)
FACE COVER
TO REMOVE:
1. REMOVE THE CAP (A).
2. REMOVE THE SETSCREW (B) AND REMOVE THE FACE COVER (C).
TO INSTALL:
3. INSERT THE HOOK (D) AND RIBS (E) OF THE FACE COVER INTO THE REAR COVER AND TIGHTEN
THE SETSCREW, THEN ATTACH THE CAP.
4

BED COVER
SETSCREW (B)
2 SETSCREWS (B)
DROP LEVER (A) BED COVER (C)
SERVICE ACCESS (2)
TO REMOVE:
1. SET THE DROP LEVER (A) TO THE LEFT AND REMOVE THE 3 SETSCREWS (B).
REMOVE THE BED COVER (C).
TO INSTALL:
2. SET THE DROP LEVER (A) TO THE LEFT AND INSTALL THE BED COVER (C).
SECURE IT IN PLACE WITH THE 3 SETSCREWS (B).
5

SERVICE ACCESS (3-1)
SETSCREW (C)
SETSCREW (B)
SETSCREW (A)
SETSCREW (F)
SETSCREW (E)
SETSCREW (D)
FRONT COVER
SETSCREW (G) MACHINE SOCKET
(CONNECTOR ON
THE PCB)
POWER
TRANSFORMER
(CONNECTOR ON
THE PCB)
SETSCREW (H)
TO REMOVE:
1. REMOVE THE FACE COVER AND BED COVER (SEE PAGES 7 AND 8).
2. LOOSEN THE SETSCREWS (A), THEN REMOVE THE SETSCREWS (B), (C), (D), (E), (F), (G) AND (H).
3. REMOVE THE FRONT COVER (SEE PAGE 10) AND DISCONNECT EACH SWITCH CONNECTORS.
NOTES
TO DISCONNECT THE CONNECTORS:
1. GRASP THE CONNECTOR DIRECTLY WITH YOUR FINGERS AND PULL. DO NOT PULL ON THE LEAD
WIRE, AS THIS MAY DAMAGE THE CONTACT SLEEVE INSIDE THE CONNECTOR.
2. WHEN DISCONNECTING THE MACHINE SOCKET AND POWER TRANSFORMER
CONNECTORS, PULL THEM WHILE PUSHING THEM TOWARD THE PRINTED CIRCUIT BOARD A TO
UNLOCK THEM.
TO INSTALL:
TO INSTALL THE FRONT COVER, FOLLOW THE ABOVE PROCEDURE IN REVERSE.
NOTES: TO CONNECT THE CONNECTORS:
1. BE SURE THAT THE COLOR OF EACH CONNECTOR CORRESPONDS TO THE COLOR OF THE
CONNECTOR POST ON THE PRINTED CIRCUIT BOARD (PCB) TO WHICH IT IS CONNECTED.
2. INSERT THE CONNECTOR AT THE RIGHT ANGLE. THEN PUSH IT STRAIGHT DOWN UNTIL IT LOCKS
IN PLACE.
6

SERVICE ACCESS (3-2)
FRONT COVER
FEED BALANCE DIAL KNOB
MACHINE PLUG
SETSCREW (F) SETSCREW (G)
Hook
1. UNFASTEN THE FRONT AND REAR COVER HOOKS AND THE BOTTOM SIDE HOOK AS SHOWN.
2. PULL THE FRONT COVER TO CLEAR OF THE FEED BALANCING KNOB.
3. PULL THE FRONT COVER TO CLEAR OF THE MACHINE SOCKET AND REMOVE THE FRONT COVER.
* REMOVE THE SETSCREWS (F) AND (G) ON THE REAR COVER TO FACILITATE CLEARANCE OF THE
FRONT COVER FROM THE MACHINE SOCKET.
7

SETSCREW (A)
SETSCREW (B)
REAR COVER
SERVICE ACCESS (4)
PRESSER
FOOT LIFTER
SETSCREW (C)
TO REMOVE:
1. REMOVE THE FRONT COVER (SEE PAGE 6 AND 7).
2. REMOVE SETSCREWS (A), (B) AND (C), THEN REMOVE THE REAR COVER.
* TO REMOVE THE COVER, DETACH THE PRESSER FOOT LIFTER SECTION FIRST, WITH THE
PRESSER FOOT LIFTER IN THE DOWN POSITION.
TO INSTALL:
3. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
8

PRESSER BAR HEIGHT AND ALIGNMENT
WHEN THE PRESSER FOOT IS RAISED, THE CLEARANCE BETWEEN THE PRESSER FOOT AND THE
NEEDLE PLATE SHOULD BE 6.0 MM.
WHEN THE PRESSER FOOT IS LOWERED, THE EDGE OF THE FOOT AND THE FEED DOG WINDOW ON
THE NEEDLE PLATE SHOULD BE PARALLEL.
1. REMOVE THE FACE COVER AND RAISE THE PRESSER FOOT.
LOOSEN THE SETSCREW TO ADJUST THE PRESSER FOOT HEIGHT (6.0 MM) AND THE PRESSER FOOT
ALIGNMENT.
2. TIGHTEN THE SETSCREW FIRMLY.
3. INSTALL THE FACE COVER.
PRESSER BAR LIFTER
SETSCREW 4 X 8
PRESSER FOOT
6.0 MM
A
NEEDLE PLATE
[HEIGHT OF PRESSER FOOT]
[PRESSER FOOT ALIGNMENT]
SHOULD BE
PARALLEL
FEED DOG
MECHANICAL ADJUSTMENT
9

MECHANICAL ADJUSTMENT
ECCENTRIC PIN
SETSCREW 3 X 4
NEEDLE PLATE HOLE
0.2 MM OR
MORE
0.2 MM OR
MORE
A=B
NEEDLE DROP POSITION
SET THE STITCH PATTERN AT " "; THE STANDARD NEEDLE DROP POSITION SHOULD BE AT THE
CENTER OF THE NEEDLE PLATE HOLE.
WHEN THE NEEDLE SWINGS IN MAXIMUM ZIGZAG WIDTH " ", THE DISTANCE BETWEEN BOTH
ENDS OF THE NEEDLE HOLE ON THE NEEDLE PLATE AND THE NEEDLE SHOULD BE 0.2 MM OR
MORE. IF NOT, ADJUST AS FOLLOWS.
1. TURN ON THE POWER SWITCH, SET THE STITCH PATTERN AT STRAIGHT " " 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
MAKE SURE THE ECCENTRIC PIN IS POSITIONED WITH ITS OFF-CENTER HEAD FACING DOWNWARD.
3. WHEN YOU HAVE FINISHED ADJUSTING THE NEEDLE DROP POSITION, TIGHTEN THE SETSCREW
AND INSTALL THE FACE COVER.
ADJUSTMENT PROCEDURE
ECCENTRIC PIN POSITION
(OFF -CENTER HEAD)
ADJUST THE NEEDLE DROP POSITION BY
TURNING THE ECCENTRIC PIN AS
10

MECHANICAL ADJUSTMENT
SETSCREW (A)
NEEDLE SETTING GROOVE
TIP OF HOOK MEETS RIGHT
SIDE OF NEEDLE
NEEDLE #14 HOOK RACE
1.6-2.0 MM
UPPER EDGE OF
NEEDLE EYE
HOOK RACE UNIT
NEEDLE BAR HEIGHT
THE DISTANCE BETWEEN THE UPPER EDGE OF NEEDLE EYE AND THE TIP OF THE HOOK SHOULD BE
IN THE RANGE OF 1.6-2.0 MM WHEN THE TIP OF HOOK MEETS THE RIGHT SIDE OF THE NEEDLE IN
ASCENDING TRAVEL OF NEEDLE FROM ITS LEFT AND LOWEST POOSITION.
1. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
TURN ON THE POWER SWITCH.
3. SELECT THE PATTERN (SIMPLE ZIGZAG). (MAXIMUM ZIGZAG WIDTH)
4. TURN THE HANDWHEEL TOWARD YOU UNTIL THE TIP OF HOOK MEETS THE RIGHT SIDE OF THE
NEEDLE.
5. LOOSEN THE SETSCREW (A).
6. ADJUST THE HEIGHT OF THE NEEDLE BAR BY MOVING THE NEEDLE BAR UPWARD OR DOWNWARD
WITHOUT TURNING IT. (MAKE SURE THAT THE NEEDLE SETTING GROOVE OF THE NEEDLE BAR IS IN
THE FRONT).
7. TIGHTEN THE SETSCREW (A).
8. INSERT THE BOBBIN HOLDER, THEN ATTACH THE NEEDLE PLATE.
11

LOWER SHAFT GEAR
MECHANICAL ADJUSTMENT
WHEN THE MACHINE IS SET THE STRAIGHT STITCH PATTERN NO.2 ( LEFT NEEDLE POSITION), THE
AMOUNT OF ASCENDING TRAVEL OF THE NEEDLE BAR FROM ITS LOWEST POSITION TO THE POSITION
WHERE THE TIP OF THE HOOK MEETS THE RIGHT SIDE OF THE NEEDLE SHOULD BE 3.25 - 3.55 MM.
1.REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
2.TURN ON THE POWER SWITCH, SET THESTRAIGHT STITCH PATTERN NO.2 (LEFT
NEEDLE POSITION).
3.REMOVE THE BED COVER.
4.TURN THE HANDWHEEL TOWARD YOU, AND SET THE NEEDLE BAR AT THE LOWEST
POSITION.
5.LOOSEN THE SETSCREWS ON THE LOWER SHAFT TIMING GEAR.
6.RAISE THE NEEDLE BAR BETWEEN 3.25 - 3.55 MM FROM THE LOWEST POSITION OF
THE NEEDLE BAR.
7.TURN THE LOWER SHAFT TIMING GEAR UNTIL THE TIP OF HOOK MEETS WITH THE
RIGHT SIDE OF NEEDLE.
8.TIGHTEN THE SETSCREWS ON THE LOWER SHAFT TIMING GEAR.
9.ATTACH THE BED COVER, BOBBIN HOLDER AND NEEDLE PLATE.
MATCH THE TIP OF
HOOK AT THE RIGHT
SIDE OF NEEDLE
NEEDLE #14
3.25–3.55 MM
LOWER NEEDLE POSITION
SETSCREW
NEEDLE TO HOOK TIMING
12

PREPARATION:
1. REMOVE THE NEEDLE PLATE, BOBBIN HOLDER, AND BED COVER, AND REPLACE THE NEEDLE
WITH THE TEST PIN (D).
2. TURN THE POWER SWITCH ON, AND SELECT PATTERN " " (SIMPLOE ZIGZAG). (MAXIMUM
ZIGZAG WIDTH)
ADJUSTMENT PROCEDURE:
1. LOOSEN THE SCREWS (A), (B), (C), THEN SLIGHTLY TIGHTEN THE HING SCREW(C).
2. TURN THE HANDWHEEL TOWARD YOU, AND ADJUST THE CLEARANCE BETWEEN MASTER
NEEDLE AND THE POINT OF THE HOOK IN THE LEFT AND RIGHT NEEDLE POSITION TO –0.1
TO +0.05 MM BY MOVING THE HOOK IN THE LEFT AND RIGHT BY MOVING THE HOOK SET
PLATE UP OR DOWN.
3. TIGHTEN THE SETSCREWS (A), (B), (C).
4. CHECK THE BACKLASH OF THE HOOK DRIVE, GEAR AND LOWER SHAFT GEAR. IF THE
BACKLASH IS TOO GREAT OR NOT ENOUGH, ADJUST THE BACKLASH IN ACCORDANCE WITH
"TO ADJUST THE BACKLASH OF HOOK DRIVE GEAR AND LOWER SHAFT GEAR".
5. ATTACH THE BED COVER, NEEDLE PLATE AND BOBBIN HOLDER, AND REMOVE THE MASTER
NEEDLE.
MECHANICAL ADJUSTMENT
NEEDLE CLEARANCE TO SHUTTLE
THE CLEARANCE BETWEEN THE NEEDLE AND THE TIP OF HOOK SHOULD BE -0.1 TO +0.05 MM.
HINGE SCREW (C)
SETSCREW (B)
HOOK SET PLATE (E)
SETSCREW (A)
TEST PIN (D)
POINT OF HOOK
–0.1 to +0.05 MM
13

MECHANICAL ADJUSTMENT
BACKLASH (BETWEEN LOWER SHAFT GEAR AND SHUTTLE HOOK GEAR)
JOG THE HOOK RACE BACK AND FORTH TO CHECK ROTARY PLAY.
THE STANDARD PLAY SHOULD BE 0.8 MM (0.03") OR LESS WHEN THE HOOK POINT IS WITHIN THE
FEED DOG WODTH. IF PLAY EXCESS 0.8 MM, ADJUST AS FOLLOWS.
ADJUSTMENT:
1. REMOVE THE BED COVER (SEE PAGE 5).
2. LOOSEN THE SETSCREW.
3. TURN THE LOWER SHAFT BUSHING (ECCENTRIC BUSHING) CLOCKWISE (B) IF THERE IS TOO
MUCH PLAY IN THE SHUTTLE HOOK.
TURN THE LOWER SHAFT BUSHING (ECCENTRIC BUSHING) COUNTERCLOCKWISE (A) IF THERE
IS TOO LITTLE PLAY IN THE SHUTTLE HOOK.
4. TIGHTEN THE SETSCREW SECURELY AFTER ADJUSTMENT AND INSTALL THE BED COVER.
NOTE
AFTER ADJUSTING THE BACKLASH, BE SURE TO CHECK THE NEEDLE TO SHUTTLE TIMING
AND THE FEED DOG HEIGHT.
BACKLASH ALLOWANCE
POINT OF
SHUTTLE HOOK
CHECK THE
BACKLASH
GROOVE
GROOVE ON THE LOWER
SHAFT BUSHING
LOWER SHAFT GEAR
A
B
SETSCREW
SHUTTLE HOOK GEAR
14

MECHANICAL ADJUSTMENT
THE HIGHEST POSITION OF THE FEED DOG SHOULD BE BETWEEN 0.8 TO 0.9 MM
FROM THE SURFACE OF THE NEEDLE PLATE WHEN THE PRESSURE DIAL IS SET
AT "3" AND THE PRESSER FOOT IS RAISED.
1. SET THE PRESSURE DIAL AT "3" AND LOWER THE PRESSER FOOT.
2. TURN ON THE POWER SWITCH.
3. REMOVE THE BED COVER.
4. TURN THE HANDWHEEL TOWARD YOU TO SET THE FEED DOG AT THE HIGHEST
POSITION.
5. LOOSEN THE SETSCREW(A) AND NUT(B).
6. ADJUST THE FEED DOG HEIGHT BY TURNING THE ADJUSTING SCREW (C).
7. TIGHTEN THE NUT (B) AND SETSCREW (A).
E (TO RAISE)
D
(TO LOWER)
ADJUSTING SCREW (C)
NUT (B)
SETSCREW (A)
PRESSER FOOT
FEED DOG
0.80-0.90 MM
SURFACE OF THE
NEEDLE PLATE
15

MECHANICAL ADJUSTMENT
1. REMOVE THE FRONT COVER (REFER TO PAGE 6-7).
2. TURN ON THE POWER SWITCH, SELECT THE PATTERN NO. 2 AND SET THE MACHINE AT THE
MAXIMUM ZIGZAG WIDTH.
3. TURN THE HANDWHEEL TOWARD YOU SLOWLY WITH YOUR HAND UNTIL THE NEEDLE START TO
SEWING. LOOSEN THE SETSCREW AND TURN THE UPPER SHAFT SHIELD PLATE IN THE DIRECTION
OF;
* A. IF THE SWING POINT IS HIGHER THAN 7.5 MM.
* B . IF THE SWING POINT IS LOWER THAN 6.3 MM.
4. POSITION THE UPPER SHAFT SHIELD PLATE AS CLOSE AS POSSIBLE TO THE LEFT.
(IT SHOULD NOT TOUCH THE UPPER SHAFT SENSOR).
5. CHECK THE SWING POINT BY TURNING THE HANDWHEEL, THEN TIGHTEN THE SETSCREW.
6. ATTACH THE FRONT COVER.
ZIGZAG SYNCHRONIZATION
THE NEEDLE SHOULD START SWING BETWEEN 6.3 TO 7.5 MM ABOVE THE SURFACE
OF THE NEEDLE PLATE WHEN THE MACHINE IS SET FOR ZIGZAG STITCHING.
NEEDLE #14
6.3–7.5 MM
SURFACE OF NEEDLE PLATE
A
B
UPPER SHAFT SHIELD PLATE SETSCREW
UPPER SHAFT
SENSOR
16

MECHANICAL ADJUSTMENT
THREAD (POLYESTER
SEWING THREAD (#50
WHITE)) @
PULL THE THREAD AT A SPEED OF
APPROX. 110 MM/SEC. IN THE DIRECTION
OF ARROW. SHAFT
THE STANDARD TENSION SHOULD BE 75 TO 90 GRAMS WHEN THE TENSION DIAL IS SET AT "A" (AUTO),
MEASURED WITH A #50 WHITE POLYESTER THREAD BEING PULLED AT APROXIMATELY 110 MM/SEC.
IF THE TENSION IS OUTSIDE THE STANDARD RANGE, ADJUST AS FOLLOWS:
ADJUSTMENT:
1. SET THE THREAD TENSION DIAL TO "A" AND CHECK THE THREAD TENSION.
2. REMOVE THE FACE COVER (SEE PAGE 4).
3. IF THE TENSION IS OUTSIDE THE STANDARD RANGE, TURN THE DIAL TO FIND A POSITION WHERE
THE CORRECT TENSION IS OBTAINED.
4. INSERT A SCREWDRIVER INTO THE SLIT ON THE SHAFT AND PUSH IT UNTIL THE TENSION DIAL IS
DISENGAGED FROM THE SHAFT.
5. WHILE HOLDING THE SHAFT IN PLACE WITH THE SCREWDRIVER, TURN THE DIAL BACK TO POSITION
"A" AND ENGAGE IT WITH THE SHAFT.
6. REMOVE THE SCREWDRIVER.
7. CHECK THE THREAD TENSION TO CONFIRM THAT IT IS CORRECT, THEN INSTALL THE FACE COVER.
NEEDLE THREAD TENSION
SET THE THREAD TENSION
DIAL (AT AUTO)
17

STRETCH STITCH FEED BALANCE
WHEN A STRETCH STITCH PATTERN IS SEWN WITH THE FEED BALANCING DIAL POSITION SET AT
THE STANDARD SETTING MARK " ", THE STITCH PATTERN SHOULD LOOK LIKE THE ONE MARKED
WITH A " " (A=B) IN THE DIAGRAM BELOW.
IF FORWARD AND BACKWARD FEEDING IS UNBALANCED (A.B OR A,B), ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:
1. TURN THE POWER SWITCH ON AND SELECT THE STITCH PATTERN " ".
2. SET THE SLIT OF THE FEED BALANCING DIAL TO THE STANDARD SETTING MARK " " ON THE
FRONT COVER.
3. PUT A PIECE OF PAPER UNDER THE PRESSER FOOT AND LOWER IT.
TURNING THE HANDWHEEL TOWARD YOU, AND CHECK THE NEEDLE MARK AT "A" AND "B".
4. REMOVE THE CAP.
5. IF A>B, TURN THE ADJUSTING SCREW COUNTERCLOCKWISE "C".
6. WHEN A<B, TURN THE ADJUSTING SCREW CLOCKWISE "D".
7. ATTACH THE CAP.
£
£
MECHANICAL ADJUSTMENT
G
FADJUSTING
SCREW
CAP
FEED BALANCING DIAL
INDICATION LINE
STANDARD
SETTING MARK
18