Janome MyStyle 100 User manual

SERVICE MANUAL
Mystyle 100

CONTENTS
WHAT TO DO WHEN .......................................................................................... 1~3
SERVICE ACCESS
FACE COVER ........................................................................................ 4
FRONT COVER ...................................................................................... 5
REAR COVER ........................................................................................ 6
MECHANICAL ADJUSTMENT
TOP TENSION ...................................................................................... 7
PRESSER BAR HEIGHT AND ALIGNMENT ......................................... 8
NEEDLE SWING .................................................................................... 9
NEEDLE DROP POSITION .................................................................. 10
HOOK TIMING ...................................................................................... 11
NEEDLE BAR HEIGHT ........................................................................ 12
ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK POINT ............. 13
FEED DOG HEIGHT ............................................................................ 14
BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR .. 15
DISTORTED PATTERN ....................................................................... 16
BUTTONHOLE STITCH BALANCE ..................................................... 17
BARTACK FEED OF BUTTONHOLE ................................................... 18
DISENGAGEMENT OF CAM FOLLOWER .......................................... 19
MOTOR BELT TENSION ..................................................................... 20
WIRING ................................................................................................ 21
PARTSLIST ..................................................................................................... 22~37

1
What to Do When
Condition Cause How to fix Reference
1. SKipped 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 sewing needle and thread.
fabric being sewn.
5. Sewing on stretch Use a #11 blue tip needle.
fabric.
6. Presser foot pressure Adjust the presser bar
is too weak. level to make the
pressure stronger.
7. Inappropriate needle See mechanical p.12
bar height. adjustment
“Needle Bar Height”.
8. Inappropriate needle See mechanical p.11
to hook timing. adjustment
“Hook Timng”.
9. Inappropriate needle See mechanical adjustment p.13
to hook clearance. “Adjusting Clearance Between
Needle and Hook Point”.
2. Fabric not 1. Incorrect feed dog height. See mechanical p.14
moving adjustment “Feed Dog
Height”.
2. Feed dog is in down Raise the Feed dog level.
position.
3. Thread on bottom side Make sure to bring
of fabric is jammed up. both needle and bobbin
thread under the foot
when starting sewing.
4. Feed dog teeth are Change the feed dog.
worn.

2
Condition Cause How to fix Reference
3. 1. Initial sewing speed is Start with medium speed.
too fast.
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 Adjust needle thread
too strong. tension correctly.
5. Needle size is Use appropriate needle
inappropriate for fabric. for fabric and thread 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. 1. Incorrectly threaded Thread bobbin correctly.
bobbin.
2. Too much thread is Adjust the position of
on the bobbin. stopper.
3. Lint is stuck inside the Clean the shuttle.
bobbin holder.
4. Thread quality is Change to a higher quality
too low. sewing thread.
5. Thread is jamming Clear out the jamming
around the bobbin. thread.
5. Needle 1. Needle is hitting the See mechanical p.10
breaks needle plate. adjustment “Needle Drop
Position”.
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the See mechanical adjustment p.13
Hook. “Clearance between
Needle and Hook Point”.
4. The fabric moves while See mechanical p.9
the needle is piercing adjustment “Needle
it, or the needle zigzags Swing”.
while in fabric.
5. Fabric is being pulled too Guide the fabric gently
strongly while sewing. while sewing.
Needle
thread
breaks
Bobbin
thread
breaks

3
Condition Cause How to fix Reference
6. Noisy 1. Backlash between See mechanical p.15
operation the hook gear and adjustment “Backlash
lower shaft gear is too between Hook Gear and
great. Lower Shaft Gear”.
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See mechanical adjustment p.20
“Motor Belt Tension.”
4. Not enough oil. Oil all moving parts.
5. Upper shaft is loose. Eliminate the looseness.
7. Deformed 1. Inappropriate feed See mechanical adjustment p.16
pattern balance. “Distorted pattern”
2. Inappropriate zigzag See mechanical p.9
synchronization. adjustment “Needle Swing.”
3. Upper thread tension Adjust needle thread
is too strong. tension correctly.
8. 1. Buttonhole stitch See mechanical adjustment p.17
balance is not correct. “Buttonhole Stitch Blance”.
2. Changing to bar tack See mechanical adjustment p.18
is too early or will not “Bartack Feed of Buttonhole”.
work.
9. Improper 1. The pattern selector is See mechanical adjustment p.19
pattern blocked. "Disengagement of Cam
Followr".
2. The pattern selector will See mechanical adjustment p.19
not select the correct "Disengagement of Cam
pattern. Followr".
Improper
buttonhole
results

4
SERVICE ACCESS
FACE COVER
TO REMOVE:
1. REMOVE THE SETSCREWS (A).
2. TAKE THE FACE COVER (B) OFF.
TO ATTACH:
1. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(B)
(A)

5
SERVICE ACCESS
FRONT COVER
(B)
DIALS
CAP
(C)
(E)
(G)
(F)
TO REMOVE
1. REMOVE THE FACE COVER (SEE PAGE 4), AND EXTENSION TABLE.
REMOVE THE CAP, SETSCREWS (B), (D), (E), (F), (G) AND DIALS.
LOOSEN THE SETSCREW (A), (C).
REMOVE THE FRONT COVER.
TO ATTACH
2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(D)
(A)

6
SERVICE ACCESS
REAR COVER
REAR COVER
(A)
TO REMOVE
1. REMOVE THE FACE COVER AND FRONT COVER. (SEE PAGE 4, 5)
2. REMOVE THE SETSCREWS (A), (B), (C), (D) AND (E).
3. LOWER THE PRESSER FOOT LIFTER. REMOVE THE REAR COVER.
TO ATTACH
4. FOLLOW THE ABOVE PROCEDURE IN REVRSE.
(B) (C)
(E) (D)

7
MECHANICAL ADJUSTMENT
TOP TENSION
TO CHECK:
THE STANDARD UPPER THREAD TENSION SHOULD BE 75 - 90g WHEN PULLING THE
THREAD (COTTON THREAD #50) IN THE DIRECTION OF (B) WITH SETTING THE TENSION
DIAL AT “4”. (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 FACE COVER AND FRONT COVER. (SEE PAGE 4, 5.)
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 AND FACE COVER.
(C)
(E)
(D)
(B)

8
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT AND ALIGNMENT
TO CHECK:
1. RAISE THE PRESSER FOOT LIFTER (A).
2. THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (E)
SHOULD BE 6.0MM (0.24").
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER. (SEE PAGE 4.)
2. REMOVE THE SCREWS (B) AND TAKE THE LAMP SOCKET OFF.
3. RAISE THE PRESSER FOOT LEVER AND LOOSEN THE SCREW (C) ON THE PRESSER
BAR HOLDER.
ADJUST THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE
(E) TO 6.0MM (0.24").
4. TIGHTEN THE SCREW (C) SECURELY.
5. TIGHTEN THE SCREWS (B) TO SECURE THE LAMP SOCKET.
6. ATTACH THE FACE COVER.
NOTE: WHEN YOU TIGHTEN THE SCREW (C), MAKE SURE THAT BOTH SIDES OF
THE PRESSER FOOT ARE PARALLEL TO THE FEED DOG SLOTS (F) ON THE
NEEDLE PLATE.
(D)
(E)
(F)
6.0MM
(C)
(A)
(B)

9
MECHANICAL ADJUSTMENT
NEEDLE SWING
TO CHECK:
ADJUST THE NEEDLE SWING ACCORDING TO THE FOLLOWING PROCEDURE, IF THE
NEEDLE BAR STARTS MOVING SIDEWAYS WHILE THE NEEDLE IS IN THE FABRIC AT
SEWING THE ZIGZAG PATTERN (WITH MAXIMUM ZIGZAG WIDTH).
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR DIAL WITH MAXIMUM ZIGZAG WIDTH, AND REMOVE
THE FRONT COVER. (SEE PAGE 5.)
2. LOOSEN TWO SET SCREWS.
3. ADJUST THE NEEDLE SWING BY TURNING THE HANDWHEEL, WHILE HOLDING THE
WORM SO AS NOT TO ROTATE IT, UNTIL THE NEEDLE SWING STARTS AT 2 - 3MM
ON THE NEEDLE PLATE AFTER THE NEEDLE HAS COME OUT OF THE RIGHT SIDE
OF THE NEEDLE HOLE.
4. TIGHTEN TWO SET SCREWS.
5. ATTACH THE FRONT COVER.
NOTE: AFTER ADJUSTING THE NEEDLE SWING, CHECK THAT THE UPPER SHAFT
WORM AND GEAR ROTATE SMOOTHLY WITHOUT ANY BACKLASH BETWEEN
THEM.
UPPER SHAFT WORM
GEAR
SET SCREW
(2 PCS.)
2–3 MM

10
SET SCREW
BOTH CLEARANCE SHOULD BE EQUAL
MACHANICAL ADJUSTMENT
NEEDLE DROP POSITION
SET THE SELECTOR DIAL AT STRAIGHT STITCH.
THE NEEDLE DROP POSITION SHOULD BE THE CENTER OF THE NEEDLE PLATE HOLE.
SET THE SELECTOR DIAL AT ZIGZAG STITCH WITH MAXIMUM ZIGZAG WIDTH.
THE CLEARANCE BETWEEN THE NEEDLE DROP POSITION AND THE EDGE OF NEEDLE
PLATE HOLE SHOULD BE 0.2 MM OR MORE FOR BOTH SIDE.
IF NOT, MAKE ADJUSTMENT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER (SEE PAGE 4).
2. SET THE PATTERN SELECTOR DIAL AT ZIGZAG STITCH WITH MAXIMUM WIDTH.
3. LOOSEN THE SETSCREW.
MOVE THE NEEDLE BAR SUPPORTER TO ADJUST THE NEEDLE DROP POSITION IN THE
CENTER OF THE NEEDLE HOLE.
4. ATTACH THE FACE COVER.

11
MACHANICAL ADJUSTMENT
HOOK TIMING
SET THE PATTERN SELECTOR DIAL AT ZIGZAG STITCH WITH MAXIMUM ZIGZAG WIDTH.
THE AMOUNT OF ASCENDING TRAVEL OF THE NEEDLE BAR FROM ITS LOWER POSITION
TO THE POSITION WHERE THE TIP OF THE ROTARY HOOK EXACTLY MEETS THE RIGHT
SIDE OF THE NEEDLE SHOULD BE 1.4 - 2.0 MM.
1. SET THE PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG WIDTH.
BRING THE NEEDLE AT RIGHT LOWEST NEEDLE POSITION.
2. REMOVE THE SETSCREW ON THE NEEDLE PLATE, THE NEEDLE PLATE AND THE
BOBBIN HOLDER.
3. LOOSEN THE HEXAGONAL SOCKET SCREWS ON THE LOWER SHAFT GEAR.
4. TURN THE HANDWHEEL TOWARD YOU TO RAISE THE NEEDLE BAR 1.7 MM FROM ITS
RIGHT LOWEST POSITION.
5. WHILE HOLDING THE HANDWHEEL TO PREVENT THE NEEDLE BAR FROM MOVING,
TURN THE LOWER SHAFT GEAR IN THE DIRECTION OF ARROW UNTIL THE TIP OF THE
ROTARY HOOK EXACTLY MEETS THE RIGHT SIDE OF THE NEEDLE.
6. TIGHTEN THE HEXAGONAL SOCKET SCREWS ON THE LOWER SHAFT GEAR.
7. ATTACH THE BOBBIN HOLDER, NEEDLE PLATE.
HEXAGONAL SOCKET SCREWS
NEEDLE PLATE SETSCREW
NEEDLE PLATE
BOBBIN HOLDER
THE POINT OF THE ROTARY HOOK
EXACTLY MEETS AT THE RIGHT SIDE
OF THE NEEDLE POINT
NEEDLE IS SET AT RIGHT
NEEDLE POSITION
1.4 ~ 2.0 mm
LOWEST NEEDLE POSITION

12
NEEDLE PLATE SETSCREW
NEEDLE PLATE
BOBBIN HOLDER
MECHANICAL ADJUSTMENT
NEEDLE BAR HEIGHT
TO CHECK:
THE STANDARD DISTANCE BETWEEN THE UPPER EDGE OF THE NEEDLE EYE AND THE
UPPER SURFACE OF THE HOOK RACE SHOULD BE IN THE RANGE OF 3.0~3.6 MM WHEN
THE HOOK POINT MEETS THE RIGHT SIDE OF THE NEEDLE IN ITS ASCENDING TRAVEL
FROM THE RIGHT LOWEST POSITION OF THE MAXIMUM WIDTH ZIGZAG STITCH.
ADJUSTMENT PROCEDURE:
1. SELECT THE ZIGZAG STITCH WITH MAXIMUM STITCH WIDTH.
BRING THE NEEDLE TO THE RIGHT LOWEST POSITION.
2. REMOVE THE FACE COVER, FRONT COVER AND REAR COVER. (SEE PAGE 4~6).
3. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
4. TURN THE HANDWHEEL TOWARD YOU UNTIL THE HOOK POINT MEETS THE RIGHT
SIDE OF THE NEEDLE.
5. LOOSEN THE SETSCREW AND MOVE THE NEEDLE BAR UP OR DOWN TO ADJUST
THE NEEDLE HEIGHT.
NOTE: BE CAREFUL NOT TO ROTATE THE NEEDLE BAR.
6. TIGHTEN THE SETSCREW.
7. ATTACH THE BOBBIN HOLDER, NEEDLE PLATE AND FACE COVER.
NOTE:
BEFORE PERFORMING THIS ADJUSTMENT, CHECK THE NEEDLE TO HOOK TIMING.
HOOK RACE UNIT
NEEDLE ALIGNMENT
UPPER SURFACE OF
HOOK RACE
3.0-3.6 MM
UPPER EDGE OF
NEEDLE EYE
SETSCREW

13
MECHANICAL ADJUSTMENT
ADJUSTING CLEARANCE BETWEEN NEEDLE AND HOOK POINT
THE STANDARD CLEARANCE BETWEEN THE NEEDLE AND HOOK POINT SHOULD BE
–0.10 TO + 0.05 MM.
TO ADJUST:
1. REMOVE THE FACE COVER (SEE PAGE 4).
2. SELECT THE ZIGZAG STITCH WITH MAXIMUM STITCH WIDTH.
BRING THE NEEDLE TO THE RIGHT POSITION.
3. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER. REPLACE THE NEEDLE WITH
THE TEST PIN AND TIGHTEN THE NEEDLE CLAMP SCREW.
4. LOOSEN THE SETSCREWS A(2 PCS) AND MOVE THE PRESSER BAR BASE PLATE IN
THE DIRECTION OF THE ARROWS (C OR B). THE CLEARANCE BETWEEN THE
NEEDLE AND HOOK SHOULD BE 0~0.15 MM. THIGHTEN THE SCREWS.
• MOVE THE PRESSER BAR BASE PLATE IN THE DIRECTION OF B WHEN THE
CLEARANCE IS TOO LARGE.
• MOVE THE PRESSER BAR BASE PLATE IN THE DIRECTION OF C WHEN THE
CLEARANCE IT TOO SMALL.
* THE EDGE OF PRESSER BAR BASE PLATE SHOULD ALWAYS TOUCHES THE
BOSSES WHILE ADJUSTING THE CLEARANCE IT.
5. ATTACH THE FACE COVER.
NOTE: AFTER THIS ADJUSTMENT, CHECK IF THE CLEARANCE BETWEEN NEEDLE
AND NEEDLE PLATE IS MORE THAN 0.15MM AS SHOWN.
NEEDLE PLATE SETSCREW
NEEDLE PLATE
BOBBIN HOLDER
DIRECTION C
DIRECTION B
SETSCREW A (2 PCS.)
BOSSES
NEEDLE CLAMP SCREW
TEST PIN
HOOK POINT
-0.10 to +0.05 mm

14
MECHANICAL ADJUSTMENT
FEED DOG HEIGHT
TO CHECK:
1. LOWER THE PRESSER FOOT.
2. TURN THE HANDWHEEL TOWARD YOU UNTIL THE FEED DOG COMES TO ITS
HIGHEST POSITION. THE DISTANCE BETWEEN THE FEED DOG AND THE UPPER
SURFACE OF THE NEEDLE PLATE SHOULD BE 0.8–0.95 MM.
IF IT IS NOT IN THE RANGE, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:
1. SELECT THE STRATIGHT STITCH.
2. LOOSEN THE SCREW (A) .
3. TURN THE HANDWHEEL TO BRING THE FEED DOG TO ITS HIGHEST POSITION.
4. IF THE FEED DOG HEIGHT IS LOWER THAN 0.8 MM: TURN ADJUSTING SCREW (B)
IN THE DIRECTION OF (C).
5. IF THE FEED DOG HEIGHT IS HIGHER THAN 0.95 MM: TURN THE ADJUSTING
SCREW (B) IN THE DIRECTION OF (D).
6. TIGHTEN THE SETSCREW (A).
0.8–0.95 MM
UPPER SURFACE OF
THE NEEDLE PLATE
(C) (D)
(A)
(B)

15
MECHANICAL ADJUSTMENT
BACKLUSH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR
TO CHECK:
1. THE ROTARY PLAY OF THE HOOK POINT SHOULD BE 0.8 MM OR LESS WHEN IT IS
IN BETWEEN THE SPAN OF THE FEED DOG TEETH, AND THE GEARS SHOULD
TURN SMOOTHLY.
ADJUSTMENT PROCEDURE:
1. REMOVE THE NEEDLE PLATE AND BOBBIN HOLDER.
2. REMOVE THE FRONT COVER (SEE PAGE 5.)
3. LOOSEN THE SETSCREW (E).
4. IF THE ROTARY PLAY IS TOO LARGE, TURN THE LOWER SHAFT BUSHING IN THE
DIRECTION OF (C).
5. IF THE ROTARY PLAY IS TOO SMALL, TURN THE LOWER SHAFT BUSHING IN THE
DIRECITON OF (D).
6. TIGHTEN THE SETSCREW (E).
7. ATTACH THE FRONT COVER.
8. ATTACH THE BOBBIN HOLDER AND NEEDLE PLATE.
NEEDLE PLATE SETSCREW
NEEDLE PLATE
BOBBIN HOLDER SETSCREW (E)
LOWER SHAFT BUSHING
(C)
(D)
NOTCH
SPAN OF FEED DOGS
HOOK POINT
0.8 MM OR LESS

16
(C) (D)
STRECH STITCH
ADJUSTING SCREW
MECHANICAL ADJUSTMENT
DISTORTED PATTERN
TO CHECK:
IF THE STRETCH STITCH PATTERNS ARE DISTORTED WITH SETTING THE STITCH
LENGTH CONTROL AT “ S.S. ”.
(IN CASE OF BEING A DIFFERENCE BETWEEN FORWARD FEEDING AND BACKWARD
FEEDING DURING STRETCH STITCH PATTERNS), MAKE AN ADJUSTMENT AS
FOLLOWS:
ADJUSTMENT PROCEDURE:
1. RAISE THE CARRYING HANDLE.
2. SET THE PATTERN SELECTOR CONTROL AT “ A ”, AND THE STITCH LENGTH
CONTROL AT “ S.S. ”.
3. TURN THE STRETCH STITCH ADJUSTING SCREW IN THE DIRECTION OF (C)
WHEN A > B, OR IN THE DIRECTION OF (D) WHEN A < B.

17
BUTTONHOLE STITCH BALANCE
WHEN SEWING BUTTONHOLES, THE STITCHES ON EACH SIDE OF THE BUTTONHOLE
SHOULD HAVE THE SAME STITCH DENSITY.
THE RANGE OF 9 - 11 STITCHES IN THE RIGHT SIDE ROW AGAINST 10 STITCHES IN THE
LEFT SIDE ROW CONSIDERED ACCEPTABLE.
1. SEW A BUTTONHOLE AND CHECK BOTH RIGHT AND LEFT ROW STITCH DENSITIES.
2. IF THE LEFT SIDE ROW IS DENSER THAN THE RIGHT SIDE ROW (A), TURN THE
ADJUSTING SCREW COUNTERCLOCKWISE (IN THE DIRECTION OF C).
IF THE RIGHT SIDE ROW IS DENSER THAN THE LEFT SIDE ROW (B), TURN THE
ADJUSTING SCREW CLOCKWISE (IN THE DIRECTION OF D).
MECHANICAL ADJUSTMENT
AB
CD

18
MECHANICAL ADJUSTMENT
BARTACK FEED OF BUTTONHOLE
TO CHECK:
IF THE MATERIAL IS FEED FORWARD OR BACKWARD WHEN SEWING BARTACK ON
BUTTONHOLE, MAKE AN ADJUSTMENT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. SET THE PATTERN SELECTOR CONTROL AT “ ” AND THE STITCH LENGTH
CONTROL AT “4”.
2. REMOVE THE FRONT COVER. (SEE PAGE 5.)
3. PLACE A PIECE OF PAPER UNDER THE FOOT AND TURN THE HANDWHEEL.
IF THE PAPER IS FED FORWARD, TURN THE ADJUSTING SCREW IN THE
DIRECTION OF (C).
IF THE PAPER IS FED BACKWARD, TURN THE ADJUSTING SCREW IN THE
DIRECTION OF (D).
4. MOUNT THE FRONT COVER.
FORWARD FEEDING
BACKWARD FEEDING
(D) (C)
ADJUSTING SCREW