Janome MS5027PR User manual

SERVICE MANUAL
SEWING MACHINE MODEL
MS5027PR

CONTENTS
LOCATE AND IDENTIFYTHE PARTS ......................................................................... 1
WHAT TO DO WHEN .................................................................................................. 2-4
THREADING OF MACHINE ....................................................................................... 5-6
SERVICE ACCESS
FACE COVER....................................................................................................... 7
TOP COVER......................................................................................................... 7
BASE PLATE ........................................................................................................ 8
BED COVER......................................................................................................... 8
BELT COVER ....................................................................................................... 9
FREE ARM COVER ............................................................................................. 9
FRONT COVER.................................................................................................... 10
REAR PANEL ....................................................................................................... 11
MECHANICAL ADJUSTMENT
TOP TENSION...................................................................................................... 12
PRESSER BAR HEIGHT AND ALIGNMENT....................................................... 13
NEEDLE SWING .................................................................................................. 14
STRAIGHT STITCHING .................................................................................. 15-16
DISTRIBUTION OF NEEDLE SWING............................................................. 17-18
STRETCH STITCH BALANCE........................................................................ 19-20
FEED DOG HEIGHT ................................................................................................ 21
NEEDLE BAR HEIGHT ........................................................................................ 22
NEEDLE TO HOOK TIMING................................................................................. 23
NEEDLE CLEARANCE TO HOOK ....................................................................... 24
BACKLASH (LOWER SHAFT GEAR) .................................................................. 25
BUTTONHOLE STITCH BALANCE ................................................................ 26-27
NEEDLE POSITION ........................................................................................ 28-29
ZERO FEEDING.............................................................................................. 30-31
BASIC NEEDLE POSITION ................................................................................. 32
BUTTONHOLE FUNCTION (1) ............................................................................ 33
BUTTONHOLE FUNCTION (2) ............................................................................ 34
REPLACEMENT AND ADJUSTMENT OF NEEDLE THREADER PLATE ........... 35
MOTOR BELT TENSION ...................................................................................... 36
OILING.......................................................................................................................... 37
WIRING OFTERMINAL BLOCK.................................................................................. 38
SPECIALTOOLS REQUIRED...................................................................................... 39
PARTS LIST............................................................................................................. 40-61

1
MS5027PR
LOCATE AND IDENTIFY THE PARTS
Snap-on Button
Nomenclature Plate
Needle Clamp
Presser Foot
Thumb Screw
Presser Foot
Reverse Stitch Control
Extension Table (Accessory Storage Box)
Upper Thread Guide
Take-up Lever
Top Tension Control
Face Cover Plate
Thread Cutter
Needle Plate
Hook Cover Plate
Hook Cover Plate Release Button
Spool Pin Bobbin Winding Spindle
Stitch Width Control
Stitch Length Setting Display
Stitch Length Control
Buttonhole Pitch Balance Adjusting Lever
Carrying Handle
Presser Foot Lever
Free Arm
Drop Feed Lever
Machine Socket
Power Switch
Stretch Stitch Adjuster
Buttonhole Lever
Needle Threader
Stitch Width Setting Display
Handwheel
Stitch Selector

2
MS5027PR
WHAT TO DO WHEN
CONDITION CAUSE HOW TO FIX REFERENCE
1. SKIPPING 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.22
BAR HEIGHT ADJUSTMENT
“NEEDLE BAR HEIGHT”.
8. INAPPROPRIATE NEEDLE SEE MECHANICAL P.23
TO HOOK TIMING ADJUSTMENT
“NEEDLE TO HOOK TIMING”.
9. INAPPROPRIATE NEEDLE SEE MECHANICAL P.24
TO HOOK CLEARANCE ADJUSTMENT “NEEDLE
CLEARANCE TO HOOK.”
2. FABRIC NOT 1. PRESSER FOOT PRESSURE ADJUST THE PRESSER BAR
MOVING IS TOO WEAK. LEVEL TO MAKE THE
PRESSURE STRONGER.
2. INCORRECT F.D. HEIGHT SEE MECHANICAL P.21
ADJUSTMENT “FEED DOG
HEIGHT.”
3. F.D. IS IN DOWN POSITION. RAISE THE F.D. LEVEL.
4. THREAD ON BOTTOM SIDE MAKE SURE TO BRING
OF FABRIC IS JAMMED UP. BOTH NEEDLE AND BOBBIN
THREAD UNDER THE FOOT
WHEN STARTING SEWING.
5. FEED DOG TEETH ARE CHANGE THE FEED DOG.
WORN.

3
MS5027PR
CONDITION CAUSE HOW TO FIX REFERENCE
3. BREAKING 1. INITIAL SEWING SPEED IS START WITH MEDIUM SPEED.
UPPER TOO FAST.
2. THREAD PATH IS USE THE PROPER THREAD
INCORRECT. PATH.
3. NEEDLE IS BENT OR DULL. REPLACE WITH A NEW NEEDLE.
4. UPPER THREAD TENSION IS ADJUST UPPER THREAD
TOO STRONG. TENSION CORRECTLY.
5. NEEDLE SIZE IS USE APPROPRIATE NEEDLE
INAPPROPRIATE FOR FOR FABRIC AND THREAD
FABRIC. 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. BREAKING 1. INCORRECTLY THREADED THREAD BOBBIN CORRECTLY.
BOBBIN BOBBIN.
2. TOO MUCH THREAD IS ADJUST THE POSITION OF
ON THE BOBBIN. STOPPER.
3. LINT IS STUCK INSIDE THE CLEAN THE HOOK.
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.28, 29
BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE
POSITION.”
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. NEEDLE IS HITTING THE SEE MECHANICAL P.24
HOOK. ADJUSTMENT “NEEDLE
CLEARANCE TO HOOK.”
4. THE FABRIC MOVES WHILE SEE MECHANICAL P.14
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.
THREAD
THREAD

4
MS5027PR
CONDITION CAUSE HOW TO FIX REFERENCE
6. NOISY 1. BACKLASH BETWEEN SEE MECHANICAL P.25
OPERATION HOOK GEAR AND LOWER ADJUSTMENT “BACKLASH
SHAFT GEAR IS TOO (LOWER SHAFT GEAR).”
GREAT.
2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS.
LOOSE.
3. INAPPROPRIATE BELT SEE MECHANICAL P.36
TENSION. ADJUSTMENT “MOTOR
BELT TENSION.”
4. NOT ENOUGH OIL OIL ALL MOVING PARTS.
5. UPPER SHAFT IS LOOSE. ELIMINATE THE LOOSENESS.
7. DEFORMATION 1. INAPPROPRIATE FEED SEE MECHANICAL P.19, 20
PATTERN BALANCE. ADJUSTMENT “STRETCH
STITCH BALANCE.”
2. INAPPROPRIATE ZIGZAG SEE MECHANICAL P.14
SYNCHRONIZATION. ADJUSTMENT “NEEDLE
SWING.”
3. UPPER THREAD TENSION SEE MECHANICAL
IS TOO STRONG. ADJUSTMENT “TOP TENSION.”
8. IMPROPER 1. BUTTONHOLE STITCH SEE MECHANICAL P.26, 27
BUTTONHOLE BALANCE IS NOT CORRECT. ADJUSTMENT “BUTTONHOLE
RESULTS STITCH BALANCE.”
2. IMPROPER SIZE ON AUTO SEE MECHANICAL P.33
BUTTONHOLE ADJUSTMENT “BUTTONHOLE
FUNCTION (1).”
3. CHANGING TO BAR TACK SEE MECHANICAL P.34
IS TOO EARLY OR WILL NOT ADJUSTMENT “BUTTONHOLE
WORK. FUNCTION (2).”

5
MS5027PR
THREADING OF MACHINE
THE NUMBERED STEPS BELOW FOLLOW THE NUMBERS ON THE ILLUSTRATIONS.
DOTTED LINES SHOW THE PLACES WHERE THE THREAD LOOPS AND IS THEN PULLED TIGHT.
RAISE THE TAKE-UP LEVER TO ITS HIGHEST POSITION BY TURNING THE HANDWHEEL TOWARD
YOU.
RAISE THE PRESSER FOOT LEVER.
PLACE THE SPOOL ON A PIN WITH THE THREAD COMING FROM THE BACK OF THE SPOOL.
1. DRAW THE THREAD THROUGH THE THREAD GUIDE.
2. HOLDING THE THREAD TAUT WITH YOUR RIGHT HAND, DRAW THE THREAD DOWN INTO THE
TENSION AREA AND THEN AROUND THE CHECK SPRING HOLDER.
3. FIRMLY DRAW THE THREAD UP AND THROUGH THE TAKE-UP LEVER FROM RIGHT TO LEFT.
4. PULL THE THREAD TO THE LEFT, AND SLIP IT INTO THE NEEDLE BAR THREAD GUIDE.
5. THREAD THE NEEDLE FROM FRONT TO BACK.
NOTE: YOU MAY WANT TO CUT THE END OF THE THREAD WITH SHARP SCISSORS FOR EASIER
NEEDLE THREADING.
1
2
3
4
5

6
MS5027PR
1
2
3
4
AUTOMATIC NEEDLE THREADER
LOWER THE PRESSER FOOT. DEPRESS THE
NEEDLE THREADER KNOB AS FAR AS IT WILL GO.
THE HOOK COMES OUT THROUGH THE NEEDLE
EYE FROM BEHIND.
NEEDLE THREADER KNOB
HOOK
DRAW THETHREAD DOWN AROUND THE
THREADER GUIDE AND UNDER THE HOOK.
THREADER GUIDE
HOOK
RELEASE THE THREADER KNOB SLOWLY WHILE
HOLDING THE THREAD END WITHYOUR HAND.
A LOOP OF THE THREAD IS PULLED UP THROUGH
THE NEEDLE EYE.
REMOVE THE LOOP FROM THE THREADER AND
PULL OUT THE THREAD END FROM THE NEEDLE
EYE.
NOTE:
THE AUTOMATIC THREADER WORKS WELL WITH
THE THREADS #50-100 AND NEEDLES #11-16, THE
BLUE TIPPED NEEDLE AS WELL.
1
2
3
4
1
2
3
4
1
2
34

7
MS5027PR
SERVICE ACCESS
FACE COVER
(TO REMOVE)
1. OPEN THE FACE COVER (A).
2. REMOVE THE SETSCREWS (B) AND TAKE THE FACE COVER (A) OFF.
(TO ATTACH)
3. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
TOP COVER
(TO REMOVE)
1. OPEN THE FACE COVER (A).
2. REMOVE THE SETSCREWS (B) AND (C).
3. TAKE THE TOP COVER (D) OFF.
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(A)
(B)
(A) (B)
(C) (D)

8
MS5027PR
SERVICE ACCESS
BASE PLATE
(TO REMOVE)
1. REMOVE THE FOUR SETSCREWS (A) AND REMOVE THE BASE PLATE (B).
(TO ATTACH)
2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
BED COVER
(TO REMOVE)
1. REMOVE THE TWO SETSCREWS (D) AND REMOVE THE BED COVER (E).
* WHEN YOU REPLACE THE BED COVER, SET THE FEED DROP LEVER (F) IN
THE LEFT POSITION.
(TO ATTACH)
2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(A)
(A)
(A)
(A) (B)
(D)
(E)
(F)

9
MS5027PR
SERVICE ACCESS
BELT COVER
PULL OUT THE STITCH SELECTOR. LOOSEN THE SETSCREW (A) AND REMOVE THE SETSCREW
(B). PULL THE RIGHT SIDE OF BELT COVER IN THE DIRECTION OF THE ARROW, AS
ILLUSTRATED AND TAKE THE LATCH OFF, AND THEN REMOVE THE BELT COVER.
* WHEN YOU REATTACH THE BELT COVER, SET THE PROJECTION INTO THE GROOVE ON THE
FRONT COVER.
FREE ARM COVER
(TO REMOVE)
1. REMOVE THE SETSCREW (A) AND THE NEEDLE PLATE.
2. REMOVE THE BED COVER (SEE PAGE 8).
3. REMOVE THE SCREW (B) AND THE FREE ARM COVER.
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
BELT COVER
PROJECTION
(B)
(A)
LATCH
(A) (B)
NEEDLE PLATE
FREE ARM COVER
STITCH SELECTOR

10
MS5027PR
SERVICE ACCESS
FRONT COVER
(TO REMOVE)
1. OPEN THE FACE COVER .
2. REMOVE THE TOP COVER (SEE PAGE 7), AND THE BELT COVER (SEE PAGE 9).
3. REMOVE THE SETSCREWS (A) AND (B).
4. LOOSEN SETSCREWS (C) AND (D), THEN REMOVE THE FRONT COVER (E).
5. PULL THE FRONT COVER OFF THE LATCH (F) OF THE REAR COVER.
6. REMOVE THE LOWER PART OF THE THREAD GUIDE (G).
(TO ATTACH)
7. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(A)
(B)
(C)
(D)
(E)
(F)
(G)
(C)
(B)
(D)
(A)

11
MS5027PR
SERVICE ACCESS
REAR PANEL
(TO REMOVE)
1. OPEN THE FACE COVER.
2. REMOVE THE TOP COVER UNIT (SEE PAGE 7), THE BELT COVER (SEE PAGE 9) AND THE FRONT
COVER (SEE PAGE 10).
3. REMOVE THE SETSCREWS (A), (B), AND (C), AND LOOSEN THE SETSCREWS (D), (E) AND (F).
4. LOWER THE PRESSER FOOT LEVER, AND PULL AWAY THE REAR PANEL UNIT FROM THE
MACHINE FRAME. TWIST AND REMOVE THE ARM COVER PART FROM THE PRESSER FOOT
LEVER.
(TO ATTACH)
5. WHEN YOU REATTACH THE REAR PANEL, PUT THE “WINDOW” ON THE PLASTIC PANEL OVER
THE PRESSER FOOT LEVER, AND THEN REPLACE THE SIX SCREWS.
(A)
(B)
(C)
(D)
(E)
(F)
TWIST AND REMOVE THE ARM COVER
PART FROM THE PRESSER FOOT LEVER.
PRESSER FOOT LEVER
REAR PANEL UNIT

12
MS5027PR
MECHANICAL ADJUSTMENT
TOP TENSION
TO CHECK:
1. SET THE TENSION DIAL AT "4", AND RAISE THE PRESSER FOOT.
2. PASS THE THREAD (A) BETWEEN THE DISCS, AND DRAW THE THREAD (A) DOWN AROUND THE
CHECK SPRING HOLDER AS IN FIG. 1.
3. LOWER THE PRESSER FOOT, AND BRING THE THREAD (A) UP.
4. THE TOP TENSION SHOULD BE BETWEEN 75 AND 90g WHEN PULLING THE THREAD (A) UP IN
THE DIRECTION OF (B).
* USE POLYESTER SEWING THREAD #50 (WHITE).
* IF IT IS NOT WITHIN THE ABOVE LIMITS, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:
1. REMOVE THE FRONT COVER UNIT (SEE PAGE 10).
2. PULL THE SPRING (C) AWAY FROM THE LEAD SCREW (D).
3. IF THE TOP TENSION IS TOO LOOSE, TURN THE LEAD SCREW (D) IN THE DIRECTION OF (E).
IF THE TOP TENSION IS TOO TIGHT, TURN THE LEAD SCREW (D) IN THE DIRECTION OF (F).
(C)
(D)
TOP TENSION CONTROL
SET AT "4"
(E)
(F)
(C)
TO TIGHTEN
TO LOOSEN
DETACH
(D)
PULL THIS WAY
(B)
(A)
FIG.1

13
MS5027PR
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT AND ALIGNMENT
TO CHECK:
1. RAISE THE PRESSER FOOT LEVER (B).
2. THE DISTANCE BETWEEN THE ZIGZAG FOOT (A) AND THE NEEDLE PLATE (C) SHOULD BE 6.0 MM
(0.24").
* IF THIS IS NOT THE CASE, ADJUST AS FOLLOWS.
ADJUSTMENT PROCEDURE:
1. OPEN THE FACE COVER.
2. RAISE THE PRESSER FOOT LEVER (B), AND LOOSEN THE HEXAGONAL SOCKET SCREW (D) ON
THE PRESSER BAR HOLDER (E).
3. ADJUST THE DISTANCE BETWEEN THE ZIGZAG FOOT (A) AND THE NEEDLE PLATE (C) TO 6.0 MM
(0.24").
4. TIGHTEN THE SETSCREW (D) SECURELY.
NOTE: WHEN YOU TIGHTEN THE SETSCREW (D), MAKE SURE THAT BOTH SIDES OF THE
ZIGZAG FOOT (A) ARE PARALLEL WITH THE FEED DOG SLITS.
(A)
(C)
(B)
(D)
(E)
(F) FEED DOG SLITS
SHOULD BE PARALLEL
6 MM

14
MS5027PR
MECHANICAL ADJUSTMENT
NEEDLE SWING
TO CHECK:
IF THE NEEDLE BAR MOVES SIDEWAYS WHILE THE NEEDLE IS IN THE FABRIC IN ZIGZAG
STITCHING, ADJUST IT AS FOLLOWS:
(THE NEEDLE SHOULD START SWINGING 2 (0.08") TO 3 MM (0.12") ABOVE THE NEEDLE PLATE.)
ADJUSTMENT PROCEDURE:
1. REMOVE THE TOP COVER (SEE PAGE 7), SET THE PATTERN SELECTOR DIAL AT " ", AND
SELECT THE MAXIMUM ZIGZAG WIDTH.
2. LOOSEN THE TWO HEXAGONAL SOCKET SCREWS ON THE UPPER SHAFT WORM.
3. WHILE HOLDING THE UPPER SHAFT WORM IN PLACE, CAREFULLY TURN THE HANDWHEEL AND
ADJUST IT SO THAT THE LATERAL NEEDLE SWING STARTS FROM A POSITION 2 MM (0.08") TO 3
MM (0.12") ABOVE THE NEEDLE PLATE IN RIGHT OUTFLOW.
4. TIGHTEN THE TWO HEXAGONAL SOCKET SCREWS ON THE UPPER SHAFT WORM.
5. ATTACH THE TOP COVER (UNIT).
NOTE: FOR REMOVAL AND REPLACEMENT OF THE TOP COVER (UNIT), REFER TO PAGE 2.
AFTER THE TIMING ADJUSTMENT OF THE LATERAL NEEDLE SWING, MAKE SURE THAT
THERE IS NO BACKLASH BETWEEN THE UPPER SHAFT WORM AND THE OTHER GEAR,
AND THAT A SMOOTH ROTATION IS OBTAINED.
UPPER SHAFT
WORM
HEXAGONAL
SOCKET SCREW
GEAR
THE BACKLASH
IS DECREASED. THE BACKLASH
IS INCREASED.
(NOTE)
MAKE SURE THE WORM DOES
NOT MOVE SIDEWAYS WHEN
TURNING THE UPPER SHAFT.
OTHERWISE, THE BACKLASH
BETWEEN THE WORM AND THE
GEAR WILL CHANGE.
2-3 MM
(RIGHT OUTFLOW START POSITION)

15
MS5027PR
MECHANICAL ADJUSTMENT
STRAIGHT STITCHING
TO CHECK:
1. SET THE STITCH WIDTH CONTROL AT "0", AND THE STITCH SELECTOR AT " ".
2. TURN THE HANDWHEEL BY HAND.
3. THE NEEDLE SHOULD NOT SWING SIDE TO THE SIDE AT THIS SETTING.
SELECTED PATTERN STITCH WIDTH CONTROL

16
MS5027PR
MECHANICAL ADJUSTMENT
STRAIGHT STITCHING
ADJUSTMENT PROCEDURE:
1. REMOVE THE TOP COVER (SEE PAGE 7).
2. LOOSEN SETSCREW (A).
3. MOVE THE ZIGZAG WIDTH ROD (B) UNTIL THE NEEDLE CEASES ITS ZIGZAG MOVEMENT WHEN
YOU TURN THE HANDWHEEL TOWARD YOU.
4. RETIGHTEN SETSCREW (A) SECURELY.
(B)
(A)

17
MS5027PR
MECHANICAL ADJUSTMENT
DISTRIBUTION OF NEEDLE SWING
TO CHECK:
1. SET THE STITCH WIDTH CONTROL TO "0" AND THE STITCH SELECTOR AT " ".
2. RAISE THE NEEDLE TO ITS HIGHEST POSITION.
3. DROP THE FEED DOGS.
4. PLACE A PIECE OF PAPER ON THE NEEDLE PLATE, AND LOWER THE PRESSER FOOT.
5. LOWER THE NEEDLE TO MARK THE NEEDLE POINT (A) ON A PIECE OF PAPER BY TURNING THE
HANDWHEEL.
6. RAISE THE NEEDLE TO ITS HIGHEST POSITION.
7. SLIDE THE STITCH WIDTH CONTROL TO "6.5".
8. LOWER THE NEEDLE TO MARK THE NEEDLE POINTS (B AND C) ON THE PIECE OF PAPER, BY
TURNING THE HANDWHEEL.
9. THE DISTANCE BETWEEN A-B AND A-C SHOULD BE EQUAL.
SELECTED PATTERN STITCH WIDTH CONTROL
A
BC

18
MS5027PR
MECHANICAL ADJUSTMENT
DISTRIBUTION OF NEEDLE SWING
ADJUSTMENT PROCEDURE:
1. OPEN THE FACE COVER, AND LOOSEN THE HEXAGONAL SOCKET SCREW (D).
2. MOVE THE NEEDLE BAR SUPPORTER (E) IN EITHER DIRECTION UNTIL THE DISTANCES A TO B,
AND A TO C, BECOME EQUAL.
3. TIGHTEN HEXAGONAL SOCKET SCREW (D) SECURELY.
A
BC
(D)
(E)