Janome 4052lx Service Manual
SERVICE MANUAL
4052LX
TABLE OF CONTENTS
LOCATE AND IDENTIFY THE PARTS ....................................................................................1
WHAT TO DO WHEN .......................................................................................................2 - 4
THREADING OF MACHINE...................................................................................................5
SERVICE ACCESS
FACE COVER ........................................................................................................................6
FREE ARM LEGS COVER.....................................................................................................6
FRONT COVER......................................................................................................................7
REAR PANEL .........................................................................................................................8
MECHANICAL ADJUSTMENT
TOP TENSION .......................................................................................................................9
PRESSER BAR HEIGHT AND ALLIGNMENT .....................................................................10
NEEDLE SWING ..................................................................................................................11
STRAIGHT STITCHING (1) .................................................................................................12
NEEDLE DROP (2) ..............................................................................................................13
STRETCH STITCH BALANCE ............................................................................................14
FEED DOG HEIGHT ............................................................................................................15
NEEDLE BAR HEIGHT ........................................................................................................16
NEEDLE TO SHUTTLE TIMING ..........................................................................................17
NEEDLE CLEARANCE TO SHUTTLE ................................................................................18
BACKLASH (BETWEEN LOWER SHAFT GEAR AND SHUTTLE HOOK GEAR) ..............19
NEEDLE POISITION MISALIGNMENT ...............................................................................20
ZERO FEEDING .................................................................................................................21
BUTTONHOLE STITCH BALANCE .....................................................................................22
ZERO FEEDING OF BUTTONHOLE BARTACK .................................................................23
BUTTONHOLE FUNCTION .................................................................................................24
REPLACEMENT AND ADJUSTMENT OF NEEDLE THREADER PLATE ..........................25
MOTOR BELT TENSION .....................................................................................................26
WIRING OF TERMINAL BLOCK .........................................................................................27
OILING .................................................................................................................................28
1
LOCATE AND IDENTIFY THE PARTS
Pattern indicating window
Stitch length dial
Stitch width dial
Spool holder (Large)
Spool pin
Thread tension dial
Bobbin winder thread guide
Thread take-up lever
Pressure adjusting
dial
Face cover
Thread cutter
Needle threader
Needle plate
Hook cover
Extension table
(Accessory box)
Hook cover plate release
button
Reverse stitch button
Drop feed lever
Carrying handle
Bobbin winder spindle
Bobbin winder stopper
Handwheel
Pattern selector dial
Feed balancing dial
Power switch
Machine socket
Free arm
Buttonhole lever
Presser foot lifter
Additional spool pin hole
2
WHA T T O 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.16
BAR HEIGHT ADJUSTMENT
“NEEDLE BAR HEIGHT”.
8. INAPPROPRIATE NEEDLE SEE MECHANICAL P.17
TO SHUTTLE TIMING ADJUSTMENT
“NEEDLE TO SHUTTLE TIMING”.
9. INAPPROPRIATE NEEDLE SEE MECHANICAL P.18
TO SHUTTLE CLEARANCE ADJUSTMENT “NEEDLE
CLEARANCE TO SHUTTLE.”
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.15
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
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 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.20
BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE
POSITION.”
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. NEEDLE IS HITTING THE SEE MECHANICAL P.18
SHUTTLE. ADJUSTMENT “NEEDLE
CLEARANCE TO SHUTTLE.”
4. THE FABRIC MOVES WHILE SEE MECHANICAL P.11
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
6. NOISY 1. BACKLASH BETWEEN SEE MECHANICAL P.19
OPERATION SHUTTLE HOOK GEAR AND ADJUSTMENT “BACKLASH
LOWER SHAFT GEAR IS TOO (LOWER SHAFT GEAR).”
GREAT.
2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS.
LOOSE.
3. INAPPROPRIATE BELT SEE MECHANICAL P.26
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.14
PATTERN BALANCE. ADJUSTMENT “STRETCH
STITCH BALANCE.”
2. INAPPROPRIATE ZIGZAG SEE MECHANICAL P.11
SYNCHRONIZATION. ADJUSTMENT “NEEDLE
SWING.”
3. UPPER THREAD TENSION SEE MECHANICAL P. 9
IS TOO STRONG. ADJUSTMENT “TOP TENSION.”
8. IMPROPER 1. BUTTONHOLE STITCH SEE MECHANICAL P.22
BALANCE IS NOT CORRECT. ADJUSTMENT “BUTTONHOLE
STITCH BALANCE.”
2. CHANGING TO BAR TACK SEE MECHANICAL P.24
IS TOO EARLY OR WILL NOT ADJUSTMENT “BUTTONHOLE
WORK. FUNCTION .”
CONDITION CAUSE HOW TO FIX REFERENCE
BUTTONHOLE
RESULTS
5
THREADING OF MACHINE
THE STEP NUMBE CORRESPONDS WITH THE NUMBER IN 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 Y OU.
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
SERVICE ACESS (1)
TO REMOVE:
REMOVE THE SETSCREW (B) TO TAKE OUT THE FACE COVER (A).
TO ATTACH:
TO REPLACE, FOLLOW THE ABOVE PROCEDURE IN REVERSE.
FREE ARM LEGS COVER
TO REMOVE:
1. REMOVE THE SETSCREW (C).
2. REMOVE THE FREE ARM LEGS COVER (D).
TO ATTACH:
TO REPLACE, FOLLOW THE ABOVE PROCEDURE IN REVERSE.
SETSCREW (C)
FREE ARM LEGS COVER (D)
FACE COVER
FACE COVER (A)
SETSCREW (B)
7
TO REMOVE:
1. REMOVE THE FACE COVER AND FREE ARM LEGS COVER (SEE PAGE 6.)
2. REMOVE THE PATTERN SELECTOR DIAL (K), AND SETSCREWS (A) - (G)
3. LOOSEN SETSCREW (H).
4. DISENGAGE THE FRONT COVER HOOK (I), (J) AND THEN REMOVE THE FRONT COVER.
TO ATTACH:
TO REPLACE, FOLLOW THIS PROCEDURE IN REVERSE.
PATTERN SELECTOR
DIAL (K)
(A)
(B)
(C)
(D)
(E)
(F)
(G)
(H)
(I)
(J)
SERVICE ACCESS (2)
FRONT COVER
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