Janome 415 User manual

SERVICING MANUAL
419S/423S
415

1
TROUBLESHOOTING
PROBLEM CAUSE REMEDY REFERENCE
1. SKIPPING 1. NEEDLEISNOTINSERTED INSERTTHENEEDLEPROPERLY.
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. INAPPROPRIATE NEEDLE SEE MECHANICAL P. 15
BAR HEIGHT ADJUSTMENT
“NEEDLE BAR HEIGHT.”
7. INAPPROPRIATE NEEDLE SEE MECHANICAL P. 16
TO HOOK TIMING ADJUSTMENT “NEEDLE
TIMING TO SHUTTLE.”
8. INAPPROPRIATE NEEDLE SEE MECHANICAL P. 12, 13
TO HOOK CLEARANCE ADJUSTMENT “CLEARANCE
BETWEEN NEEDLE AND
HOOK.”
2. FABRIC NOT 1. INCORRECT FEED DOG SEE MECHANICAL P. 14
MOVING HEIGHT ADJUSTMENT “FEED DOG
HEIGHT.”
2. THREAD ON BOTTOM SIDE MAKE SURE TO BRING
OF FABRIC IS JAMMED UP. BOTH NEEDLE AND BOBBIN
THREAD UNDER THE FOOT
WHEN STARTING SEWING.
3. FEED DOG TEETH ARE CHANGE THE FEED DOG.
WORN.

2
PROBLEM CAUSE REMEDY 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 P. 7
TOO STRONG. TENSION CORRECTLY.
5. NEEDLE SIZE IS USE APPROPRIATE NEEDLE
INAPPROPRIATE FOR AND THREAD FOR FABRIC
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 CASE
BOBBIN BOBBIN CASE. CORRECTLY.
2. TOO MUCH THREAD IS ADJUST THE POSITION OF
WOUND ON THE BOBBIN. STOPPER.
3. LINT IS STUCK INSIDE THE CLEAN THE HOOK RACE.
HOOK RACE.
4. THREAD QUALITY IS CHANGE TO A HIGH QUALITY
TOO LOW. SEWING THREAD.
5. THREAD IS JAMMING CLEAR OUT THE JAMMING
AROUND THE BOBBIN. THREAD.
6. BOBBIN THREAD TENSION IS ADJUST BOBBIN THREAD P. 8
TOO STRONG. TENSION CORRECTLY.
5. NEEDLE 1. NEEDLE IS HITTING THE SEE MECHANICAL P. 11
BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE DROP.”
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. NEEDLE IS HITTING THE SEE MECHANICAL P. 12, 13
HOOK RACE. ADJUSTMENT “CLEARANCE
BETWEEN NEEDLE AND HOOK.”
4. THE FABRIC MOVES WHILE SEE MECHANICAL P. 10
THE NEEDLE IS PIERCING ADJUSTMENT “NEEDLE SWING.”
IT, OR THE NEEDLE ZIGZAGS
WHILE IN FABRIC.
5. FABRIC IS BEING PULLED TOO GUIDE THE FABRIC GENTLY
STRONGLY WHILE SEWING. WHILE SEWING.
THREAD
THREAD

3
PROBLEM CAUSE REMEDY REFERENCE
6. NOISY 1. BACKLASH BETWEEN SEE MECHANICAL P. 13
OPERATION SHUTTLE HOOK GEAR AND ADJUSTMENT “CLEARANCE
LOWER SHAFT GEAR IS TOO BETWEEN NEEDLE AND HOOK
GREAT. (NO. 2).”
2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS.
LOOSE.
3. INAPPROPRIATE BELT SEE MECHANICAL P. 24
TENSION. ADJUSTMENT “MOTOR BELT
TENSION.”
4. UPPERSHAFT WORMISLOOSE. ELIMINATE THE LOOSENESS.
5. NOT ENOUGH OIL. OIL ALL MOVING PARTS.
7. DEFORMATION 1. INAPPROPRIATE ZIGZAG SEE MECHANICAL P. 10
OF PATTERN SYNCHRONIZATION. ADJUSTMENT “NEEDLE
SWING.”
2. INAPPROPRIATE SEE MECHANICAL P. 20
DISENGAGEMENT OF CAM ADJUSTMENT
FOLLOWER. “DISENGAGEMENT OF CAM
FOLLOWER.”
3. UPPER THREAD TENSION ADJUST UPPER THREAD P. 7
IS TOO STRONG. TENSION CORRECTLY.
4. INAPPROPRIATE FEED SEE MECHANICAL P. 18
BALANCE ADJUSTMENT "FEED BALANCE
ON STRETCH STITCH."

CONTENTS
TROUBLESHOOTING........................................................................................... 1–3
SERVICE ACCESS
FACE COVER / TOP COVER .............................................................. 4
BELT COVER ....................................................................................... 5
BASE .................................................................................................... 5
FRONT COVER.................................................................................... 6
MECHANICAL ADJUSTMENT
TOP TENSION ..................................................................................... 7
BOBBIN TENSION ............................................................................... 8
PRESSER BAR HEIGHT AND ALIGNMENT ....................................... 9
NEEDLE SWING .................................................................................. 10
NEEDLE DROP .................................................................................... 11
CLEARANCE BETWEEN NEEDLE AND HOOK (NO. 1)..................... 12
CLEARANCE BETWEEN NEEDLE AND HOOK (NO. 2)..................... 13
FEED DOG HEIGHT ............................................................................ 14
NEEDLE BAR HEIGHT ........................................................................ 15
NEEDLE TIMING TO SHUTTLE .......................................................... 16
BUTTONHOLE FEED BALANCE......................................................... 17
FEED BALANCE ON STRETCH STITCH ............................................ 18
BARTACK FEED OF BUTTONHOLE................................................... 19
DISENGAGEMENT OF CAM FOLLOWER .......................................... 20
NEEDLE SWING IN STRAIGHT STITCH SEWING............................. 21
BUTTONHOLE LENGTH...................................................................... 22
MOTOR BELT TENSION ..................................................................... 23
WIRING .............................................................................................................. 24

4
SERVICE ACCESS
FACE COVER
(TO REMOVE)
1. REMOVE THE FACE COVER BY REMOVING THE CAP (A) AND SCREW (B).
(TO ATTACH)
2. ATTACH THE FACE COVER WITH THE SCREW, AND THEN, REPLACE THE CAP.
FACE COVER
(B)
(A)
TOP COVER
(TO REMOVE)
1. REMOVE THE FACE COVER.
2. LOOSEN THE SETSCREW (C) AND REME SETSCREWS (D).
3. REMOVE THE TOP COVER.
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(C)
(D)
TOP COVER

5
BASE
(TO REMOVE)
1. REMOVE THE FACE COVER, TOP COVER (SEE PAGE 4) AND BELT COVER.
2. REMOVE 6 SCREWS (B).
3. REMOVE THE BASE.
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
BELT COVER
1. REMOVE THE FACE COVER AND TOP COVER (SEE PAGE 4).
2. LOOSEN SCREW (A).
3. TAKE THE BELT COVER OUT.
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
(A)
BELT COVER
BASE
(B)
SERVICE ACCESS
(B)
(B)

6
SERVICE ACCESS
FRONT COVER
(TO REMOVE)
1. REMOVE THE FACE COVER, TOP COVER, BELT COVER AND BASE (SEE PAGES 4-5).
2. REMOVE THE PATTERN SELECTOR DIAL.
3. LOOSEN SETSCREWS (A) AND (B), AND THEN, REMOVE THE FRONT COVER BY
REMOVING SETSCREWS (C) AND (D).
(TO ATTACH)
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
FRONT COVER
(A)
(B)
(C)
(D)
PATTERN SELECTOR DIAL

7
MECHANICAL ADJUSTMENT
TOP TENSION
TO CHECK:
THE STANDARD UPPER THREAD TENSION SHOULD BE 65–95 g WHEN PULLING THE
THREAD (COTTON THREAD #50) IN THE DIRECTION OF (A) WITH THE TENSION DIAL AT
“3.” (MAKE SURE THE FOOT IS LOWERED.)
IF THE TENSION IS OUT OF THE STANDARD RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. REMOVE THE TOP COVER (SEE PAGE 4).
2. TURN THE ADJUSTING NUT (B) IN THE DIRECTION OF (C) WHEN THE UPPER THREAD
TENSION IS TOO TIGHT.
TURN THE ADJUSTING NUT (B) IN THE DIRECTION OF (D) WHEN THE UPPER THREAD
TENSION IS TOO LOOSE.
3. ATTACH THE TOP COVER.
(A) (B)
(C)
(D)

8
MECHANICAL ADJUSTMENT
BOBBIN TENSION
TO CHECK:
SET THE BOBBIN IN THE BOBBIN CASE AND PASS THE THREAD (COTTON #50) THROUGH
THE TENSION SPRING.
THE BOBBIN THREAD TENSION SHOULD BE 45–55g WHEN PULLING THE THREAD IN THE
DIRECTION OF (A).
IF THE TENSION IS OUT OF THIS RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. IF THE BOBBIN THREAD TENSION IS TOO TIGHT, TURN THE ADJUSTING SCREW (B)
IN THE DIRECTION OF (C).
2. IF THE BOBBIN THREAD TENSION IS TOO LOOSE, TURN THE ADJUSTING SCREW (B)
IN THE DIRECTION OF (D)
(A)
(B)
(C)
(D)
COTTON THREAD #50