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SERVICE MANUAL
&
MODEL: NH15
PARTS LIST
Page 2
2
CONTENTS
WHAT TO DO WHEN
...................................................................................... 3-5
SERVICE ACCESS
FACE COVER ............................................................................................... 6
TOP COVER ................................................................................................. 6
BASE COVER ............................................................................................... 7
REAR COVER .............................................................................................. 8
FRONT COVER ............................................................................................ 9
MECHANICAL ADJUSTMENT
NEEDLE THREAD TENSION .................................................................... 10
BOBBIN TENSION ...................................................................................... 11
PRESSER BAR HEIGHT AND ALIGNMENT ............................................. 12
NEEDLE SWING ........................................................................................ 13
NEEDLE DROP POSITION ........................................................................ 14
CLEARANCE BETWEEN NEEDLE AND SHUTTLE ............................. 15-16
FEED DOG HEIGHT ................................................................................... 17
NEEDLE BAR HEIGHT ............................................................................... 18
NEEDLE TIMING TO SHUTTLE ................................................................. 19
BUTTONHOLE FEED BALANCE ............................................................... 20
DISENGAGEMENT OF CAM FOLLOWER ................................................. 21
MOTOR BELT TENSION ............................................................................. 22
WIRING ....................................................................................................... 23
PARTS LIST
............................................................................................... 24-41
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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 THE SEWING NEEDLE AND THREAD.
FABRIC BEING SEWN.
5. SEWING ON STRETCH USE A #11 BLUE TIP NEEDLE.
FABRIC
6. INAPPROPRIATE NEEDLE SEE MECHANICAL P.18
BAR HEIGHT ADJUSTMENT
“NEEDLE BAR HEIGHT.”
7. INAPPROPRIATE NEEDLE SEE MECHANICAL P.19
TO HOOK TIMING ADJUSTMENT “NEEDLE
TIMING TO SHUTTLE.”
8. INAPPROPRIATE NEEDLE SEE MECHANICAL P.15,16
TO SHUTTLE CLEARANCE ADJUSTMENT “CLEARANCE
BETWEEN NEEDLE AND
SHUTTLE.”
2. FABRIC NOT 1. INCORRECT SEE MECHANICAL P.17
MOVING FEED DOG HEIGHT ADJUSTMENT “FEED DOG
HEIGHT.”
2. THREAD ON BOTTOM SIDE MAKE SURE TO BRING
OF FABRIC IS JAMMED UP. BOTH NEEDLE AND BOBBIN
THREADS UNDER THE FOOT
WHEN START SEWING.
3. FEED DOG TEETH ARE CHANGE THE FEED DOG.
WORN.
WHAT TO DO WHEN
Page 4
4
CONDITION CAUSE HOW TO FIX REFERENCE
3. BREAKING 1. INITIAL SEWING SPEED IS START WITH MEDIUM SPEED.
UPPER TOO FAST.
THREAD 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.10
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.
THREAD 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.11
TOO STRONG. TENSION CORRECTLY.
5. NEEDLE 1. NEEDLE IS HITTING THE SEE MECHANICAL P.14
BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE DROP.”
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. NEEDLE IS HITTING THE SEE MECHANICAL P.15, 16
SHUTTLE RACE. ADJUSTMENT “CLEARANCE
BETWEEN NEEDLE AND SHUTTLE”.
4. THE FABRIC MOVES WHILE SEE MECHANICAL P.13
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.
WHAT TO DO WHEN
Page 5
5
CONDITION CAUSE HOW TO FIX REFERENCE
6. NOISY 1. BACKLASH BETWEEN SEE MECHANICAL P.16
OPERATION SHUTTLE HOOK GEAR AND ADJUSTMENT “CLEARANCE
LOWER SHAFT GEAR IS TOO BETWEEN NEEDLE AND
GREAT. SHUTTLE (NO.2)”.
2. LOWER SHAFT GEAR IS ELIMINATE THE LOOSENESS.
LOOSE.
3. INAPPROPRIATE BELT SEE MECHANICAL P.24
TENSION. ADJUSTMENT “MOTOR BELT
TENSION”.
4. UPPER SHAFT GEAR IS LOOSE. ELIMIN ATE THE LOOSENESS.
5. NOT ENOUGH OIL. OIL ALL MOVING PARTS.
7. DEFORMATION 1. INAPPROPRIATE ZIGZAG SEE MECHANICAL P.13
PATTERN SYNCHRONIZATION. ADJUSTMENT “NEEDLE
SWING”.
2. INAPPROPRIATE SEE MECHANICAL P.23
DISENGAGEMENT OF CAM ADJUSTMENT
FOLLOWER. “DISENGAGEMENT OF CAM
FOLLOWER".
3. UPPER THREAD TENSION ADJUST UPPER THREAD P.10
IS TOO STRONG. TENSION CORRECTLY.
WHAT TO DO WHEN
Page 6
6
FACE COVER
SETSCREW(B)
CAP(A)
SETSCREW(C)
THREAD GUIDE
SERVICE ACCESS
FACE COVER
TO REMOVE:
1. REMOVE THE FACE COVER BY REMOVING THE CAP (A) AND SETSCREW (B).
TO ATTACH:
2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
TOP COVER
TO REMOVE
:
1. REMOVE THE SETSCREWS (C).
2. SLIDE THE CORNER OF THE TOP COVER SLIGHTLY IN THE DIRECTION OF ARROW.
BE CAREFUL THAT THE THREAD GUIDE SHOULD NOT INTERFERE WITH THE TOP
COVER WHEN REMOVING.
3. TAKE THE TOP COVER OUT.
TO ATTACH
:
4. FOLLOW THE ABOVE PROCEDURE IN REVERSE.
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7
(A)
BASE COVER
SERVICE ACCESS
BASE COVER
TO REMOVE:
1. LOOSEN THE SETSCREWS (A).
2. REMOVE THE BASE PLATE.
TO ATTACH:
3. MOUNT THE BASE PLATE AND SECURE IT WITH SETSCREWS.
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8
(B)
(A)
(C)
(D)
(E)
(F)
(G)
(H)
(I)
(J)
(C)
SERVICE ACCESS
REAR COVER
TO REMOVE:
1. REMOVE THE FACE COVER AND SETSCREW (A) (SEE PAGE 4).
2. OPEN THE SHUTTLE COVER AND REMOVE THE SETSCREWS (B), (C) AND (D).
3. REMOVE THE CAPS AND SETSCREWS (E), (F), (G),
4. REMOVE THE SETSCREWS (H) AND (I).
5. OPEN THE TOP COVER (SEE PAGE 5). LOOSEN THE SETSCREW (J).
6. REMOVE THE REAR COVER.
TO ATTACH:
7. MOUNT THE REAR COVER IN REVERSE PROCEDURE OF THE REMOVING.
Page 9
9
(A)
(B)
(C)
(D)
(E)
(F)
(G)
(H)
SERVICE ACCESS
FRONT COVER
TO REMOVE
:
1. REMOVE THE FACE COVER AND TOP COVER (SEE PAGE 4 AND 5).
2. LOOSEN THE SETSCREW (A).
3. REMOVE THE SETSCREW (B),
REMOVE THE REAR COVER (SEE PAGE 6).
LOOSEN THE SETSCREW (C), (E) AND (H). REMOVE THE SETSCREW (D).
4. OPEN THE SHUTTLE COVER. REMOVE THE SETSCREW (F).
5. REMOVE THE BASE COVER AND THE SETSCREW (G) (SEE PAGE 5).
TO ATTACH
:
6. MOUNT THE FRONT COVER IN REVERSE PROCEDURE OF THE REMOVING.
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10
MECHANICAL ADJUSTMENT
TOP TENSION
THE TOP TENSION SHOULD BE BETWEEN 65 AND 95G WHEN PULLING THE THREAD UP IN
THE DIRECTION OF C.
* USE POLYESTER SEWING THREAD #50 (WHITE).
* IF IT IS NOT WITHIN THE ABOVE LIMIT, ADJUST AS FOLLOWS.
1. SET THE TENSION DIAL “3”.
2. REMOVE THE COVER.
3. LOWER THE PRESSER FOOT.
• IF THE TOP TENSION IS TOO LOOSE, TURN THE LEAD SCREW IN THE DIRECTION (A).
• IF THE TOP TENSION IS TOO TIGHT, TURN THE LEAD SCREW IN THE DIRECTION (B).
4. CHECK THE TOP TENSION AND ATTACH THE COVER.
WHITE POLYESTER THREAD SIZE 50
PULL THE THREAD AT THE SPEED OF 110 MM/
SEC IN THE DIRECTION OF ARROW
(A)
(B)
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11
(B)
(E)
(D)
(C)
COTTON THREAD #50
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 (B).
IF THE TENSION IS OUT OF THE RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (D) WHEN THE BOBBIN THREAD
TENSION IS TOO TIGHT.
2. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (E) WHEN THE BOBBIN THREAD
TENSION IS TOO LOOSE.
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12
(C)
(A)
(D)
(E)
(F)
6.0 MM
(B)
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 6.0 MM (0.24˝).
ADJUSTMENT PROCEDURE:
1. REMOVE THE FACE COVER (SEE PAGE 6).
2. REMOVE THE SETSCREWS (B) AND THE LAMP SOCKET, THEN LOOSEN THE SCREW (C)
ON THE PRESSER BAR HOLDER.
ADJUST THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (D)
TO 6.0 MM (0.24˝).
3. TIGHTEN THE SCREW (C) SECURELY.
4. TIGHTEN THE SETSCREW (B) TO SECURE THE LAMP SOCKET.
5. 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) IN THE NEEDLE PLATE (E).
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UPPER SHAFT WORM
GEAR
SETSCREW
(2PCS.)
2–3 MM
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 T
TOP COVER (SEE PAGE 6).
2. LOOSEN TWO SETSCREWS.
3. ADJUST THE NEEDLE SWING BY TURNING THE HANDWHEEL, WHILE HOLDING THE
WORM SO AS NOT TO ROTATE IT, UNTIL THE NEEDLE SWING STARTS 2–3 MM ABOVE
THE NEEDLE PLATE AFTER THE NEEDLE HAS COME OUT OF THE RIGHT SIDE OF THE
NEEDLE HOLE.
4. TIGHTEN TWO SETSCREWS.
5. MOUNT THE FRONT COVER.
NOTE:
AFTER ADJUSTING THE NEEDLE SWING, CHECK THAT THE UPPER SHAFT WORM AND
GEAR ROTATE SMOOTHLY WITHOUT ANY BACKLASH BETWEEN THEM.
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EccEntric pin
ScrEw
Both clEarancES Should BE Equal
MECHANICAL ADJUSTMENT
NEEDLE DROP POSITION
TO CHECk:
whEn thE nEEdlE SwingS in maximum zigzag width, thE diStancE BEtwEEn Both
EndS of thE nEEdlE holE on thE nEEdlE platE and thE nEEdlE drop poSitionS
Should BE Equal.
if not, adjuSt aS followS:
ADJUSTMENT PROCEDURE:
1. rEmovE thE facE covEr (SEE pagE 6).
2. SEt thE pattErn SElEctor dial at maximum zigzag width.
3. looSEn thE ScrEw.
4. turn thE EccEntric pin to adjuSt thE nEEdlE drop.
5. tightEn thE ScrEw.
6. attach thE facE covEr.
NOTE:
chEck thE hook timing aftEr thiS adjuStmEnt.
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MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND SHUTTLE
(ADJUSTMENT METHOD NO. 1)
TO CHECk:
thE clEarancE BEtwEEn thE nEEdlE and ShuttlE racE Should BE –0.05 to +0.10 mm.
if not, adjuSt aS followS:
ADJUSTMENT PROCEDURE:
1. rEmovE thE facE covEr (SEE pagE 6).
2. SEt thE pattErn SElEctor dial at " ".
3. looSEn ScrEw (a), and movE thE nEEdlE Bar SupportEr in thE dirEction of
thE arrowS to gEt a clEarancE BEtwEEn –0.05 to +0.10 mm.
* if clEarancE iS too widE, movE thE nEEdlE Bar SupportEr in thE
dirEction (B).
* if clEarancE iS too narrow, movE thE nEEdlE Bar SupportEr in thE
dirEction (c).
NOTE:
aftEr thiS adjuStmEnt, chEck that thE clEarancE BEtwEEn thE nEEdlE and
nEEdlE platE iS 0.15 mm or morE aS Shown in figurE (d).
if not, adjuSt thE clEarancE BEtwEEn nEEdlE and ShuttlE racE BY uSing
adjuStmEnt mEthod no. 2 (SEE pagE 16).
4. attach thE facE covEr.
ScrEw (a)
dirEction (c)
dirEction (B)
nEEdlE Bar SupportEr
–0.05 to +0.10 mm
figurE (d)
clEarancE BEtwEEn nEEdlE and
nEEdlE platE Should BE 0.15 mm or
morE.
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MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND SHUTTLE
(ADJUSTMENT METHOD NO.2)
TO CHECk:
uSE thiS adjuStmEnt mEthod no. 2 if thE clEarancE cannot BE adjuStEd
BY mEthod no.1.
thE clEarancE BEtwEEn thE nEEdlE and ShuttlE racE Should BE –0.05
to +0.10 mm.
ADJUSTMENT PROCEDURE:
1. SEt thE pattErn SElEctor dial at " ".
2. rEmovE thE rEar covEr (SEE pagE 8).
3. looSEn thE ScrEw (a) on thE lowEr Shaft BuShing and SlidE thE gEar aBout
0.5 mm to thE right to crEatE SomE BacklaSh BEtwEEn thE gEarS.
4. lowEr thE nEEdlE and looSEn thE two ShuttlE racE SEtScrEwS (B).
pull up or puSh down thE ShuttlE racE to adjuSt thE clEarancE BEtwEEn
thE nEEdlE and thE ShuttlE racE in thE rangE of – 0.05 to + 0.10 mm.
5. SEt thE pattErn SElEctor dial at " ", turn thE handwhEEl to chEck if thE
clEarancE BEtwEEn thE nEEdlE and innEr EdgES of thE ShuttlE racE Spring
at thE lEft and right nEEdlE dropS arE Equal. if not, adjuSt BY turning thE
ShuttlE racE unit.
6. tightEn thE two ShuttlE racE SEtScrEwS (B).
7. SlidE thE gEar Back to thE original poSition whilE adjuSting thE BacklaSh.
8. tightEn ScrEw (a) firmlY.
9. attach thE rEar covEr.
NOTE:
thE rotarY plaY of thE tip of thE ShuttlE drivEr Should BE 0.3 mm or lESS
and thE lowEr Shaft Should turn SmoothlY. aftEr thE adjuStmEnt, chEck thE
hook timing.
–0.05 to +0.10 mm
clEarancE Should BE Equal
ShuttlE racE
SEtScrEwS (B) (2)
lowEr Shaft
BuShing (front)
nEEdlE
ShuttlE
racE Spring
SEtScrEw (a)
lowEr
Shaft
BoSS
Page 17
17
ScrEw (a)
fEEd lifting pin
0.75–0.90 mm
nEEdlE platE
MECHANICAL ADJUSTMENT
FEED DOG HEIGHT
TO CHECk:
1. lowEr thE prESSEr foot.
2. turn thE handwhEEl toward You until thE nEEdlE Bar comES to thE fEEd
dog aBovE thE nEEdlE platE Should BE 0.75–0.90 mm.
if it iS not in thE rangE, adjuSt aS followS.
ADJUSTMENT PROCEDURE:
1. opEn thE ShuttlE covEr.
2. lowEr thE prESSEr foot and turn thE handwhEEl toward You until thE
fEEd dog comES to itS highESt point.
3. looSEn thE ScrEw (a) .
4. turn thE fEEd lifting pin to adjuSt thE hEight of fEEd dog (0.75–0.90 mm).
5. tightEn thE ScrEw (a).
6. turn thE handwhEEl toward You to rEchEck thE hEight of fEEd dog.
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MECHANICAL ADJUSTMENT
NEEDLE BAR HEIGHT
TO CHECk:
whEn thE tip of ShuttlE hook mEEtS thE lEft SidE of thE nEEdlE in aScEnding travEl
of thE nEEdlE from itS lEft and lowESt poSition, thE diStancE BEtwEEn thE top of
thE nEEdlE EYE and thE tip of thE ShuttlE hook Should BE in thE rangE of 2.9-3.5 mm.
ADJUSTMENT PROCEDURE:
1. rEmovE thE facE covEr.
2. SEt thE pattErn SElEctor dial at " ".
3. opEn thE ShuttlE covEr.
4. rEmovE thE ShuttlE racE ring.
5. turn thE handwhEEl toward You until thE tip of thE ShuttlE hook mEEtS thE lEft
SidE of thE nEEdlE.
6. looSEn thE lowEr Shaft crank arm ScrEw (a).
7. adjuSt thE hEight of thE nEEdlE Bar BY moving thE nEEdlE Bar upward or
downward without turning it.
8. tightEn thE ScrEw (a).
9. attach thE ShuttlE racE ring.
ScrEw (a)
nEEdlE Bar
tip of ShuttlE hook mEEtS
lEft SidE of nEEdlE
2.9–3.5 mm
Page 19
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MECHANICAL ADJUSTMENT
NEEDLE TIMING TO SHUTTLE
TO CHECk:
thE hEight of thE nEEdlE point from itS lowESt point of travEl Should BE
in thE rangE of 1.45-1.95 mm whEn thE tip of thE ShuttlE hook juSt mEEtS thE
lEft SidE of thE nEEdlE at thE lEft nEEdlE poSition.
ADJUSTMENT PROCEDURE:
1. SEt thE pattErn SElEctor dial at " ".
for modEl nExt 40, SElEct dial at " ", width SElEctor dial at " 0 ".
2. rEmovE thE BaSE (SEE pagE 7).
3. opEn thE ShuttlE covEr.
4. rEmovE thE ShuttlE racE ring.
5. turn thE handwhEEl toward You until thE tip of thE ShuttlE hook mEEtS
thE lEft SidE of thE nEEdlE.
6. looSEn thE lowEr Shaft crank arm ScrEwS (a).
7. whilE holding thE ShuttlE hook So it doESn't turn, turn thE handwhEEl
toward You until thE nEEdlE comES to itS lowESt poSition.
thEn, furthEr turn thE handwhEEl to raiSE thE nEEdlE aBout 1.7 mm from
itS lowESt poSition.
8. tightEn thE ScrEwS (a).
9. turn thE handwhEEl toward You to chEck if thE hEight iS in thE rangE of
1.45-1.95 mm.
if it iS not in thiS rangE, rEpEat thE aBovE procEdurE.
10. attach thE ShuttlE racE ring.
11. attach thE BaSE.
lowEr Shaft crank arm
ScrEwS (a) (2)
1.45–1.95 mm
lowESt poSition
lowEr Shaft
Page 20
20
a B
forward fEEding Backward fEEding
adjuSting ScrEw
(d) (c)
MECHANICAL ADJUSTMENT
BUTTONHOLE FEED BALANCE
TO CHECk:
whEn SEwing ButtonholE, thE StitchES on Each SidE of ButtonholE Should
BE thE SamE Stitch dEnSitY.
thE rangE of 9-12 StitchES in thE right SidE row (Backward fEEding)
againSt 10 StitchES in thE lEft SidE row (forward fEEding) iS conSidErEd
accEptaBlE.
ADJUSTMENT PROCEDURE:
1. chEck thE fEEd BalancE BY SEwing ButtonholES.
2. rEmovE thE cap on thE front covEr.
3. turn thE adjuSting ScrEw in thE dirEction of (c) in caSE of (a) (right StitchES
arE coarSE), or in thE dirEction of (d) in caSE of (B) (lEft StitchES arE coarSE).
4. mount thE cap.
Page 21
21
0.3 mm
cam followEr
cam followEr rElEaSing arm
SEtScrEw
convEx part
zigzag cam
pattErn SElEct cam
poSition (a)
poSition (B)
(c)
MECHANICAL ADJUSTMENT
DISENGAGEMENT OF CAM FOLLOWER
TO CHECk:
too narrow clEarancE BEtwEEn thE cam followEr and thE top convEx of
zigzag cam maY oftEn cauSE difficultY in turning of thE pattErn SElEctor
dial, thiS can alSo cauSE unintEndEd pattErnS to BEcomE SElEctEd or makE
zigzag Stitch in Straight Stitch SEtting.
ADJUSTMENT PROCEDURE:
1. rEmovE thE front covEr (SEE pagE 6).
2. mount thE pattErn SElEctor dial, and SEt it at pattErn " ". (5th cam aS viEwEd
from (c))
3. turn thE handwhEEl to put thE cam followEr onto thE top convEx of thE zigzag
cam.
4. looSEn thE SEtScrEw.
5. puSh thE convEx part of thE cam followEr rElEaSing arm in thE dirEction of
arrow until thE cam followEr rElEaSing arm touchES to poSition (a) of thE
pattErn SElEct cam, and thEn, tightEn thE SEtScrEw.
NOTE:
aftEr thiS adjuStmEnt, chEck that thE clEarancE BEtwEEn thE zigzag
cam and thE cam followEr iS 0.3mm whEn thE cam followEr rElEaSing
arm haS rEmovEd to poSition (B) BY turning thE pattErn SElEctor dial
countErclockwiSE, and alSo thE clEarancE BEtwEEn thE cam followEr and
thE zigzag cam Should BE 0.3mm.
6. rEmovE thE pattErn SElEctor dial, and mount thE front covEr.
Page 22
22
300g load
dEflEction 7-9mm
(B)
(a)
MECHANICAL ADJUSTMENT
MOTOR BELT TENSION
TO CHECk:
1. impropEr BElt tEnSion maY cauSE noiSE, ovErload of motor, Slow
running or motor BElt jumping.
2. thE BElt dEflEction Should BE 7 mm - 9 mm whEn prESSing thE middlE
of thE motor BElt with approximatElY 300 gramS of prESSurE.
ADJUSTMENT PROCEDURE:
1. rEmovE thE front and rEar covEr (SEE pagE 8, 9).
2. looSEn thE ScrEwS (a) and (B).
3. movE thE motor up or down to adjuSt thE dEflEction aBout 7 mm -9 mm.
4. tightEn thE ScrEwS (a) and (B).
5. attach thE front and rEar covEr.
Page 23
23
WIRING
1. wiring for machinE SockEt unit.
lm
m: motor
l: lamp
ml
120v 240v
Page 24
24
MODEL: NH15
PARTS LIST
1
2
33
35
3
6
25
44
7
45
46
47
48
49
13
14
29
31
32
26
4
24
19
4
37
38
7
12
40
41
40
42
43
20
18
34
27
30
16
15
12
12
28
10
7
8
5
11
22
21
6
6
6
28
36
23
9
39
17
Page 25
KEY PARTS
NO. NO. DESCRIPTION
25
PARTS LIST
MODEL: NH15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
310613909
310048701
310049001
000120203
810220003
000115205
000081005
000198305
000080901
000114709
000115009
745033013
310612805
310044132
310045708
310046008
000014306
310047009
730006000
745031000
000101404
000115607
000149301
310614704
310051006
310052007
310053008
000028107
730501011
735016307
000071013
000160814
652302004
652205006
735013108
000103510
310615808
310054401
310055701
000161206
310616706
310056001
310057703
310050005
735616200
735002001
000097901
000061319
739064003
Rear cover (unit)
Rear cover
Cover fixing plate
Tapping screw 3x8 (B)
Setscrew
Setscrew TP4x6
Setscrew 4x8
Setscrew 4x10 (B)
Setscrew 4x25
Setscrew TP3x6
Setscrew TP3x8
Cap
Front cover (unit)
Front cover
R button
R button spring
Snap ring CS-3
Bed lid
Spring
Thread guard plate
Setscrew 4x6
Setscrew TP4x8
Setscrew 3x8 (B)
Top cover (unit)
Top cover
Stitch guide
Carrying handle
Spring pin 4x25
Thread guide plate (unit)
Bobbin winder stopper
Washer
Setscrew 4x18
Spool pin
Spool pin
Spool pin cushion
Setscrew 4x10
Face cover (unit)
Face cover
Face cover plaque
Setscrew 3x10 (B)
Extension plate (unit)
Extension plate 1
Extension plate 2
Bottom cover
Rubber base (unit)
Rubber base
Flat screw 5x18
Nut
Bed rubber base
Page 26
26
MODEL: NH15
PARTS LIST
1
2
3
4
5
6
7
8
9
10
19
18
17
20
11
12
13
14
16
16
21
23
22
24
25
26
28
29
30
27
15
Page 27
KEY PARTS
NO. NO. DESCRIPTION
27
PARTS LIST
MODEL: NH15
305604200
735221008
735222009
000101404
000070506
000138307
303017101
735027002
735028003
000111500
735029004
000001609
735030008
000013903
735025000
000081005
310621003
310801009
301505002
660106001
739605002
739017001
739018002
739019003
000002105
310504700
310066004
000024505
000101703
000115205
Presser bar base plate (unit)
Presser bar base plate
Needle position set plate
Setscrew 4x6
Washer
Bolt 4x8
Presser bar
Presser bar spring
Presser bar bracket
Hexagonal socket screw 4x8
Presser foot lifter
Snap ring E-5
Tension release lever
Snap ring CS-5
Stopper
Setscrew 4x8
Presser foot (unit)
Foot holder (unit)
Zigzag foot (unit)
Thumb screw
Tension release arm (unit)
Tension release arm base
Tension release arm
Tension release spring
Snap ring E-3
Tension regulator (unit)
Thread guide
Spring pin 1.6x18
Setscrew 4x12
TP screw 4x6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Page 28
28
MODEL: NH15
PARTS LIST
1
2
3
4
4
5
6
7
8
9
10
11
12
13
13
14
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
34
Page 29
KEY PARTS
NO. NO. DESCRIPTION
29
PARTS LIST
MODEL: NH15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Face plate set plate
Setscrew 4x8
Needle bar supportaer spring
Setscrew 4x6
Lamp socket (unit)
Lamp 120V, 15W
Cord tie band
Needle bar supporter (unit)
Needle bar supporter
Needle bar supporter pin
Wave washer
Plain washer
Snap ring E-4
Hexagonal socket screw 3x4
Threader shaft
Guide pin
Washer
Threader shaft spring
Threader guide plate
Setscrew 3x4
Knock pin
Threader plate (unit)
Needle bar (unit)
Needle bar connecting stud (unit)
Threader set plate (unit)
Threader set plate
Threader base plate
Setscrew 2x4
Thread take-up lever (unit)
Thread take-up lever pin (unit)
Snap ring E-6
Needle bar crank pin (unit)
Hexagonal socket screw 5x5
Zigzag rod
Zigzag rod plain washer
Eccentric pin
Needle HA1-14
740007013
000081005
730024004
000101404
647513015
000009803
000053008
301611105
301032106
730022002
673022002
000070609
000002507
000111902
301034005
000122906
734107004
734094007
735196003
000101105
000003508
639643009
730503116
680504005
735628009
735197004
734102009
000097602
625506109
371511006
000002806
735504008
000111304
735119002
748021006
678084007
102408089
Page 30
30
MODEL: NH15
PARTS LIST
1
2
9
3
4
5
6
7
6
10
11
12
13
14
15
16
17
22
19
25
22
27
28
29
30
24
23
8
18
26
20
21
Page 31
KEY PARTS
NO. NO. DESCRIPTION
31
PARTS LIST
MODEL: NH15
310602008
102073003
000036717
732025001
639095000
000111304
749011109
000111201
761052007
731312005
304609006
304042005
743011008
304044007
304043006
000161309
000110107
732003003
000172602
743029009
310069007
000024206
502064003
502065004
303025009
000030205
310619709
310007708
743030003
000121400
Upper shaft (unit)
Setscrew
Thrust washer
Upper shaft front bushing
Ring
Hexagonal socket screw 5x5
Worm
Hexagonal socket screw 4x4
Setscrew
Felt
Crank rod (unit)
Feed cam
Crank rod
Crank cam
Crank cam plate
Tapping screw 3x12 (B)
Hexagonal socket screw 5x5
Upper shaft rear bushing
Setscrew 5x8
Felt
Felt clip
Spring pin 3x30
Clutch ring
Clutch spring
Belt wheel
Snap ring E-8
Handwheel (unit)
Handwheel
Balance weight
Tapping screw 3x14 (B)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Page 32
32
MODEL: NH15
PARTS LIST
9
10
11
12
6
6
13
8
8
28
23
24
25
26
20
20
19
21
18
17
16
27
23
22
4
5
1
3
2
7
6
8
14
23
15
Page 33
KEY PARTS
NO. NO. DESCRIPTION
33
PARTS LIST
MODEL: NH15
310601007
310001001
310501006
310003003
000120203
000001609
505071002
000081005
310610009
737011009
000103808
310043175
310043245
310620002
000002507
735077007
735073003
000013800
648010009
000160102
739020007
310058003
000002105
735074004
735076006
000071013
000172602
670100006
Bobbin winder support plate (unit)
Bobbin winder support plate
Bobbin winder arm (unit)
Clutch opener plate
Setscrew 3x8 (B)
Snap ring E-5
Bobbin winder arm spring
Setscrew 4x8
Zigzag mechanism (unit)
Index spring
Setscrew 3x5
Pattern selector dial
Stitch length dial
Feed regulator (unit)
Snap ring E-4
Feed regulating body spring
Plain washer
Snap ring CS-6
Setscrew
Adjustable locknut 4
Feed regulating rod
Reverse link
Snap ring E-3
SS adjusting screw
SS rod block
Washer 4
Setscrew 5x8
Feed regulator spring
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Page 34
34
MODEL: NH15
PARTS LIST
1
2
3
4
4
5
6
7
8
9
10
11 12 13
14
8
4
15
16
17
8
8
18
19
Page 35
KEY PARTS
NO. NO. DESCRIPTION
35
PARTS LIST
MODEL: NH15
744004001
681009101
735950003
000110107
000036201
735233003
735061008
000111304
735236006
822070003
735234004
639036003
639037004
000001609
000172602
735610101
532096007
647515006
102261000
Needle plate
Setscrew
Lower shaft gear (unit)
Hexagonal socket screw 5x5WP
Washer 8-0.5
Bushing
Feed lifting cam
Hexagonal socket screw 5x5
Lower shaft
Felt (1)
Bushing
Lower shaft crank arm
Pin
Snap ring E-5
Setscrew 5x8
Shuttle race body (unit)
Shuttle hook
Bobbin case (unit)
Bobbin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Page 36
36
MODEL: NH15
PARTS LIST
1
2
3
4
5
6
7
8
6
9
10
10
11
11
12
12
22
23
24
25
26
27
6
13
14
15
16
6
17
18
19
20
21
Page 37
KEY PARTS
NO. NO. DESCRIPTION
37
PARTS LIST
MODEL: NH15
735612000
735078008
735079009
735080003
000002507
000111201
735081004
735082005
735083006
735084007
735085008
000101404
301608006
301027005
735087000
735088001
735089002
735090006
000101703
739022009
000081119
743012009
743013000
102141003
735071104
000002806
735276008
Feed rock shaft (unit)
Feed rock shaft
Feed bar
Feed bar shaft
Snap ring E-4
Hexagonal socket screw 4x4
Feed dog
Setscrew
Feed bar spring
Feed rock shaft center
Feed rock shaft center plate
Setscrew 4x6
Feed lifting arm (unit)
Feed lifting arm
Feed lifting pin
Feed lifting roller
Feed lifting spring
Feed lifting shaft
Setscrew 4x12
Feed lifting shaft holder
Setscrew 4x6
Feed rod
Feed rod spring
Feed regulator slide block
Feed rock shaft connecting pin
Snap ring E–6
Ring
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Page 38
38
MODEL: NH15
PARTS LIST
1
2
3
9
5
8
6
7
4
Page 39
KEY PARTS
NO. NO. DESCRIPTION
39
PARTS LIST
MODEL: NH15
743612005
014170108
000115504
739505403
000060802
739037007
000107802
000103509
650166008
Motor (unit)
Motor
Setscrew TP5x10
Machine socket (unit)
Nut
Machine socket cover
Setscrew 3x10 (B)
Setscrew 4x10
Timing belt
1
2
3
4
5
6
7
8
9
Page 40
40
MODEL: NH15
PARTS LIST
2
8
1
4 5
7
6
3
9
10
11
Page 41
KEY PARTS
NO. NO. DESCRIPTION
41
PARTS LIST
MODEL: NH15
1
2
3
4
5
6
7
8
9
10
11
310870009
647803004
102261000
647808009
639804000
735801008
611413002
611406002
611411000
C-1028
310800260
Accessory set
Screwdriver (small)
Bobbin
Seam ripper (unit)
Needle set (unit)
Darning plate
Buttonhole foot (unit)
Zipper foot (unit)
Blind foot (unit)
Foot control
Instruction book
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