JUKI TL-2010Q User manual

SERVICE Manual
Tl-2010Q/2000Qi
1-nEEDlE lOCKSTITCH SEWInG MaCHInE WITH
auTOMaTIC THREaD TRIMMER FOR PROFESSIOnal

CONTENTS
[1] SPECIFICATIONS OF TL-2010Q/2000Qi....................................................... 1
[2] NAMES OF COMPONENTS ........................................................................... 3
[3] DISASSEMBLY AND ASSEMBLY .................................................................. 3
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT) ............. 15
[5] ADJUSTMENTS OF COMPONENTS ........................................................... 16
WARNING :
To avoid the risk of re, electric shock, injury to persons or damage to components, especially keep the
following :
• When disassembling, assembling or adjusting the sewing machine, remove the power plug.
• When assembling, be careful about the electrical cord being caught with other components,
damage to the covered parts of the cord or miswiring.
• When replacing the part(s), use the genuine part(s).

–1 –
[1] SPECIFICATIONS OF TL-2010Q/2000Qi
(1) Power switch
ON•OFF 2-step changeover switch (common to lamp) located at the belt cover section of the right-hand
side of main unit.
(2) Drive control components
Drive : Built-in motor timing belt method
Control : Foot pedal controller method 50 to 1,500 sti/min
Low speed rotation of 50 sti/min while needle up/down switch is ON
(3) Table, stand and handle components
Main unit : Portable type main unit with soft case (Case is folded in two and packed with main unit.)
One-touch type auxiliary table knee lifter is provided as standard. (Packed together)
Handle : Pull-up/down from machine main unit type
Table/stand: Separately sold fully-sunken type table and stand can be used.
(4) Arm and bed components
Material : Aluminum die casting arm and bed separate body type
Bed form : Flat bed portable type
(5) General mechanism
1. Thread take-up : Slit type link thread take-up for one-touch threading
2. Hook : DB type horizontal full-rotary hook
3. Pressing pressure adjustment : Stepless adjusting screw with pressing pressure indicator method
4. Lighting device : Built in face cover Switch : Slide type Lamp : Halogen lamp
5. Needle thread post : Two posts for small thread spool and large thread spool
Thread guide of thread post is of draw-out type and capable of
one-touch threading
6. Bobbin thread winder : One-touch action : Starting method by controller Automatic stop when
bobbin thread winding completed
7. Needle thread threading : One-touch threading from thread spool to needle tip
8. Presser foot : Commercially-available presser foot for industrial sewing machine
(SL2) can be used. (Setscrew type)
9. Lift of presser foot : By lever : 7 mm Max. by lever : 10 mm By knee lifter : 12 mm
10. Thread tension : Disk pressure adjusting type with simplied disk pressure scale
11. Drop feed : 2-step changeover by knob method (Feed dog : UP : DOWN)
12. Power switch : ON • OFF 2-step
(6) Feed mechanism
1. Feed amount adjustment : Dial method ...... Stepless 0 to 6 mm
2. Reverse feed stitch : Lever method .... Feed amount conforms to that of normal feed stitch.

–2 –
(7) Special mechanism
1. Automatic thread trimming : Thread trimming switch is used in common for pushbutton type and
for external foot pedal switch type.
Switch fails to work even when pressing it within two seconds after
the rotation of thread trimmer.
2. Needle bar stop position : Electric brake stop method
Stop by controller : Down stop
Stop by automatic thread trimming : UP stop
Stop by bobbin winder : UP stop
3. Automatic needle hole threading : Hook section rotates and automatically returns by lowering threading
lever.
4. Needle up/down switch : Switch is of pushbutton type and up/down stop can be performed by
half rotation of main shaft when operating switch for a short period of
time. When switch is continuously held ON, sewing machine
continuously runs at a speed of 80 sti/min until switch is turned OFF.
5. Prevention of reverse setting of needle : Needle is attachable to normal direction only.
6. Motor protection
Overcurrent : When motor is locked for 0.5 to 1 second due to sudden overload,
motor power is automatically turned OFF and returns to the ON state
immediately.
Overheat : When motor temperature has abnormally risen, motor power is turned
OFF(thermal cut) and returns to the ON state when temperature has
fallen.
(8) Dimensions and weight
Main unit : 452W x 219L x 350H (mm)
Weight : 11.5kg
(9) Power consumption
Whole sewing machine : 120V 1.4A 60Hz

–3 –
[2] Names of Components
[3] Disassembly/assembly
Page
Outer Components
1. Arm cover asm. ...................................... 4
2. Belt cover and motor cover .................... 4
3. Face plate asm. ...................................... 4
4. Bed cover mas. asm. .............................. 5
5. MAIN circuit board asm. ......................... 5
Function components
1. Motor asm. and transformer asm. .......... 5
2. Handwheel and clutch ............................ 6
3. Thread tensioner asm. ........................... 6
4. Presser bar ............................................. 7
5. Needle bar .............................................. 7
6. Thread take-up ....................................... 8
7. Reverse feed stitch lever ........................ 8
8. Idler ........................................................ 8
9. Stitch dial ................................................ 9
10. Automatic thread trimming switch case .. 9
Page
11. Wire holder ............................................. 9
12. Knee lifter lever .................................... 10
13. Hook driving shaft pulley ...................... 11
14. Hand lifter lever .................................... 12
15. Drop-feed knob ..................................... 12
Automatic thread trimming components
1. Looper mas. asm. ................................. 13
2. Moving knife arm
installing plate mas. asm. ..................... 13
3. Moving knife base mas. asm. ............... 14
4. Thread trimming solenoid mas. asm. ... 14
Indicating needle of
presser spring regulator
Face cover
Pressure indicating plate
Thread take-up thread guide
Thread take-up spring
Presser bar connection thread guide
LED lamp
Needle bar thread guide
Needle bar thread bracket
Presser spring regulator
Thread guide base
Side cover
TL-2000Qi
Thread guide No.1
Standard presser foot asm.
Arm cover asm.
Throat plate asm.
Bobbin winder shaft
Thread take-up spring adjusting plate
Belt cover
Handwheel
Stitch dial
Speed limit vr knob (only for TL-2010Q)
Automatic thread trimming switch
Reverse feed stitch lever
Hole for knee lifter lever setting
Bed cover rubber seat
Bed cover
Drop-feed knob
Thread guide rod
Needle threader lever
TL-2010Q
First tention
Needle up/down switch
Hand lifter lever

–4 –
1. Arm cover asm.
3. Face plate asm.
Preparation
™Remove arm cover.
2. Belt cover and motor cover
Outer Components
1Arm cover setscrew
SM5042005SN
3Arm cover
6Convex of presser
spring regulator knob 5Slit of presser regulating screw
3Face plate asm.
1Lamp connector
5Face cover
2Face plate asm. setscrew
SL5040631SE 6Hand lifter lever spring
4Indicating needle of
presser spring regulator
2Motor cover setscrew
SM5041255SN
1Belt cover setscrew
SM5041255SN
4MAIN circuit
board case cover
2Bobbin
winder
connector
Disassembly Assembly Point
™Remove two 1setscrews.
™Disconnect and remove 2con-
nector.
™Insert 2connector.
™Align 6convex with 5slit and
tighten the setscrew.
™There should be no torsion or
distorsion in presser spring regu-
lator.
™Align precisely slit portion with
convex portion.
™Do not press each lead wire.
Disassembly Assembly Point
™Remove four 1setscrews and
remove belt cover.
™Remove three 2setscrews and
remove motor cover.
™Attach belt cover and tighten 1
setscrews.
™Attach motor cover and tighten
2 setscrews.
™There should be no difference
in level between belt cover and
front face of frame.
™Make motor cover come closely
contact with belt cover.
Disassembly Assembly Point
™Disconnect 1connector and 6
remove.
™Remove 2setscrews and re-
move 3face plate asm.
(together with face cover).
™Attach 3face plate asm., tighten
it with face plate asm. 2set-
screws, and attach 6hand lifter
lever spring.
™Insert 1connector.
™There should be no difference in
level around the cover when face
cover is closed.
™
5should not come in contact
with 4indicating needle.

–5 –
5. MAIN circuit board asm.
Preparation
™Remove arm cover asm.
™Remove MAIN circuit board case
cover and lamp connector.
Note) 3Setscrew to set the
circuit board and cover
to circuit board case
Do not insert in the
reverse direction.
(See page 15.)
Do not loosen this
screw.
4. Bed cover mas. asm.
1. Motor asm. and
transformer asm.
Preparation
™Remove arm cover asm.
™Remove belt cover and
motor cover respectively.
Make a memorandum of
cord wiring.
1Bed cover setscrew
SM5051255SN
1Bed cover setscrew
Function Components
2Power
transformer
setscrew
SM5040855SN
3Motor setscrew nut
1Motor asm.
setscrew
SM5050855SN
5-1
5Cord guide
plate setscrew
SM5030655SN
4
2MAIN circuit board case setscrew A
SL5030831SF
3MAIN circuit board setscrew
4MAIN circuit board case
setscrew B SM5031401SE
Porality exists.
Never loosen this screw.
6clip band (3 places)
Disassembly Assembly Point
™Remove six 1setscrews and re-
move bed cover.
™Attach bed cover and tighten set-
screws.
Disassembly Assembly Point
™Remove 7 connectors of each
lead wire.
™Cut 6clip bands (3 places).
™Remove 2setscrews and 4set-
screw, and remove circuit board.
™Press play of circuit board to at-
tach circuit board to the front side
and tighten two setscrews.
™Insert each lead wire into con-
nectors.
™Read the note and understand it.
™Ther are color indications on the
circuit board for inserting connec-
tors.
Disassembly Assembly Point
™Remove cord guide plate 5set-
screws and 5-1 in previous item,
and cut 6clip band.
™Loosen 4cord presser.
™Remove two 1setscrews and
remove motor asm.
™Remove two 2setscrews and
remove transformer asm.
Make sure of wiring route.
™Attach transformer and tighten
3setscrews.
™Attach motor asm. and tighten
1setscrews.
™Fix it with 4cord presser.
™Attach cord guide plate asm. and
tighten 5and 5-1 setscrew.
™Connect cord guide plate and
cord.
™Loosen 3nuts to adjust motor
tension.
™Belt tension : the belt should sag
3 to 4 mm when center of belt is
applied with 1.96N load.

–6 –
2. Handwheel and clutch
Preparation
™Remove belt cover.
™Remove arm cover.
9Motor pulley
6Groove of
handwheel bushing
8Handwheel bushing stopper pin
4Angle portion of clutch spring
7Convex of handwheel bushing
3Groove of clutch spring support
!0 Groove of handwheel
3. Thread tensioner asm.
Disassembly
™Remove 1setscrew.
™Remove cord guide plate set-
screw and remove cord guide
plate asm.
™Remove 3spring support.
™Move 4in the direction where
clutch spring is released and re-
move clutch spring.
™Face 6to motor side and 8is
hard to drop.
™Draw out 8and remove 9.
Assembly
™Attach 9and enter 8.
™Enter 6groove of bushing to 8
stopper pin and attach bushing.
™Enter 5hook portion of spring
to slit in the center of handwheel
bushing
™Enter 5clutch spring to 3
groove of spring support and at-
tach cord guide plate asm. Then
tighten setscrew.
Point
™Align 7convex of bushing with
!0 groove of handwheel and at-
tach handwheel. Then tighten
setscrew.
™Clearance provided between con-
vex of 3clutch spring support
and clutch plate is 2 ± 0.5 mm.
™See item 12 on page 19 for ad-
justment.
1Handwheel
setscrew
2Handwheel
Disassembly
™Remove 1setscrew.
™Lower presser foot and remove 2
setscrew.
™Remove 3spring together with
4thread tensioner asm. and ad-
justing plate.
Assembly
™Attach 6adjusting plate and 3
spring to thread tensioner asm.
and attach it to frame. Then x it
with 2setscrew.
™Tighten 1adjusting plate set-
screw.
Point
™Place upward the scale of 5
thread tension disk presser.
™See items 9 and 10 on page 19
for adjustment of pressure and
thread take-up spring of stroke.
1Thread take-up spring
adjusting plate setscrew
SL5030801SN
2Thread tensioner setscrew
SM8040602TP
3Thread take-up spring
4Thread tensioner asm.
5Thread tension disk presser
5Hook portion of clutch spring
6Thread take-up
spring adjusting
plate
When removing motor
pulley, remove cord guide
plate setscrews 5and 5-1
in previous item.

–7 –
4. Presser bar
Preparation
™Remove arm cover asm.
™Remove face plate mas. asm.
™Remove presser foot and setscrew.
Disassembly
™Lower 8lever and loosen 1set-
screw.
™Drawing 3u p w a r d , r e m o ve 4
spring.
™Remove 5connection and 6lever.
™Remove regulator 2screw.
™Do not remove 7indicating needle.
3is hard to remove since secrew
mark is attached.
Assembly
™Attach regulator 2screw.
™Set 6lever to frame, and then
set 5connection.
™Attach 4spring when setting
3presser bar from upper side.
Point
™Set 4spring under 7indicating
needle.
™Lower 8lever and temporarily
tighten it at the position where top
end of 3protrudes approximately
4 mm from frame.
For the adjustment, see item 3 on
page 17.
™Needle should not interfere with
presser foot.
Disassembly
™Remove 3and 4.
™Remove 1felt. (Push up needle
bar upper bushing 1felt with 5
and draw it out.)
™Loosen setscrew of 2and 6.
(Pushing needle bar 5upward is
acceptable.)
™Draw out 5upward.
™Remove left 6screw and remove
crank rod.
Assembly
™Attach crank rod and tighten it with
6.
™Perform positioning of needle bar
and tighten needle bar connection
2setscrew.
™Set needle bar and attach 4and
3.
™Insert 1into hole.
™Temporarily tighten 6, and perform
adjustment of vertical height after
attaching threader support plate
asm.
Point
™Position of needle bar is the
place where upper engraved
line of needle bar is aligned
with lower end face of needle
bar bushing at the needle lower
dead point.
See item 2 on page 17 for the
adjustment.
™See item 15 o n page 22 for
height adjustment of threader
hook of threader support plate
mas. asm.
6Presser bar lifting lever
8Hand lifter lever
3Presser bar
2Presser spring regulator
7Indicating needle of
presser spring regulator
4Presser spring
5Presser bar connection asm.
1Presser bar connection setscrew
SM8060502TP
Threader support plate
setscrew (upper)
SL5040631SE
Threader support plate mas. asm.
Threader support plate
setscrew (lower)
SM4040655SN
5. Needle bar
Preparation
™Remove arm cover asm.
™Remove face plate mas. asm.
™Remove presser bar.
™Remove needle bar threading
guide as well.
Needle bar crank
left screw
1Needle bar upper bushing felt
2Needle bar connection setscrew
SM8060510SP
6Needle bar threader guide setscrew
5Needle bar
3Needle bar thread bracket
setscrew A1420-001-000
4Needle clamp

–8 –
7. Reverse feed stitch lever
Preparation
™Remove belt cover.
8. Idler
Preparation
™Remove belt cover.
Disassembly
™Remove 1setscrew and remove
idler asm.
Assembly
™Assemble idler and tighten it with
1setscrew.
™Belt tension : Belt sags 6 to 7 mm
when center of the belt is applied
with a 1.96N load.
Point
™Belt tension can be changed only
by removing belt cover. Move 2
convex portion to the left or right.
Disassembly
™Remove 1spring from arm.
™Remove two 2setscrews.
™Remove 4lever arm from the
slot of 5regulator when remov-
ing 3.
Assembly
™Attach 3lever and set with 2
setscrews.
™Hook lever spring 1to lever arm
4.
Point
™Set 4lever arm to the slot of 5
regulator.
Disassembly
™Loosen 1setscrew.
™Loosen two 2setscrews.
™Draw out thread 3take-up sup-
porting shaft.
™Remove 5and 6together with
4needle bar crank.
Assembly
™Set needle bar crank to thread
take-up, attach it onto main unit
and tighten setscrews (2 pcs.).
™Set 6to 5, enter thread take-up
supporting shaft 3to 6, attach
it onto frame and tighten 1set-
screw.
Point
™Tighten setting portion (flat por-
tion) of needle bar crank with
screw No. 1.
™Press 3shaft to frame side while
viewing the torque and tighten 1
setscrew.
6. Thread take-up
Preparation
™Remove arm cover asm.
™Remove face plate mas. asm.
™Remove presser bar.
™Remove needle bar.
2Convex portion of idler installing plate
1Idler setscrew
SM5040855SN
5Feed regulator
1Reverse feed
stitch lever spring
4Reverse feed
stitch lever arm
2Needle bar
crank setscrew
5Thread take-up
1Thread take-up supporting shaft setscrew
SM8050602TP
3Thread take-up
supporting shaft
4Needle bar crank
6Thread take-up
support
3Reverse feed stitch
lever mas. asm.
2Reverse feed stitch lever
setscrew SM5040855SN

–9 –
9. Stitch dial
Preparation
™Remove arm cover asm.
10.Thread trimming switch case
Preparation
™Remove arm cover asm.
™Remove motor cover and belt cover.
™Remove motor mas. asm.
1Thread trimming switch
circuit board case setscrew
SL4040655SN
11.Wire holder
Preparation
™Remove outer components.
(Excluding belt cover and
motor cover)
™Remove presser bar.
3Feed regulating screw
stopper asm. setscrew
5Feed regulating screw
• Stopper screw
• Stopper nut
Disassembly
™Loosen two 1setscrews and re-
move the dial.
™Be careful since 2pin jumps.
™
3may not be removed.
(Stopper screw SM8031400TP)
Assembly
™Turn regulating 4screw full to
the right.
™Assemble stitch dial with its scale
0 up and tighten 1screw (2
pcs.).
Point
™There should be no play in feed
regulator when operating lever.
(When scale is 0.)
™Loosen 5stopper nut. Make
stopper screw strike against regu-
lating 4screw and tighten nut.
2Feed regulating
pin
1Stitch dial setscrew
SM8030402TP
4Feed regulating screw
Disassembly
™Remove two 1setscrews in
thread trimming switch case.
™Remove thread trimming switch
case.
Assembly
™Attach the switch case to frame
and tighten with 1setscrews.
Point
™There should not be no torsion
between switch and frame.
1Nut of setscrew
(opposite side 9 mm)
NS6620310SP
2Wire tube presser setscrew
SM4040655SN
3Wire holder setscrew
SM5040855SN
5Disk pressure release
connecting link
4Thread release plate 6Thread release plate shaft

–10 –
12. Knee lifter lever
Preparation
™Remove outer components.
(Excluding belt cover and motor cover)
™Raise presser foot.
Disassembly
™Remove snap 4pin.
™Remove 5setscrews and re-
move 6.
™Remove 1setscrew and take out
lever spring.
™Lower 2and turn it to the posi-
tion where 3can be removed.
™Remove 3, remove claw lever
actuating plate, and draw out 2.
™Remove claw lever shaft 7set-
screw.
™Remove 8link asm..
Assembly
™Attach 8to frame and tighten 7
setscrews.
™Set 2lever shaft, attach 9claw
lever actuating plate and tighten it
with 3.
™Attach lever spring and tighten
with 1.
™Raise frame, attach 6knee lifter
lever to knee lifter lever !0 shaft,
and tighten it with 5.
™Enter 4snap pin.
Point
™There should not be a play in the
axial direction of 2knee lifter le-
ver shaft.
Disassembly
™Remove 1nut (left side only).
™Remove 2setscrew and remove
tube presser.
™Remove 3setscrews and re-
move wire holder mas. asm.
™Remove setscrew in thread re-
lease 6plate shaft and remove
thread release 4plate.
When removing the wire from
frame, make sure of wire route in
frame.
Assembly
™Lay wire in frame.
™Connect thread release 4plate
with disk pressure release con-
necting 5link.
™Assemble wire holder mas. asm.
and tighten with 3setscrews.
™Fix 2and 1in the reverse side
of machine bed.
Point
™Pass the wire through full reverse
side of stitch dial.
™Contact 4and 5with each oth-
er.
™For 2, tube has to come out by
13 mm from tube presser.
™Tube presser and tube regarding
2should be on the same face.
See item 5 on page 27 for 1.
2Knee lifter lever shaft 8Knee lifter link asm
(claw lever plate)
7Claw lever shaft
setscrew
SM5041255SN
3Claw lever actuating plate
setscrew SM8040602TP
6Knee lifter lever
5Knee lifter lever shaft stop
plate setscrew
SM5040855SN
4Knee lifter link snap pin
1Knee lifter lever shaft spring setscrew
SM5030455SF
!0 Knee lifter
lever shaft
9Claw lever
actuating
plate

–11 –
13. Hook driving shaft pulley
Preparation
™Remove outer components.
(Excluding stop solenoid)
™Loosen idler.
™Remove needle.
8E-ring groove
6
4
5
!0 Moving knife roller arm
!1 Thread trimmer cam
2Hook driving shaft pulley eccentric shaft setscrew
SM8040602TP
Hexagon 2.0 mm
5Hook driving shaft pulley eccentric shaft
9Thread trimmer cam screw No. 1 3Hook driving shaft pulley E-ring (E-6)
6Hook driving shaft pulley
eccentric shaft bushing
Slit on 4hook driving shaft pulley
eccentric shaft
1Timing belt
Disassembly
™Remove timing belt from main
shaft pulley.
™Remove 1belt and loosen two
2setscrews.
™Remove 3E-ring and turn 4to
find a place where backlash in
hook driving shaft pulley is large.
™Press 5and push out 6bushing
to the right side.
™Draw out 5and 6, and remove
7following the point of 7.
Do not make a aw on 8E-ring
groove when removing 3E-ring.
Assembly
™Enter hook driving shaft 7pulley.
™Enter eccentric 5shaft and 6.
™Set 3E-ring.
™Remove the play in hook driving
shaft with 6and tighten 2set-
screw B.
™Turn 4shaft slit to adjust back-
lash in pulley and tighten 2set-
screw A.
™Set 1belt.
Adjust backlash in eccentric shaft
by right rotation.
Point
When setting 6bushing, do not
make a flaw on the end face of
bushing.
When setting belt onto main shaft,
refer to thread trimming timing.
(Simple method)
™Lower needle bar 1.95 mm from
its upper dead point.
™Turn hook driving shaft and orient
9screw No. 1 to this side (just
front).
™Enter contact of !0 roller arm to
groove of !1 cam.
™Turn hook driving shaft in the re-
verse direction and set belt at the
position where it stops.
(Illustration of hook driving shaft pulley)
AB
Make 7hook driving shaft pulley
come out downward.

–12 –
15. Drop-feed knob
Disassembly
™Set 1drop-feed knob to "NOT
FEED", remove 4drop feed knob
shaft setscrew, and remove 3
E-ring of drop feed knob.
™Remove 2DF adjusting arm
spring while removing 6DF ad-
justing arm asm..
Assembly
™Pass 1drop feed knob through
5wire installing plate.
™Assemble 2DF adjusting arm
spring while assembling 6DF
adjusting arm asm..
™Place 3E-ring to 1drop feed
knob.
™Assemble drop feed knob shaft
with 4setscrew.
Point
™It is easy to remove 2spring
when 1drop-feed knob is set to
“NOT FEED” side.
3 E-ring
5 Wire installing plate asm.
2 DF adjusting arm spring
6 DF adjusting arm asm.
1 Drop-feed knob
14. Hand lifter lever
Disassembly
™Loosen hand lifter lever shaft set-
screw 4.
™Insert M4 screw 3into tapped
hole in hand lifter lever shaft 2by
3 to 4 screw threads.
™Hold screw head and draw out the
screw.
™At the same time, also draw out
hand lifter lever shaft.
™Remove hand lifter lever 1.
Assembly
™Put hand lifter lever shaft 2into
the hole in the frame.
™Secure hand lifter lever shaft 2
by tightening hand lifter lever
shaft setscrew 4in such a way
that the tip of setscrew 4comes
in contact with the flat part on
hand lifter lever shaft 2.
Point
™End face aof hand lifter lever
shaft 2should not jut out from
the frame surface.
1Hand lifter lever
2Hand lifter lever shaft
3M4 screw
4 Drop feed knob shaft setscrew
4Hand lifter lever shaft set screw
a
Flat part

–13 –
Automatic Thread Trimming Components
1. Looper mas. asm.
Preparation
™Remove bed cover.
2. Moving knife arm installing plate mas. asm.
Preparation
™Remove bed cover.
™Remove 2looper mas. asm..
™Remove moving knife arm 6spring.
3Nut (9 mm) of wire
setscrew
1Moving knife link shaft A
E-ring E-4
5Moving knife link
4Moving knife arm installing plate
mas. asm. set screw SM4050855SP
6Moving knife arm spring
Disassembly
™Remove 1E-ring.
Do not remove 5moving knife
link. (Remove together with moving
knife arm installing plate.)
™Remove 3nut on the left side
only.
™Remove thread trimmer clutch
plate 7collar setscrew and 8
thread trimmer clutch plate collar.
™Remove two 4screws and re-
move installing plate mas. asm.
At this time, simultaneously re-
move moving knife link.
(To prevent moving knife link from
warping)
Assembly
™Attach moving knife arm installing
plate mas. asm.
Note : See the point on the right side.
™Temporarily tighten 4setscrews.
™Attach 1E-ring of link shaft.
™Temporarily tighten 2looper
mas. asm..
™Attach 6moving knife arm
spring.
™Determine position of moving
knife and securely tighten 4.
Note : Refer to assembling of moving
knife and looper mas. asm.
Point
™Set 1moving knife link and wire
3setscrew.
™Position of moving knife
Remove hook and see from the
reverse side of bed.
(See item 1 on page 23.)
™See item 5 on page 27 for ad-
justment of 3nut of wire.
5Looper mas. asm.
setscrew
SM5040855SN 3Looper link asm.
2Looper link holding shaft
(Washer A1731090000
E-ring E-3)
4Moving knife
arm spring
1Looper link B
E-ring E-3
Disassembly
™Remove 1E-ring.
™Remove E-ring and washer of 2.
™Remove looper link asm of 3.
™Remove moving knife arm spring
of 4.
™Remove setscrews of 5and re-
move looper mas. asm.
Assembly
™Attach looper mas. asm. and
tighten 5setscrews. (Adjust
looper link B shaft to hole.)
™Hook moving knife arm 4spring.
™Set looper link and attach E-ring,
washer, etc.
Point
™Place 6looper in the center 7
of inner hook and securely tighten
5.
See i tem 4- 2 on pag e 27 for
adjustme nt of looper movi ng
amount.
7Bobbin case
(Center of inner hook)
6Looper
2Looper
mas.asm
8Thread trimmer clutch
plate collar
7Thread trimmer clutch plate
collar setscrew

–14 –
Disassembly
™Remove washer, E-ring, eccentric
shaft and setscrews of 1thread
trimmer solenoid link A.
™Remove 1thread trimmer sole-
noid link A.
™Remove three setscrews in thread
trimmer solenoid asm. to take it
out.
* It is easy to remove setscrews
when top end of thread trimmer
auxiliary link is moved to the right-
hand side of thread trimmer auxil-
iary cam.
Assembly
™Attach thread trimmer solenoid
and temporarily tighten it with 3
setscrews.
™Adjust clearance between pin at
top end of thread trimmer auxil-
iary link and thread trimmer aux-
iliary cam to 0.5 to 1.0 mm and
securely tighten 3setscrews.
™Fix 1thread trimmer solenoid
link A with eccentric shaft, washer
and E-ring.
(See item 2 on page 23 and item
3-5 on page 24 for the adjustment.)
Point
™Move thread trimmer solenoid
asm. to the left and right so that
pin at top end of thread trimmer
auxiliary link comes in contact
with thread trimmer auxiliary
cam when the solenoid performs
suction and securely tighten set-
screws.
* Solenoid has to properly work
when the solenoid performs suc-
tion.
4. Thread trimmer solenoid mas. asm.
Preparation
™Remove outer components.
(Remove arm cover asm., belt cover, motor
cover and cord guide.)
™Remove solenoid cover.
™Remove washer, E-ring and eccentric shaft of
thread trimmer solenoid link A.
3Thread trimmer solenoid
mas. asm. setscrew
SM5040655SN
5Moving knife
roller arm 4Moving knife arm
1Thread trimmer
solenoid link A
Washer and E-ring
3. Moving knife base mas. asm.
Preparation
™Remove bed cover.
™Remove throat plate asm.
Disassembly
™Remove 1E-ring and raise
frame.
™Remove two 2setscrews.
™Bring 3feed dog to its highest
position.
™Raising moving knfe base by
hand, lightly press moving knife
link A from upper side.
(Release coupling.)
Assembly
™Attach moving knife base to frame
while setting moving knife base to
moving knife link shaft A.
™Temporarily tighten 2setscrews.
™Push moving knife base in the
direction of right rear 45˚ and se-
curely tighten it.
™Tilt frame, set moving knife link
shaft A and enter 1E-ring.
Point
™When assembling, it is better to
raise by nger moving knife link A
from below.
1Moving knife link
shaft A E-ring
2Moving knife
base mas. asm.
setscrew
SM4040855SP
3Feed dog
Eccentric shaft setscrew

–15 –
(Caution) 1. CN Nos. in frame of MAIN circuit board denote connector Nos. in MAIN circuit board.
2. Portions enclosed with thick lines denote circuit boards.
3. Numerals outside of frame of MAIN circuit board denote number of lead wires.
CN1
CN2
CN4
CN3
CN5
CN6
CN7
CN8
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT)
2
(AC 22V),
(AC19.8V)
Controller
Thread trimmer
socket
External thread
trimmer SW
Controller
socket
Bobbin winder SW
Thread trimmer
solenoid
Lamp SW
FILTER
circuit board
Power SW
Motor
MP detection
circuit board
MAIN
circuit board
Lamp
CN11 Thread trimmer
SW circuit board
3
3
2
33
22
2
4
2
CN5
CN3
CN7
CN1
CN6
CN2
CN8
CN4
CN9
2
2
Transformer
CN22
2
CN21
CN23
AC120V
AC120V
Plug socket
(MAIN circuit board)
CN9
3
VR for speed
limiting
Description MAIN circuit board Cord color
Terminal Pin
Motor CN7 1 Blue
3 Brown
5 Black
Power connecting
wire
CN9 1 Blue
2 Brown
Transformer CN8 1 Yellow
secondary side 2 Yellow
(AC 22V, 19.8V) 3 Red
4 Red
Lamp CN2 1 Gray
2 Gray
Bobbin winder SW CN1 1 Purple
2 -
3 Gray
MP detection circuit CN6 1 Black
board 2 -
3 Red
Thread trimmer SW CN3 1 Orange
circuit board 2 -
3 Brown
Description MAIN circuit board Cord color
Terminal Pin
Controller socket CN5 1 Yellow
2 White
Thread trimmer CN4 1 Blue
solenoid 2 Blue
VR for speed limiting CN10 1 Red
2 Yellow
3 Black
Description FILTER circuit board Cord color
Terminal Pin
Transformer Primary CN21 1 White
side (AC 120V) 2 Blue
Power connecting CN22 1 Brown
wire 2 Blue
Power input CN23 1 Blue
(AC 120V) 2 Yellow
Description
Thread trimmer SW circuit board
Cord color
Terminal Pin
External thread CN11 1 Black
trimmer socket 2 Brown
CN10

–16 –
General mechanism
1. Height of neddle bar bushing ........................... 17
2. Height of needle bar......................................... 17
3. Height of presser foot....................................... 17
4. Height of feed dog............................................ 18
5. Feed timing....................................................... 18
6. Needle-to-hook timing ...................................... 18
7. Clearance between needle and hook............... 18
 8. Positionofbobbincasepositioningnger........ 19
9. Stroke of thread take-up spring
(absorbing amount of thread)........................... 19
10.Tension of thread take-up spring ........................ 19
11. Bobbin thread tension ...................................... 20
12. Position of bobbin winder clutch....................... 20
13. Adjustment of bobbin winder............................ 21
14. Position of threader support plate mas. asm.... 22
15. Vertical position of threader hook..................... 22
Automatic thread trimmer mechanism
1. Positioning of moving knife arm installing plate
(adjustment of position of moving knife)........... 23
2. Installing position of thread trimmer solenoid
(moving amount of thread trimmer cam
contactor shaft)................................................. 23
3. Thread trimmer cam timing
(needle-to-cam position)................................... 24
4. Position and protruding amount of looper
(left/right position and adjustment of movement)
......................................................................... 27
5. Position of nut of wire setscrew
(adjustment of thread tension disk open/close)
......................................................................... 27
[5] ADJUSTMENT OF COMPONENTS
(Caution) Convex portion of connectors, CN7, CN8 and CN9 should be placed up.
Connector insertion diagram
Convex portion
(FILTER circuit board)
CR1 CN22
L1
CN21
C2
WHT
BLU
1
1
1
BRN
C1
L2
CN23
ZNR1
F1
〜
〜
－
－

–17 –
General Mechanism
1. Height of needle bar bushing
™Set dimension from top surface of throat plate to
lower end face of needle bar bushing to 67.0 ±
0.1mm.(bushing:drivingt)
2. Height of needle bar
™Lower dead point of needle bar.
™Attach length gauge (needle) of #14 needle to needle bar, and adjust dimension from tip of needle to install-
ing plane of throat plate on frame to 17.8 ± 0.1 mm.
™Perform adjustment with needle bar connection setscrew.
Position of standard
Upper engraved line Aon needle bar aligns with
bottom end of 3needle bar bushing when nee-
dle bar is at lower dead point.
3. Height of presser foot
™Adjust the height in the state that hand lifter lever
is raised.
™Clearance provided between top surface of throat
plate and lower face of presser foot is 7.0±0.5
mm.
™Perform adjustment with presser bar connection
setscrew.
Lower end face of needle bar
bushing
Top surface of throat plate
67.0 ± 0.1 mm
Needle bar
connection
setscrew
2
3
A
Frame
Installing plane of throat plate on frame
17.8 ± 0.1 mm
Throat plate
Presser foot
7.0±0.5 mm