JUKI TL Series User manual

SERVICE MANUAL
TL series
1-NEEDLE LOCKSTITCH SEWING MACHINE WITH
AUTOMATIC THREAD TRIMMER FOR PROFESSIONAL
No.00
40175681

CONTENTS
[1] SPECIFICATIONS ........................................................................................... 1
[2] NAMES OF COMPONENTS ........................................................................... 3
[3] DISASSEMBLY AND ASSEMBLY .................................................................. 3
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT) ............. 16
[5] ADJUSTMENTS OF COMPONENTS ........................................................... 17
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
(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 80 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 : LED 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 : 12 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 1.1A 60Hz
: 230V 98W 50Hz/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 ............................................ 10
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
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
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
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
❶ Arm cover setscrew
SM5042005SN
❸ Arm cover
❻ Convex of presser spring
regulator knob ❺ Slit of presser regulating screw
❸ Face plate asm.
❶ Lamp connector
❺ Face cover
❷ Face plate asm. setscrew
SL5040631SE ❻ Hand lifter lever spring
❹ Indicating needle of
presser spring regulator
❷ Motor cover setscrew
SM5041255SN
❶ Belt cover setscrew
SM5041255SN
❹ MAIN circuit
board case cover
Disassembly Assembly Point
○Remove two ❶setscrews.
○Disconnect and remove ❷con-
nector.
○Insert
❷connector.
○Align
❻convex with ❺slit and
tighten the setscrew.
○There should be no torsion or dis-
torsion in presser spring regulator.
○Align precisely slit portion with con-
vex portion.
○Do not press each lead wire.
Disassembly Assembly Point
○Remove four ❶setscrews and
remove belt cover.
○Remove three ❷setscrews and
remove motor cover.
○Attach belt cover and tighten ❶
setscrews.
○Attach motor cover and tighten
❷setscrews.
○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 ❶connector and ❻
remove.
○Remove ❷setscrews and re-
move ❸face plate asm.
(together with face cover).
○Attach
❸face plate asm., tighten
it with face plate asm. ❷set-
screws, and attach ❻hand lifter
lever spring.
○Insert
❶connector.
○There should be no difference in
level around the cover when face
cover is closed.
○❺should not come in contact
with ❹indicating needle.
❷ Bobbin
winder
connector

–5 –
5. MAIN circuit board asm.
Preparation
○Remove arm cover asm.
○Remove MAIN circuit board case
cover and lamp connector.
Note)
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.
❶ Bed cover setscrew
SM5051255SN
❶ Bed cover setscrew
Function Components
❷ Power
transformer
setscrew
SM5040855SN
❸ Motor setscrew nut
❶ Motor asm.
setscrew
SM5050855SN
❺ Cord guide
plate setscrew
SM5030655SN
❷ MAIN circuit board case setscrew A
SL5030831SF
❸ MAIN circuit board setscrew
❹ MAIN circuit board case
setscrew B SM5031401SE
Porality exists.
Never loosen this screw.
❻ clip band (3 places)
Disassembly Assembly Point
○ Remove six ❶setscrews and re-
move bed cover.
○ Attach bed cover and tighten set-
screws.
Disassembly Assembly Point
○Remove 7 connectors of each
lead wire.
○Cut
❻clip bands (3 places).
○Remove
❷setscrews and ❹set-
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.
○There are color indications on
the circuit board for inserting
connectors.
Disassembly Assembly Point
○ Remove cord guide plate ❺set-
screws and ❺-1 in previous item,
and cut ❻clip band.
○ Loosen ❹cord presser.
○ Remove two ❶setscrews, E-ring,
and MP shield plate. Then remove
motor asm.
○ Remove two ❷setscrews and re-
move transformer asm.
Make sure of wiring route.
○ Attach transformer and tighten ❸
setscrews.
○ Attach motor asm. and MP shield
plate, and fix it with E-ring. Then
tighten it with ❶setscrews.
○ Fix it with ❹cord presser.
○ Attach cord guide plate asm. and
tighten ❺and ❺-1 setscrew.
○ Connect cord guide plate and cord.
○ Loosen ❸nuts to adjust mo-
tor tension.
○ Belt tension : the belt should
sag 3 to 4 mm when center
of belt is applied with 1.96N
load.
❺-1
❹
E-ring
MP shield plate
❸ Setscrew to set the
circuit board and cover to
circuit board case
Do not insert in the reverse
direction. (See page 16.)
Do not loosen this screw.

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

–7 –
4. Presser bar
Preparation
○Remove arm cover asm.
○Remove face plate mas. asm.
○Remove presser foot and setscrew.
❻ Presser bar lifting lever
❽ Hand lifter lever
❸ Presser bar
❷ Presser spring regulator
❼ Indicating needle of
presser spring regulator
❹ Presser spring
❺ Presser bar connection asm.
❶ Presser 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
❶ Needle bar upper bushing felt
❷ Needle bar connection setscrew
SM8060510SP
❻ Needle bar threader guide setscrew
❺ Needle bar
❹ Needle clamp
❸ Needle bar thread bracket setscrew
A1420-001-000
Disassembly Assembly Point
○ Lower ❽lever and loosen ❶set-
screw.
○ Drawing ❸upward, remove ❹
spring.
○ Remove ❺connection and ❻lever.
○ Remove regulator ❷screw.
○ Do not remove ❼indicating needle.
❸is hard to remove since secrew
mark is attached.
○Attach regulator ❷screw.
○Set ❻lever to frame, and
then set ❺connection.
○Attach
❹spring when setting
❸presser bar from upper
side.
○Set
❹spring under ❼indicating
needle.
○Lower ❽lever and temporarily
tighten it at the position where top
end of ❸protrudes approximately
4 mm from frame.
For the adjustment, see item 3 on
page 18.
○Needle should not interfere with
presser foot.
Disassembly Assembly Point
○Remove
❸and ❹.
○Remove ❶felt. (Push up
needle bar upper bushing ❶
felt with ❺and draw it out.)
○Loosen setscrew of ❷and
❻. (Pushing needle bar ❺
upward is acceptable.)
○Draw out ❺upward.
○Remove left ❻screw and re-
move crank rod.
○Attach crank rod and tighten it with
❻.
○Perform positioning of needle bar
and tighten needle bar connection
❷setscrew.
○Set needle bar and attach ❹and ❸.
○Insert
❶into hole.
○Temporarily tighten ❻, and perform
adjustment of vertical height after at-
taching threader support plate asm.
○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 18 for the ad-
justment.
○See item 15 on page 23 for height
adjustment of threader hook of
threader support plate mas. asm.

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

–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.
❶ Thread trimming switch
circuit board case setscrew
SL4040655SN
❸ Feed regulating screw
stopper asm. setscrew
❺ Feed regulating screw
• Stopper screw
• Stopper nut
❷ Feed regulating
pin
❶ Stitch dial setscrew
SM8030402TP
❹ Feed regulating screw
Disassembly Assembly Point
○Loosen two ❶setscrews and re-
move the dial.
○Be careful since ❷pin jumps.
○❸may not be removed.
(Stopper screw SM8031400TP)
○Turn regulating ❹screw full to
the right.
○Assemble stitch dial with its scale
0 up and tighten ❶screw (2
pcs.).
○There should be no play in feed
regulator when operating lever.
(When scale is 0.)
○Loosen ❺stopper nut. Make
stopper screw strike against reg-
ulating ❹screw and tighten nut.
Disassembly Assembly Point
○ Remove two ❶setscrews in
thread trimming switch case.
○ Remove thread trimming switch
case.
○Attach the switch case to frame
and tighten with ❶setscrews.
○There should not be no torsion
between switch and frame.

–10 –
12. Knee lifter lever
Preparation
○ Remove outer components.
(Excluding belt cover and motor cover)
○ Raise presser foot.
❷ Knee lifter lever shaft ❽ Knee lifter link asm
(claw lever plate)
❼ Claw lever shaft
setscrew
SM5041255SN
❸ Claw lever actuating plate
setscrew SM8040602TP
❻ Knee lifter lever
❺ Knee lifter lever shaft
stop plate setscrew
SM5040855SN
❹ Knee lifter link snap pin
❶ Knee lifter lever shaft spring setscrew
SM5030455SF
󱢳 Knee lifter
lever shaft
❾ Claw lever
actuating
plate
Disassembly Assembly Point
○Remove
❶nut (left side only).
○Remove ❷setscrew and remove
tube presser.
○Remove ❸setscrews and remove
wire holder mas. asm.
○Remove setscrew in thread release
❻plate shaft and remove thread re-
lease ❹plate.
When removing the wire from frame,
make sure of wire route in frame.
○Lay wire in frame.
○Connect thread release ❹
plate with disk pressure re-
lease connecting ❺link.
○Assemble wire holder mas.
asm. and tighten with ❸set-
screws.
○Fix ❷and ❶in the reverse
side of machine bed.
○Pass the wire through full re-
verse side of stitch dial.
○Contact
❹and ❺with each oth-
er.
○For
❷, tube has to come out by
13 mm from tube presser.
○Tube presser and tube regarding
❷should be on the same face.
See item 5 on page 28 for ❶.
Disassembly Assembly Point
○Remove snap ❹pin.
○Remove
❺setscrews and remove ❻.
○Remove
❶setscrew and take out le-
ver spring.
○Lower ❷and turn it to the position
where ❸can be removed.
○Remove
❸, remove claw lever actu-
ating plate, and draw out ❷.
○Remove claw lever shaft ❼setscrew.
○Remove
❽link asm..
○Attach
❽to frame and tighten ❼set-
screws.
○Set
❷lever shaft, attach ❾claw lever
actuating plate and tighten it with ❸.
○Attach lever spring and tighten with ❶.
○Raise frame, attach ❻knee lifter lever
to knee lifter lever 󱢳shaft, and tight-
en it with ❺.
○Enter
❹snap pin.
○There should not be
a play in the axial di-
rection of ❷knee lifter
lever shaft.
11. Wire holder
Preparation
○ Remove outer components.
(Excluding belt cover and
motor cover)
○ Remove presser bar.
❶ Nut of setscrew
(opposite side 9 mm)
NS6620310SP
❷ Wire tube presser setscrew
SM4040655SN
❸ Wire holder setscrew
SM5040855SN
❺ Disk pressure release
connecting link
❹ Thread release plate ❻ Thread release plate shaft

–11 –
13. Hook driving shaft pulley
Preparation
○Remove outer components.
(Excluding stop solenoid)
○Loosen idler.
○Remove needle.
❽ E-ring groove
❻
❹
❺
󱢳 Moving knife roller arm
󱢴 Thread trimmer cam
❷ Hook driving shaft pulley eccentric shaft setscrew
SM8040602TP
Hexagon 2.0 mm
❺ Hook driving shaft pulley eccentric shaft
❾ Thread trimmer cam screw No. 1
❸ Hook driving shaft pulley E-ring (E-6)
❻ Hook driving shaft pulley
eccentric shaft bushing
Slit on ❹ hook driving shaft pulley
eccentric shaft
❶ Timing belt
(Illustration of hook driving shaft pulley)
AB
Make ❼ hook driving shaft pulley
come out downward.
Disassembly Assembly Point
○ Remove timing belt from main
shaft pulley.
○ Remove ❶belt and loosen two
❷setscrews.
○ Remove ❸E-ring and turn ❹to
find a place where backlash in
hook driving shaft pulley is large.
○ Press ❺and push out ❻bush-
ing to the right side.
○ Draw out ❺and ❻, and remove
❼following the point of ❼.
Do not make a aw on ❽E-ring
groove when removing ❸E-ring.
○ Enter hook driving shaft ❼
pulley.
○ Enter eccentric ❺shaft and
❻.
○ Set ❸E-ring.
○ Remove the play in hook driv-
ing shaft with ❻and tighten
❷setscrew B.
○ Turn ❹shaft slit to adjust
backlash in pulley and tighten
❷setscrew A.
○ Set ❶belt.
Adjust backlash in eccentric
shaft by right rotation.
When setting ❻bushing, 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 ❾
screw No. 1 to this side (just front).
○ Enter contact of 󱢳roller arm to
groove of 󱢴cam.
○ Turn hook driving shaft in the re-
verse direction and set belt at the
position where it stops.

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

–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 ❷looper mas. asm..
○Remove moving knife arm ❻spring.
❸ Nut (9 mm) of
wire setscrew
❶ Moving knife link shaft A
E-ring E-4
❺ Moving knife link
❹ Moving knife arm installing plate
mas. asm. set screw SM4050855SP
❻ Moving knife arm spring
❺ Looper mas. asm.
setscrew
SM5040855SN ❸ Looper link asm.
❷ Looper link holding shaft
(Washer A1731090000
E-ring E-3)
❹ Moving knife
arm spring
❶ Looper link B
E-ring E-3
❼ Bobbin case
(Center of inner hook)
❻ Looper
❷ Looper
mas.asm
❽ Thread trimmer clutch
plate collar
❼ Thread trimmer clutch plate
collar setscrew
Disassembly Assembly Point
○Remove
❶E-ring.
○Remove E-ring and washer of ❷.
○Remove looper link asm of ❸.
○Remove moving knife arm spring
of ❹.
○Remove setscrews of ❺and re-
move looper mas. asm.
○Attach looper mas. asm. and
tighten ❺setscrews. (Adjust
looper link B shaft to hole.)
○Hook moving knife arm ❹spring.
○Set looper link and attach E-ring,
washer, etc.
○Place ❻looper in the center
❼of inner hook and securely
tighten ❺.
See item 4-2 on page 28 for
adjustment of looper moving
amount.
Disassembly Assembly Point
○Remove
❶E-ring.
Do not remove ❺moving knife link.
(Remove together with moving knife
arm installing plate.)
○Remove
❸nut on the left side only.
○Remove thread trimmer clutch plate
❼collar setscrew and ❽thread
trimmer clutch plate collar.
○Remove two ❹screws and remove
installing plate mas. asm.
At this time, simultaneously remove
moving knife link.
(To prevent moving knife link from
warping)
○Attach moving knife arm installing
plate mas. asm.
Note : See the point on the right side.
○Temporarily tighten ❹setscrews.
○Attach
❶E-ring of link shaft.
○Temporarily tighten ❷looper mas.
asm..
○Attach
❻moving knife arm spring.
○Determine position of moving knife
and securely tighten ❹.
Note : Refer to assembling of moving
knife and looper mas. asm.
○Set
❶moving knife link and
wire ❸setscrew.
○Position of moving knife
Remove hook and see from
the reverse side of bed.
(See item 1 on page 24.)
○See item 5 on page 28 for
adjustment of ❸nut of wire.

–14 –
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.
❸ Thread trimmer solenoid
mas. asm. setscrew
SM5040655SN
❺ Moving knife
roller arm ❹ Moving knife arm
❶ Thread trimmer
solenoid link A
Washer and E-ring
3. Moving knife base mas. asm.
Preparation
○Remove bed cover.
○Remove throat plate asm.
❶ Moving knife link
shaft A E-ring
❷ Moving knife
base mas. asm.
setscrew
SM4040855SP
❸ Feed dog
Eccentric shaft setscrew
Disassembly Assembly Point
○Remove washer, E-ring, eccen-
tric shaft and setscrews of ❶
thread trimmer solenoid link A.
○Remove
❶thread 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
auxiliary cam.
○Attach thread trimmer solenoid
and temporarily tighten it with ❸
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 ❸setscrews.
○Fix ❶thread trimmer solenoid
link A with eccentric shaft, wash-
er and E-ring.
(See item 2 on page 23 and item
3-5 on page 24 for the adjustment.)
○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.
Disassembly Assembly Point
○Remove
❶E-ring and raise
frame.
○Remove two ❷setscrews.
○Bring ❸feed dog to its highest
position.
○Raising moving knife base by
hand, lightly press moving knife
link A from upper side.
(Release coupling.)
○Attach moving knife base to
frame while setting moving knife
base to moving knife link shaft A.
○Temporarily tighten ❷setscrews.
○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 ❶E-ring.
○When assembling, it is better to
raise by nger moving knife link
A from below.

–15 –
[Adjusting the counter knife]
1) Properly installing the knife thread guide
Install the knife thread guide ❶so that the needle enters exactly the center of its opening.
2) Properly installing the counter knife
1. The standard distance from the blade point of the counter knife ❷to the knife thread guide ❶, which is posi-
tioned so that the needle enters the center of its opening, is 0.5 mm.
2. The blade point of the counter knife ❷is about 4 mm away from the center of the needle.
3. The sharpness of the counter knife ❷depends upon the installing angle of the blade point of the counter
knife ❷. The proper overlap of the counter knife ❷blade with that of the moving knife ❸will provide the best
sharpness.
4. Whenever the counter knife ❷has been readjusted or replaced, be sure to check the sharpness of the count-
er knife ❷, and adjust the installing angle of the counter knife ❷.
Short
Center of
needle
❷
❸
❶
Long
Length of thread remaining on needle
0.5 mm
Center
❷
❸

–16 –
(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.
4. TL-2000Qi (for North America) isn't equipped with VR for speed limiting.
CN1
CN2
CN4
CN3
CN5
CN6
CN7
CN8
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT)
2
(AC 22V),
(AC19.8V)
Controller Controller
socket
Bobbin winder SW
Thread trimmer
solenoid
FILTER
circuit board
Power SW
Motor
MP detection
circuit board
MAIN
circuit board
LED Lamp
CN11 Thread trimmer
SW circuit board
3
3
2
33
22
2
4
CN5
CN3
CN7
CN1
CN6
CN2
CN8
CN4
CN9
2
Transformer
CN22
2
CN21
CN23
AC120V
AC120V or AC220V-240V
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
LED lamp CN2 1 Red
2 Black
Bobbin winder SW CN1 1 Purple
2 Black
3 Gray
MP detection circuit CN6 1 Red
board 2 White
3 Black
Thread trimmer SW CN3 1 Orange
circuit board 2 Black
3 Yellow
Description MAIN circuit board Cord color
Terminal Pin
Controller socket CN5 1 Yellow
2 White
Thread trimmer solenoid CN4 1 Blue
2 Blue
VR for speed limiting CN10 1 Red
2 Yellow
3 Black
Description FILTER circuit board Cord color
Terminal Pin
Transformer Primary side CN21 1 White
(AC 120V or AC220V-240V) 3 Blue
Power connecting wire CN22 1 Brown
3 Blue
Power input CN23 1 Blue
(AC 120V or AC220V-240V) 3 Yellow
CN10 F2 (250V/0.5A)
F1 (250V/1A)

–17 –
General mechanism
1. Height of neddle bar bushing ........................... 18
2. Height of needle bar......................................... 18
3. Height of presser foot....................................... 18
4. Height of feed dog............................................ 19
5. Feed timing....................................................... 19
6. Needle-to-hook timing ...................................... 19
7. Clearance between needle and hook............... 19
8. Position of bobbin case positioning nger........ 20
9. Stroke of thread take-up spring
(absorbing amount of thread)........................... 20
10.Tension of thread take-up spring ........................ 20
11. Bobbin thread tension ...................................... 21
12. Position of bobbin winder clutch....................... 21
13. Adjustment of bobbin winder............................ 22
14. Position of threader support plate mas. asm.... 23
15. Vertical position of threader hook ..................... 23
Automatic thread trimmer mechanism
1. Positioning of moving knife arm installing plate
(adjustment of position of moving knife)........... 24
2. Installing position of thread trimmer solenoid
(moving amount of thread trimmer cam
contactor shaft)................................................. 24
3. Thread trimmer cam timing
(needle-to-cam position)................................... 25
4. Position and protruding amount of looper
(left/right position and adjustment of movement)
......................................................................... 28
5. Position of nut of wire setscrew
(adjustment of thread tension disk open/close)
......................................................................... 28
[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
〜
〜
－
－
AC 120V: 5A/125V AC 220-240V: 3.15A/250V
( )

–18 –
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 ❷needle bar aligns
with bottom end of ❸needle bar bushing when
needle 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
❷
❸
A
Frame
Installing plane of throat plate on frame
17.8 ± 0.1 mm
Throat plate
Presser foot
7.0±0.5 mm