JUKI TL-98Q User manual

R
SERVICE MANUAL
TL-98Q/98QE
1-NEEDLE LOCKSTITCH SEWING MACHINE WITH
AUTOMATIC THREAD TRIMMER FOR PROFESSIONAL

CONTENTS
[1] SPECIFICATIONS OF TL-98Q/98QE ............................................................. 1
[2] NAMES OF COMPONENTS ........................................................................... 3
[3] DISASSEMBLY AND ASSEMBLY ................................................................. 3
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT)............. 17
[5] ADJUSTMENTS OF COMPONENTS ........................................................... 18
WARNING :
To avoid the risk of fire, 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-98Q/98QE
(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 (2 m cord) 50 to 1,500 rpm
Low speed rotation of 50 rpm 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 (TL-98Q) / 12 mm (TL-98QE)
By knee lifter : 12 mm
10. Thread tension : Disk pressure adjusting type with simplified 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
(TL-98Q) 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
(TL-98Q) 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 50 rpm 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 (TL-98Q)
10.5kg (TL-98QE)
(9) Power consumption
Whole sewing machine : 120V 1.4A 60Hz
Lamp : 12V 3W (Halogen lamp)

–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 ......................... 12
14. Hand lifter lever ..................................... 13
15. Drop-feed knob ..................................... 14
TL-98Q
Automatic thread trimming components
1. Looper mas. asm. ................................. 15
2. Moving knife arm
installing plate mas. asm. ..................... 15
3. Moving knife base mas. asm. ................. 16
4. Thread trimming solenoid mas. asm. ..... 16
Indicating needle of
presser spring regulator
Face cover
Pressure indicating plate
Thread take-up thread guide
Lamp switch
Thread take-up spring
Presser bar connection thread guide
Lamp bulb
Hand lifter lever
Needle bar thread guide
Needle bar thread bracket
Presser spring regulator
(Hole for auxiliary table support plate)
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
Needle up/down switch
Automatic thread trimming switch
Reverse feed stitch lever
Hole for knee lifter lever setting
Bed cover rubber seat
Bed cover
Drop-feed knob
(Hole for auxiliary table support plate)
Thread guide rod
Needle threader 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
Point
™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
™Remove four 1setscrews and
remove belt cover.
™Remove three 2setscrews and
remove motor cover.
Assembly
™Attach belt cover and tighten 1
setscrews.
™Attach motor cover and tighten 2
setscrews.
Point
™There should be no torsion or
distorsion in presser spring
regulator.
™Align precisely slit portion with
convex portion.
™Do not press each lead wire.
Disassembly
™Remove two 1setscrews.
™Disconnect and remove 2
connector.
Assembly
™Insert 2connector.
™Align 6convex with 5slit and
tighten the setscrew.
3Face plate asm.
1Lamp connector
5Face cover
2Face plate asm. setscrew
SL5040631SE 6Hand lifter lever spring
4Indicating needle of
presser spring regulator
Point
™There should be no difference in
level around the cover when face
cover is closed.
™5should not come in contact with
4indicating needle.
Disassembly
™Disconnect 1connector and 6
remove.
™Remove 2setscrews and remove
3face plate asm.
(together with face cover).
Assembly
™Attach 3face plate asm., tighten
it with face plate asm. 2
setscrews, and attach 6hand
lifter lever spring.
™Insert 1connector.
2Motor cover setscrew
SM5041255SN
1Belt cover setscrew
SM5041255SN
4MAIN circuit
board case cover
2Bobbin
winder
connector

–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.
PointDisassembly
™Remove six 1setscrews and
remove bed cover.
Assembly
™Attach bed cover and tighten
setscrews.
1Bed cover setscrew
SM5051255SN
1Bed cover setscrew
Point
™Read the note and understand it.
™Ther are color indications on the
circuit board for inserting
connectors.
Disassembly
™Remove 7 connectors of each
lead wire.
™Cut 6clip bands (3 places).
™Remove 2setscrews and 4
setscrew, and remove circuit board.
Assembly
™Press play of circuit board to
attach circuit board to the front
side and tighten two setscrews.
™Insert each lead wire into
connectors.
Point
™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.
Disassembly
™Remove cord guide plate 5
setscrews 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.
Assembly
™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.
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)

–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
setscrew and remove cord guide
plate asm.
™Remove 3spring support.
™Move 4in the direction where
clutch spring is released and
remove 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 3groove
of spring support and attach cord
guide plate asm. Then tighten
setscrew.
Point
™Align 7convex of bushing with
!0 groove of handwheel and
attach handwheel. Then tighten
setscrew.
™Clearance provided between
convex of 3clutch spring support
and clutch plate is 2 ±0.5 mm.
™See item 12 on page 19 for
adjustment.
1Handwheel
setscrew
2Handwheel
Disassembly
™Remove 1setscrew.
™Lower presser foot and remove 2
setscrew.
™Remove 3spring together with
4thread tensioner asm. and
adjusting plate.
Assembly
™Attach 6adjusting plate and 3
spring to thread tensioner asm.
and attach it to frame. Then fix it
with 2setscrew.
™Tighten 1adjusting plate
setscrew.
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 1
setscrew.
™Drawing 3upward, remove 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 on 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 removing 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
supporting 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 1
setscrew.
Point
™Tighten setting portion (flat
portion) 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 (TL-98Q)
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
remove 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
regulating 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
remove 6.
™Remove 1setscrew and take out
lever spring.
™Lower 2and turn it to the position
where 3can be removed.
™Remove 3, remove claw lever
actuating plate, and draw out 2.
™Remove claw lever shaft 7
setscrew.
™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
lever shaft.
Disassembly
™Remove 1nut (left side only).
™Remove 2setscrew and remove
tube presser.
™Remove 3setscrews and
remove wire holder mas. asm.
™Remove setscrew in thread
release 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
connecting 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 other.
™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
TL-98Q

–11 –
Preparation
™Remove outer components.
(Excluding belt cover and motor cover)
™Raise presser foot.
Disassembly
™Remove snap 4pin.
™Remove 5setscrews and
remove 6.
™Exclude screw 1and take off a
lever axis spring and take off knee
advance lever axis fixation E ring
!1.
™Lower 2and turn it to the position
where 3can be removed.
™Remove 3, remove claw lever
actuating plate, and draw out 2.
™Remove claw lever shaft 7
setscrew.
™Remove 8link asm..
Assembly
™Attach 8to frame and tighten 7
setscrews.
™Put knee advance lever axis
washer !2 and set lever axis 2
and wave washer !3 and nail lever
operation board 9and set by 3.
™Fix lever axis 2by E ring !1.
™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
lever shaft.
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
!1 Knee advance lever
axis fixation E ring
!2 Knee advance lever axis washer
!3 Wave washer
TL-98QE

–12 –
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 flaw 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 2
setscrew B.
™Turn 4shaft slit to adjust
backlash in pulley and tighten 2
setscrew 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
reverse 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.

–13 –
14. Hand lifter lever
Disassembly
™Enter 3 to 4 screw threads of M4
screw (arm cover setscrew) in the
hole of hand lifter lever shaft on
frame.
™Hold screw head and draw out the
screw. At the same time, 2 hand
lifter lever shaft is drawn out.
™Remove 1hand lifter lever.
Assembly
™Enter 2hand lifter lever shaft into
the hole on frame.
™Tap head of lever shaft to fit the
shaft by force and set the shaft to
hole in hand lifter lever.
Point
™End face of lever shaft that is fit
by force should not be convex
from frame face.
1Hand lifter lever
2Hand lifter lever shaft
3M4 screw
Disassembly
™Loosen presser foot lift lever shaft
stopper screw 4.
™Enter 3 to 4 screw threads of M4
screw (arm cover setscrew) in the
hole of hand lifter lever shaft on
frame.
™Hold screw head and pull it and
remove.
™Pull up presser foot lift lever axle
at a time.
™Remove 1hand lifter lever.
Assembly
™Enter 2hand lifter lever shaft into
the hole on frame.
™Ajust presser foot lever shaft set
screw 4so that the tip of screw
4may hit at flat spot of presser
foot lever shuft 2.
Point
™End face of presser foot lever
shaft ais not to project from
frame side.
1Hand lifter lever
2Hand lifter lever shaft
3M4 screw
4Presser foot lift lever shaft
stopper screw
TL-98Q
TL-98QE
Flat spot
a

–14 –
15. Drop-feed knob
Disassembly
™Set 1drop-feed knob to "NOT
FEED", remove 4drop feed knob
shaft setscrew, and remove 3E-
ring of drop feed knob.
™Remove 2DF adjusting arm
spring while removing 6DF
adjusting 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
4 Drop feed knob shaft setscrew

–15 –
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 remove
installing plate mas. asm.
At this time, simultaneously remove
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
adjustment 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
remove 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 item 4-2 on page 27 for
adjustment of looper moving
amount.
7Bobbin case
(Center of inner hook)
6Looper
2Looper
mas.asm
8Thread trimmer clutch
plate collar
7Thread trimmer clutch plate
collar setscrew
TL-98Q

–16 –
Disassembly
™Remove washer, E-ring, eccentric
shaft and setscrews of 1thread
trimmer solenoid link A.
™Remove 1thread trimmer
solenoid 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.
Assembly
™Attach thread trimmer solenoid
and temporarily tighten it with 3
setscrews.
™Adjust clearance between pin at
top end of thread trimmer auxiliary
link and thread trimmer auxiliary
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
setscrews.
* Solenoid has to properly work when
the solenoid performs suction.
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
securely tighten it.
™Tilt frame, set moving knife link
shaft A and enter 1E-ring.
Point
™When assembling, it is better to
raise by finger 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

–17 –
Description MAIN circuit board Cord
Terminal Pin color
Motor CN7 1 Blue
3 Brown
5 Black
Power connecting CN9 1 Blue
wire 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
(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.
Description MAIN circuit board Cord
Terminal Pin color
Controller socket CN5 1 Yellow
2 White
Thread trimmer CN4 1 Blue
solenoid (TL-98Q) 2 Blue
CN1
CN2
CN4
CN3
CN5
CN6
CN7
CN8
[4] PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT)
Description FILTER circuit board Cord
Terminal Pin color
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 Cord
Terminal Pin color
External thread CN11 1 Black
trimmer socket 2 Brown
2
(AC 22V),
(AC19.8V)
Controller
Thread trimmer
socket
(TL-98Q)
External thread
trimmer SW
(TL-98Q)
Controller
socket
Bobbin winder SW
Thread trimmer
solenoid
(TL-98Q) 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(TL-98Q)
AC120V (TL-98Q)
Plug socket
(MAIN circuit board)
CN9
Thread trimmer SW circuit board

–18 –
General mechanism
1. Height of needle bar bushing ........................... 19
2. Height of needle bar......................................... 19
3. Height of presser foot....................................... 19
4. Height of feed dog ............................................ 20
5. Feed timing ...................................................... 20
6. Needle-to-hook timing ...................................... 20
7. Clearance between needle and hook .............. 20
8. Position of bobbin case positioning finger ........ 21
9. Momentum of thread take-up spring
(absorbing amount of thread)........................... 21
10. Tension of thread take-up spring ..................... 21
11. Bobbin thread tension ...................................... 22
12. Position of bobbin winder clutch ...................... 22
13. Adjustment of bobbin winder ............................ 23
14. Position of threader support plate mas. asm.
(TL-98Q) .......................................................... 24
15. Vertical position of threader hook (TL-98Q) ..... 24
TL-98Q
Automatic thread trimmer mechanism
1. Positioning of moving knife arm installing plate
(adjustment of position of moving knife) .......... 25
2. Installing position of thread trimmer solenoid
(moving amount of thread trimmer cam
contactor shaft) ................................................ 25
3. Thread trimmer cam timing
(needle-to-cam position) .................................. 26
4. Position and protruding amount of looper
(left/right position and adjustment of movement)
......................................................................... 29
5. Position of nut of wire setscrew
(adjustment of thread tension disk open/close)
......................................................................... 29
[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
〜
〜
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