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
1 Arm cover setscrew
SM5042005SN
3 Arm cover
6 Convex of presser
spring regulator knob
5 Slit 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 1 setscrews and
remove belt cover.
™ Remove three 2 setscrews 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 1 setscrews.
™ Disconnect and remove 2
connector.
Assembly
™ Insert 2 connector.
™ Align 6 convex with 5 slit and
tighten the setscrew.
3 Face plate asm.
1 Lamp connector
5 Face cover
2 Face plate asm. setscrew
SL5040631SE
6 Hand lifter lever spring
4 Indicating needle of
presser spring regulator
Point
™ There should be no difference in
level around the cover when face
cover is closed.
™ 5 should not come in contact with
4 indicating needle.
Disassembly
™ Disconnect 1 connector and 6
remove.
™ Remove 2 setscrews and remove
3 face plate asm.
(together with face cover).
Assembly
™ Attach 3 face plate asm., tighten
it with face plate asm. 2
setscrews, and attach 6 hand
lifter lever spring.
™ Insert 1 connector.
2 Motor cover setscrew
SM5041255SN
1 Belt cover setscrew
SM5041255SN
4 MAIN circuit
board case cover
2 Bobbin
winder
connector
– 5 –
5. MAIN circuit board asm.
Preparation
™ Remove arm cover asm.
™ Remove MAIN circuit board case
cover and lamp connector.
Note) 3 Setscrew 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 1 setscrews and
remove bed cover.
Assembly
™ Attach bed cover and tighten
setscrews.
1 Bed cover setscrew
SM5051255SN
1 Bed 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 6 clip bands (3 places).
™ Remove 2 setscrews 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 3 nuts 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 6 clip band.
™ Loosen 4 cord presser.
™ Remove two 1 setscrews and
remove motor asm.
™ Remove two 2 setscrews and
remove transformer asm.
Make sure of wiring route.
Assembly
™ Attach transformer and tighten
3 setscrews.
™ Attach motor asm. and tighten
1 setscrews.
™ Fix it with 4 cord presser.
™ Attach cord guide plate asm. and
tighten 5 and 5-1 setscrew.
™ Connect cord guide plate and
cord.
Function Components
2 Power
transformer
setscrew
SM5040855SN
3 Motor setscrew nut
1 Motor asm.
setscrew
SM5050855SN
5-1
5 Cord guide
plate setscrew
SM5030655SN
4
2 MAIN circuit board case setscrew A
SL5030831SF
3 MAIN circuit board setscrew
4 MAIN circuit board case
setscrew B SM5031401SE
Porality exists.
Never loosen this screw.
6 clip band (3 places)
– 6 –
2. Handwheel and clutch
Preparation
™ Remove belt cover.
™ Remove arm cover.
9 Motor pulley
6 Groove of
handwheel bushing
8 Handwheel bushing stopper pin
4 Angle portion of clutch spring
7 Convex of handwheel bushing
3 Groove of clutch spring support
!0 Groove of handwheel
3. Thread tensioner asm.
Disassembly
™ Remove 1 setscrew.
™ Remove cord guide plate
setscrew and remove cord guide
plate asm.
™ Remove 3 spring support.
™ Move 4 in the direction where
clutch spring is released and
remove clutch spring.
™ Face 6 to motor side and 8 is
hard to drop.
™ Draw out 8 and remove 9.
Assembly
™ Attach 9 and enter 8.
™ Enter 6 groove of bushing to 8
stopper pin and attach bushing.
™ Enter 5 hook portion of spring to
slit in the center of handwheel
bushing
™ Enter 5 clutch spring to 3 groove
of spring support and attach cord
guide plate asm. Then tighten
setscrew.
Point
™ Align 7 convex of bushing with
!0 groove of handwheel and
attach handwheel. Then tighten
setscrew.
™ Clearance provided between
convex of 3 clutch spring support
and clutch plate is 2 ± 0.5 mm.
™ See item 12 on page 19 for
adjustment.
1 Handwheel
setscrew
2 Handwheel
Disassembly
™ Remove 1 setscrew.
™ Lower presser foot and remove 2
setscrew.
™ Remove 3 spring together with
4 thread tensioner asm. and
adjusting plate.
Assembly
™ Attach 6 adjusting plate and 3
spring to thread tensioner asm.
and attach it to frame. Then fix it
with 2 setscrew.
™ Tighten 1 adjusting 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.
1 Thread take-up spring
adjusting plate setscrew
SL5030801SN
2 Thread tensioner setscrew
SM8040602TP
3 Thread take-up spring
4 Thread tensioner asm.
5 Thread tension disk presser
5 Hook portion of clutch spring
6 Thread take-up
spring adjusting
plate
When removing motor
pulley, remove cord guide
plate setscrews 5 and 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 8 lever and loosen 1
setscrew.
™ Drawing 3 upward, remove 4
spring.
™ Remove 5 connection and 6 lever.
™ Remove regulator 2 screw.
™ Do not remove 7 indicating needle.
3 is hard to remove since secrew
mark is attached.
Assembly
™ Attach regulator 2 screw.
™ Set 6 lever to frame, and then
set 5 connection.
™ Attach 4 spring when setting
3 presser bar from upper side.
Point
™ Set 4 spring under 7 indicating
needle.
™ Lower 8 lever and temporarily
tighten it at the position where top
end of 3 protrudes approximately
4 mm from frame.
For the adjustment, see item 3 on
page 17.
™ Needle should not interfere with
presser foot.
Disassembly
™ Remove 3 and 4.
™ Remove 1 felt. (Push up needle
bar upper bushing 1 felt with 5
and draw it out.)
™ Loosen setscrew of 2 and 6.
(Pushing needle bar 5 upward is
acceptable.)
™ Draw out 5 upward.
™ Remove left 6 screw and remove
crank rod.
Assembly
™ Attach crank rod and tighten it with
6.
™ Perform positioning of needle bar
and tighten needle bar connection
2 setscrew.
™ Set needle bar and attach 4 and 3.
™ Insert 1 into 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.
6 Presser bar lifting lever
8 Hand lifter lever
3 Presser bar
2 Presser spring regulator
7 Indicating needle of
presser spring regulator
4 Presser spring
5 Presser bar connection asm.
1 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
1 Needle bar upper bushing felt
2 Needle bar connection setscrew
SM8060510SP
6 Needle bar threader guide setscrew
5 Needle bar
3 Needle bar thread bracket
setscrew A1420-001-000
4 Needle clamp
– 8 –
7. Reverse feed stitch lever
Preparation
™ Remove belt cover.
8. Idler
Preparation
™ Remove belt cover.
Disassembly
™ Remove 1 setscrew and remove
idler asm.
Assembly
™ Assemble idler and tighten it with
1 setscrew.
™ 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 1 spring from arm.
™ Remove two 2 setscrews.
™ Remove 4 lever arm from the slot
of 5 regulator when removing 3.
Assembly
™ Attach 3 lever and set with 2
setscrews.
™ Hook lever spring 1 to lever arm
4.
Point
™ Set 4 lever arm to the slot of 5
regulator.
Disassembly
™ Loosen 1 setscrew.
™ Loosen two 2 setscrews.
™ Draw out thread 3 take-up
supporting shaft.
™ Remove 5 and 6 together with
4 needle bar crank.
Assembly
™ Set needle bar crank to thread
take-up, attach it onto main unit
and tighten setscrews (2 pcs.).
™ Set 6 to 5, enter thread take-up
supporting shaft 3 to 6, attach it
onto frame and tighten 1
setscrew.
Point
™ Tighten setting portion (flat
portion) of needle bar crank with
screw No. 1.
™ Press 3 shaft 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.
2 Convex portion of idler installing plate
1 Idler setscrew
SM5040855SN
5 Feed regulator
1 Reverse feed
stitch lever spring
4 Reverse feed
stitch lever arm
2 Needle bar
crank setscrew
5 Thread take-up
1 Thread take-up supporting shaft setscrew
SM8050602TP
3 Thread take-up
supporting shaft
4 Needle bar crank
6 Thread take-up
support
3 Reverse feed stitch
lever mas. asm.
2 Reverse feed stitch lever
setscrew SM5040855SN
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