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JUKI TL-98Q Service Manual

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

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JUKI TL-98Q Specifications

General IconGeneral
Thread TensionAdjustable
Knee LifterYes
TypeStraight Stitch Sewing Machine
Stitch Speed1, 500 stitches per minute
Stitch LengthMax. 6mm
Feed Dog SystemDrop Feed
Weight25 lbs
LightingLED light

Summary

SPECIFICATIONS OF TL-98Q/98QE

(1) Power switch

Details the ON-OFF 2-step changeover switch for the sewing machine's power and lamp.

(2) Drive control components

Covers the drive method and control components, including foot pedal controller operation and speed.

(3) Table, stand and handle components

Specifies components related to the portable unit, auxiliary table, and optional stand.

(4) Arm and bed components

Describes the material and form of the sewing machine's arm and bed.

(5) General mechanism

Lists and briefly describes various general mechanisms of the sewing machine, from threading to tension.

(6) Feed mechanism

Details the feed amount adjustment and reverse feed stitch mechanism for stitch control.

(7) Special mechanism

Explains special mechanisms like automatic thread trimming, needle bar stop, and motor protection.

(8) Dimensions and weight

Provides the physical dimensions and weight specifications for the main unit.

(9) Power consumption

Lists the power consumption details for the whole sewing machine and its lamp.

Names of Components

Outer Components

Lists external parts of the sewing machine that can be disassembled or assembled.

Function components

Details internal functional components that are part of the disassembly/assembly process.

TL-98Q Automatic thread trimming components

Lists specific components related to the automatic thread trimming function for the TL-98Q model.

Disassembly/assembly

1. Arm cover asm.

Details the disassembly and assembly procedure for the arm cover.

2. Belt cover and motor cover

Provides steps for removing and reattaching the belt cover and motor cover.

3. Face plate asm.

Explains the process for disassembling and assembling the face plate.

4. Bed cover mas. asm.

Instructions for disassembling and assembling the bed cover assembly.

5. MAIN circuit board asm.

Steps for removing and reinstalling the main circuit board assembly.

1. Motor asm. and transformer asm.

Procedure for disassembling and reassembling the motor and transformer assemblies.

2. Handwheel and clutch

Details the disassembly and assembly of the handwheel and clutch mechanism.

3. Thread tensioner asm.

Instructions for disassembling and reassembling the thread tensioner assembly.

4. Presser bar

Procedure for disassembling and assembling the presser bar.

5. Needle bar

Steps for removing and reinstalling the needle bar and its related components.

6. Thread take-up

Instructions for disassembling and assembling the thread take-up mechanism.

7. Reverse feed stitch lever

Details the process for removing and reattaching the reverse feed stitch lever.

8. Idler

Procedure for disassembling and assembling the idler mechanism.

9. Stitch dial

Steps for removing and reinstalling the stitch dial and its related parts.

10. Thread trimming switch case

Instructions for disassembling and assembling the thread trimming switch case.

11. Wire holder (TL-98Q)

Procedure for disassembling and assembling the wire holder for the TL-98Q model.

12. Knee lifter lever

Details the disassembly and assembly of the knee lifter lever mechanism.

TL-98QE Knee lifter lever

Procedure for disassembling and assembling the knee lifter lever for the TL-98QE model.

13. Hook driving shaft pulley

Details the disassembly and assembly of the hook driving shaft pulley.

TL-98Q Hand lifter lever

Steps for disassembling and assembling the hand lifter lever for the TL-98Q model.

TL-98QE Hand lifter lever

Procedure for disassembling and assembling the hand lifter lever for the TL-98QE model.

15. Drop-feed knob

Instructions for disassembling and assembling the drop-feed knob.

TL-98Q Automatic Thread Trimmer Mechanism

1. Positioning of moving knife arm installing plate (Adjustment of position of moving knife)

Explains how to adjust the position of the moving knife by setting the installing plate.

2. Installing position of thread trimmer SOL (solenoid)

Procedure for adjusting the installing position of the thread trimmer solenoid.

3. Thread trimmer cam timing (Needle-to-cam position)

Details the adjustment of thread trimmer cam timing relative to the needle.

4. Position and protruding amount of looper (Left/right position and moving amount)

Adjusts the looper's left/right position and its moving amount.

5. Position of nut of wire setscrew (Adjustment of thread tension disk open/close)

Adjusts the thread tension disk open/close via the wire setscrew nut.

PRINTED CIRCUIT BOARD DIAGRAM (CONNECTOR LAYOUT)

ADJUSTMENT OF COMPONENTS

1. Height of needle bar bushing

Details the adjustment for the height of the needle bar bushing.

2. Height of needle bar

Explains how to adjust the height of the needle bar.

3. Height of presser foot

Procedure for adjusting the height of the presser foot.

4. Height of feed dog

Instructions for adjusting the height of the feed dog.

5. Feed timing

Details the process for adjusting the feed timing of the sewing machine.

6. Needle-to-hook timing

Explains how to adjust the timing between the needle and the hook.

7. Clearance between needle and hook

Procedure for adjusting the clearance between the needle and the hook.

8. Position of bobbin case positioning finger

Details the adjustment for the bobbin case positioning finger.

9. Momentum of thread take-up spring (absorbing amount of thread)

Instructions for adjusting the momentum of the thread take-up spring.

10. Tension of thread take-up spring

Procedure for adjusting the tension of the thread take-up spring.

11. Adjustment of bobbin thread tension

Explains how to adjust the bobbin thread tension.

12. Position of bobbin winder clutch

Details the adjustment for the position of the bobbin winder clutch.

13. Adjustment of bobbin winder

Provides instructions for adjusting the bobbin winder, including disengaging and leaf switch.

14. Position of threader support plate mas. asm. (TL-98Q)

Instructions for adjusting the position of the threader support plate assembly for TL-98Q.

15. Vertical position of threader hook (TL-98Q)

Details the adjustment for the vertical position of the threader hook for TL-98Q.

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