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Janome JW7630 User Manual

Janome JW7630
39 pages
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SERVICE MANUAL
MODEL: JW7630
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Janome JW7630 Specifications

General IconGeneral
Stitch Options30
Buttonhole Styles1
Maximum Stitch Width7mm
Maximum Stitch Length5mm
Needle Positions3
Foot PedalYes
Bobbin TypeDrop-in
Needle ThreaderYes
Included AccessoriesBobbins, Needle Set, Screwdriver, Seam Ripper, Spool Holder
TypeMechanical Sewing Machine
Presser FeetZipper Foot, Buttonhole Foot

Summary

Troubleshooting Sewing Issues

Skipping Stitches

Troubleshooting common causes and fixes for skipped stitches.

Fabric Not Moving

Troubleshooting common causes and fixes for fabric feed problems.

Presser Bar Height and Alignment

Needle Drop Position

Needle Bar Height

Needle to Hook Timing

Needle Clearance to Hook

Backlash (Between Lower Shaft Gear and Hook Gear)

Feed Dog Height

Zigzag Synchronization

Tension Release Mechanism

Needle Thread Tension

Stretch Stitch Feed Balance

Needle Threader Plate Replacement and Adjustment

Connector Diagram

Self Diagnostic Tests - Overview

Preliminary Test Procedures

Initial checks for machine response and light issues.

Entering Diagnostic Modes

Steps to access the diagnostic modes.

Self Diagnostic Tests - LED and Switch Tests

7-segment LED and Mode LED Tests

Verifying the 7-segment LED and Mode LED functions.

Switch and Bobbin Winder Switch Tests

Verifying switch operations and bobbin winder switch.

Self Diagnostic Tests - Sensor Tests

Buttonhole and Upper Shaft Sensor Tests

Testing the buttonhole and upper shaft sensors.

Sewing Speed Sensor Test

Testing the sewing speed sensor.

Self Diagnostic Tests - Control and Motor Tests

Slide Volume and Foot Controller Tests

Testing slide volume and foot controller functions.

Motor Tests (Zigzag Width and Feed)

Testing zigzag width and feed motors.

Self Diagnostic Tests - DC Motor Test

DC Motor Functionality Test

Testing the DC motor operation and speed.

Adjusting Buttonhole Lever Position

Adjusting the Bobbin Winder Switch

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