2 104 72 63-26
Contents
Foreword .......................................................................................................................................3
Replacing the External Parts .........................................................................................................4
Face Plate .....................................................................................................................................4
Top Cover ......................................................................................................................................4
Belt Cover ......................................................................................................................................5
Motor Cover ...................................................................................................................................5
Base ..............................................................................................................................................5
Adjustment of the needle bar height ..............................................................................................6
Adjustment of the timing of the hook in relation to the needle .......................................................8
Adjustment of the clearance between needle and point of hook. ..................................................9
Adjustment of bobbin case position fi nger ...................................................................................10
Adjustment of the presser bar height and alignment ...................................................................11
Adjustment of the knee lifter lever ...............................................................................................12
Adjustment of the Feed Cam Timing ...........................................................................................13
Adjustment of the Feed Lifting Cam Timing................................................................................14
Adjustment of the parallelism and lengthwise movement of the Feed Dog ................................16
Adjustment of synchronizer .........................................................................................................17
Adjustment of bobbin thread tension ...........................................................................................18
Adjustment of pre-tension dial .....................................................................................................18
Adjustment of thread check spring stroke ...................................................................................19
Replace and Adjust the Thread Guide Plate ...............................................................................20
Adjustment of the Fixed Cutter Knife ...........................................................................................21
Adjustment of the needle to cutter cam timing............................................................................24
Adjustment of the thread drawing lever .......................................................................................25
Adjustment of the auto tension release .......................................................................................26
Thread Cutter Troubleshooting ....................................................................................................27
Adjustment of bobbin winder stopper ..........................................................................................28
Replacing the Electronic Components ........................................................................................29
Location of the Electronic Components .......................................................................................29
Location of the Connectors..........................................................................................................29
Internal Wiring .............................................................................................................................30
Replace the Circuit Board-A ........................................................................................................31
Replace the Circuit Board-F and Slide Volume ...........................................................................32
Replace the Light Bulb ................................................................................................................32
Replace the motor and Adjust the motor belt tension ..................................................................34
Replace the transformer ..............................................................................................................35
Replace the Machine Socket .......................................................................................................35
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