Table Of Contents - ELNA eXcellence 780 Service Manual

Table of Contents

Face cover ...........................................................................................................................................1

Top cover .............................................................................................................................................1

Belt cover ............................................................................................................................................2

Machine base ......................................................................................................................................3

Base cover ..........................................................................................................................................3

Bed cover ............................................................................................................................................3

Free arm cover ................................................................................................................................ 4-5

Front cover ...................................................................................................................................... 6-7

Rear cover ....................................................................................................................................... 8-9

Replacing Electronic Components

Printed circuit board A ................................................................................................................. 10-11

Printed circuit board F .......................................................................................................................12

Switching power supply unit ..............................................................................................................13

Driving motor .....................................................................................................................................14

Thread tension unit ...........................................................................................................................15

Mechanical Adjustment

Feed dog height ................................................................................................................................16

Needle drop position .........................................................................................................................17

Clearance between needle and tip of the rotary hook ................................................................ 18-19

Hook timing .......................................................................................................................................20

Needle bar height ..............................................................................................................................21

Backlash between hook drive gear and lower shaft gear ..................................................................22

Upper shaft shield plate position .......................................................................................................23

Upper thread tension.........................................................................................................................24

Tension release mechanism ..............................................................................................................25

Replacing Needle threader hook.......................................................................................................26

Needle threader hook position ..........................................................................................................27

Thread drawing lever .........................................................................................................................28

Upper feed dog (1) ............................................................................................................................29

Upper feed dog (2) ............................................................................................................................30

Upper feed dog (3) ............................................................................................................................31

Buttonhole lever ................................................................................................................................32

Thread cutter .....................................................................................................................................33

Presser bar lifter position ..................................................................................................................34

Presser foot lifter stopper position (1) ...............................................................................................35

Presser foot lifter stopper position (2) ...............................................................................................36

Automatic presser foot lifter initializing position .................................................................................37

Presser bar height .............................................................................................................................38

Stretch stitch feed balance ................................................................................................................39

Needle plate switch ...........................................................................................................................40

Knee lifter ..........................................................................................................................................41

INDEX