SERVICE MANUAL
2
Table of contents
REMOVING THE EXTERIOR PARTS ............................................................. 3
A. Light Cover ................................................................................................ 3
B. Base .......................................................................................................... 3
C. Top Cover (Flap) ....................................................................................... 4
D. Hinge Cover .............................................................................................. 4
E. Thread Tension Cover .............................................................................. 4
F. Side Enclosure .......................................................................................... 5
G. Handle and Unit Cover .............................................................................. 5
H. Needle Plate .............................................................................................. 6
I. Front Enclosure ......................................................................................... 7
J. Rear Enclosure ......................................................................................... 8
K. Front panel (from Front Enclosure) ........................................................... 8
REPLACING THE EXTERIOR PARTS ............................................................ 9
K. Front panel (to Front Enclosure) ............................................................... 9
J. Rear Enclosure ......................................................................................... 9
I. Front Enclosure ....................................................................................... 10
H. Needle Plate ............................................................................................ 10
G. Handle and Unit Cover ............................................................................ 11
F. Side Enclosure ........................................................................................ 12
E. Thread Tension Cover ............................................................................ 12
D. Hinge Cover ............................................................................................ 12
C. Top Cover (Flap) ..................................................................................... 13
B. Base ........................................................................................................ 13
A. Light Cover .............................................................................................. 14
CHECK AND ADJUSTMENT ......................................................................... 15
1. HEIGHT OF NEEDLE BAR ..................................................................... 15
2. GAP BETWEEN NEEDLE AND HOOK .................................................. 16
3. TIMING OF THE HOOK .......................................................................... 17
4. HEIGHT OF THE FEED DOG ................................................................. 18
5. NEEDLE PLATE AND NEEDLE POSITION ........................................... 19
6. TIMING OF THE UPPER AND LOWER SHAFT..................................... 20
7. ADJUSTING THE FORWARD REVERSE STITCH ................................ 21
8. BOBBIN WINDER ................................................................................... 22
9. HEIGHT AND DIRECTION OF PRESSER FOOT .................................. 23
10. HEIGHT OF NEEDLE THREADER......................................................... 24
11. ADJUSTMENTS FOR BUTTONHOLE LEVER POSITION .................... 25
12. MOTOR BELT TENSION ........................................................................ 26
13. TIMING BELT TENSION ......................................................................... 26
14. BACKLASH OF HOOK GEAR ................................................................ 27
15. UPPER THREAD TENSION UNIT .......................................................... 28
16. ADJUSTING THE LOWER THREAD TENSION ..................................... 28
17. FLATNESS OF THE BASE ..................................................................... 28
LOCATING THE DEFFECTED ELECTRICAL PART .................................... 29
1. To turn off the audible beep .................................................................... 29
2. The self-diagnostic program .................................................................... 29
3. Messages on LCD (9940/9920) .............................................................. 33
4. Electrical Parts Connection ..................................................................... 34
SINGER® is a registered Trademark of The Singer Company Ltd.
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