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TABLE OF CONTENTS
A.REMOVING THE FRONT COVER ............................. 2
B. REPLACING THE FRONT COVER ........................... 4
1. HEIGHT OF NEEDLE BAR ........................................ 5
2. GAP BETWEEN NEEDLE AND HOOK ..................... 6
3. TIMING OF THE HOOK ............................................. 7
4. HEIGHT OF THE FEED DOG .................................... 8
5. NEEDLE PLATE AND NEEDLE POSITON ............... 8
6. TIMING OF THE FEED MOTION .............................. 9
7. ADJUSTING THE FORWARD AND REVERSE
STITCH ................................................................. 10
8. BOBBIN WINDER .................................................... 10
9. HEIGHT AND DIRECTION OF PRESSER FOOT ... 11
10. HEIGHT OF NEEDLE THREADER ....................... 11
11. ZIGZAG TIMING • NEEDLE STOP POSITION ..... 12
12. MOTOR BELT TENSION ....................................... 12
13. TIMING BELT TENSION ........................................ 12
14. BACKLASH OF HOOK GEAR ............................... 13
15. UPPER THREAD TENSION UNIT ......................... 13
16. ADJUSTING THE LOWER THREAD TENSION .... 13
LOCATING THE DEFFECTED ELECTRICAL PART .. 14
The self-diagnostic program ......................................... 14
HOW TO CHECK ......................................................... 14
a. Frequency of power line ........................................... 14
b. Condition of switches and sensors .......................... 15
b-1. Adjustment for buttonhole lever position ............... 16
c. Phase of feed pulse motor ....................................... 17
d. Phase of zigzag pulse motor .................................... 17
e. Condition of foot controller and speed control lever . 17
WARNING MESSAGES ON LCD ................................ 17
TROUBLE SHOOTING OF ELECTRICAL PARTS ...... 18
