Baby Lock BL7800 Service Manual page 39

1. When power is turned on, buzzer does not sound and the LED does not
light up ...............................................................................................................38
2. After the power is turned on, pulse motors do not return to their home
positions with respect to the needle position (Zigzag pulse motor when
needle bar is raised and feed pulse motor when needle bar is lowered) ....38
3. Pattern cannot be selected...............................................................................38
4. Main motor does not run ..................................................................................38
5. Operation of main motor is not stable, maximum speed operation is not
possible, or speed cannot be adjusted ...........................................................39
6. Correct patterns are not created......................................................................39
7. Buttonholes are not stitched correctly............................................................39
8. Manual operation of feed and zigzag is not possible ....................................39
9. Vertical movement of the needle bar and backstitch operation are
abnormal ............................................................................................................40
10. Foot controller does not operate normally when depressed........................40
11. Thread tension can not be set well..................................................................40
12. Needle bar release mechanism does not operate correctly..........................40
13. Thread cutting does not operate normally......................................................40
14. LED does not light up .......................................................................................40
15. Thread can not be wound around the bobbin ................................................40
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