JUKI MF-7900 Series Engineer's Manual page 111

Adjustment procedures
1. DOWN position
(1) DOWN position of the needle is the position where top end B
of the looper has scooped loop A of the left needle thread.
If it is incorrect, adjust the down position of the needle by func-
tion setting No.122 (DOWN position starting angle compensa-
tion) of SC-921.
* When performing the machine type setting, it is set to be
stopped at a position described above.
2. UP position
(1) UP position of the needle is the position that the mark
the machine head side aligns with the mark
upper side) on the handwheel
If it is incorrect, adjust the down position of the needle by func-
tion setting No.121 (UP position starting angle compensation)
of SC-921.
* When performing the machine type setting, it is set to be
stopped at a position described above.
C
D
(marker line of
❶
.
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Results of Improper adjustment
on