JUKI MF-7900 Series Engineer's Manual page 79

4) Adjusting the machine head (direct-drive motor type sewing machine only)
(Caution) When the slip between the marker line F on the hand-wheel and the concave E of the ma-
chine head is excessive after thread trimming, adjust the angle of the machine head by the
operation below.
❸ ❹
❸ ❹
E
❸ ❹
Ⓐ
❺ ❻
Ⓑ
❺
❻
F
❺
❻
– 65 –
1. Simultaneously pressing
❹ and switch ❺ , turn ON the
power switch.
is displayed ( Ⓐ ) in the indica-
2.
tor and the mode is changed over to
the adjustment mode.
3. Turn the pulley of the machine head
by hand until the main-shaft reference
signal is detected. At this time, the
degree of and angle from the main-
shaft reference signal is displayed
on the indicator Ⓑ . (The value is the
reference value.)
In this state, align the marker line F
4.
of the handwheel with the concave
E of the machine head shown in the
figure.
switch ❻ to finish the
5. Press
adjustment work. (The value is the
reference value.)
switch