4 - 11
Adjustment (Main Unit)
Inspection and
Adjustment
Cassette threading height adjustment
1. Perform 4 - 23 "Adjust the needle thread block."
2. Attach the operation PCB assy. flat cable and power PCB assy. lead wire connector to the main PCB assy., and
attach the front cover to the arm bed. (without screwing it on).
3. Turn the power on.
4. Turn the pulley counterclockwise by hand, and stop just before the LED lamp changes from green to red
(green light/needle up stop position).
5. Turn off the power.
6. Remove the front cover.
NOTE •Be careful that the pulley position does not shift at this time.
7. Prepare a cassette (set up the thread)
8. Insert the cassette, and lower the shuttle to the lowest point (Position where the shuttle is extended to the lowest
point and the threading hook starts to move).
9. Loosen the screw, bind M3X4, and screw, pan (S/P washer) M3X6, and adjust the position of the thread guide
base assy.
10. Fully tighten screw, bind M3X4, and screw, pan (S/P washer) M3X6.
Distance from the upper edge of the needle hole to
the thread
2.1 +/-0.3 mm
Distance from the front of the needle to the thread 0.8 +/-0.2 mm
Screw, bind 3x4
, torque 0.57 - 0.79 N-m
Screw, pan (S/P washer) M3X6
torque 0.57 - 0.79 N-m
Screw, bind 3 × 4
Set screw, socket 3 × 6
Shuttle extended all the way
Thread hook starts to move
Thread
Needle
Front view Side view
Needle
Thread
2.1 ± 0.3mm
0.8 ± 0.2mm
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