Upper Thread Tension - Brother PE770 Service Manual

Adjustment
[Adjustment standard]
Start test mode, pass the schappe spun thread #60 through the thread guide, tension plate, tension disk and plate
assembly, and pull it by tension gauge, then adjust tension must be in 0.412 to 0.461N (42 to 47g).
[Adjustment procedure]
1. Remove the embroidery unit from the machine.
2. Remove the front thread guard cover.
3. Start the test mode (AT pulse motor initializes).
4. Raise the presser foot lever.
5. Pass the schappe spun thread #60 through the thread guide, tension plate, tension disk and plate assembly in this
order.
6. Lower the presser foot lever.
7. Pull the thread by a tension gauge, and turn the thread tension adjusting screw, and adjust the tension to 0.412 to
0.461N (42 to 47g).
8. Apply a small amount of thread locker to thread tension adjusting screw.
Thread locker for thread tension adjusting screw Small amount
XA9154001
Thread tension adjusting screw
*Key point
• Before adjusting, remove the embroidery unit.

Upper thread tension

Tension gauge 50 (0.5 N)
Tension disk
Plate assembly
0.412 - 0.461N (42 - 47g)
Tension plate
Thread guide
4 - 9