HappyJapan HCD2-1501-40, Maintenance Manual

Page: 177 / 198

165
11-2-3 Trouble shooting (Erroneous thread cut)
Trouble Factor Cause of trouble and measure Page
Erroneous
Mechanical
11. Check the needle bar moves up and down during thread cut.
thread cut 11-1 Adjust position of jump device. 3-2-7
(E-190) 11-2 Replace needle bar cushion. 3-3-7
(E-193) 11-3 Replace needle bar driver. 3-2-6
12. Is position of keeper proper?
12-1 Adjust the fixed position regularly. 3-6-8
13. Check the movement of keeper goes smoothly.
13-1 Readjust if it is not smooth. 3-6-7
Operator 1. No negligence in cleaning thread cut device? (23-2)
1-1 Tell to clean regularly.
# It's desirable to prepare brush with soft hair and air gun.
2. Is timing of thread tension proper?
2-1 <Upper thread> Considering sewing finish, set tension. (8-1)
2-2 <Bobbin thread> Considering upper thread tension, set tension. (4-5)
Environment
1. Are power and voltage rated and stable?
1-1 Supply rated voltage. (23-1)
Thread & 1. Is twist of thread too strong?
cloth 1-1 Use thread with proper twist. 3-1-3
2. No skipping by use of lots of paste?
2-1 Use small amount of paste.
2-2 Remove paste stuck to needle.
( ) ----- Reference instruction book