Happy HCS-1201-30, Maintenance Manual

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Trouble shooting(Erroneous thread cut)
7-2-3
Trouble Factor Cause of trouble and measure Page
Erroneous
Mechanical
12. Check the needle bar moves up and down during thread cut.
thread cut 12-1 Adjust position of jump solenoid. 3-2-5
(E-190) 12-2 Replace needle bar cushion. 3-3-4
(E-193) 12-3 Replace needle bar driver. 3-2-4
13. Is position of keeper proper?
13-1 Adjust the fixed position regularly. 3-6-10
14. Check the movement of keeper goes smoothly.
14-1 Readjust if it is not smooth. 3-6-9
Operator 1. No negligence in cleaning thread cut device? (10-2)
1-1 Tell to clean regularly.
# It's desirable to prepare brush with soft hair and air gun.
2. Is drive greased?
2-1 Apply grease to thread cut cam.
3. Is timing of thread tension proper?
3-1 <Upper thread> Considering sewing finish, set tension. (8-1)
3-2 <Bobbin thread> Considering upper thread tension, set tension. (4-5)
Environment
1. Are power and voltage rated and stable?
1-1 Supply rated voltage.
Thread & 1. Is twist of thread too strong?
cloth 1-1 Use thread with proper twist.
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