Happy HCS-1201-30, Maintenance Manual

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Trouble shooting(Thread break)
7-2-2
Trouble Factor Cause of trouble and measure Page
Thread break
Mechanical
24. Check tip of keeper hit the bobbin case.
24-1 Adjust it regularly.
25. ls take-up lever timing proper ?
25-1 Adjust as specified. 3-2-7
26. No problem in timing belt?
26-1 Adjust tension. 3-8-1
26-2 If scratched or damaged, replace it. 3-8-2
27. No problem in motor belt?
27-1 Adjust tension. 3-8-3
27-2 If scratched or damaged, replace it. 3-8-4
28. Is revolution setting proper? (11-1)
28-1 Make automatic speed setting. 5-3-1
29. Is inverter setting proper ?
29-1 Make setting. 5-1
Operator 1. Operation is wrong (no proper [create] setting for sewing?)
1-1 Tell how to operate. (5-2)
2.Is pattern dwindled too much by pattern adjustment?
2-1 Adjust size so as to produce less thread break.
2-2 Use pattern edited again (density_ change).
3. Is thread tension properly set?
3-1 <Upper thread> Considering sewing finish, set tension. (8-1)
3-2 <Bobbin thread> Considering upper thread tension, set tension. (4-5)
4. Is bobbin winding proper?
4-1 Adjusting bobbin winding tension, wind with proper strength. (4-4)
5. Is bobbin put in bobbin case properly?
5-1 Viewing from front of bobbin case, set so that bobbin turns left-wise. (4-5)
6. Does thread cone stand properly? (4-6)
6-1 Keep thread from hitting felt.
6-2 Stand vertically.
7. Is passing of thread proper?
7-1 Pass thread properly. (4-7)
8. Is cloth properly stretched? (6-2) (7-5)
8-1 No loosening and no too much tightening. Even tension in depth and width.
8-2 Texture should be even in direction of X and Y.
9. Is frame properly set? (6-3) (7-6)
9-1 Frame should be put in positioning hole on tubular-frame.
9-2 No loosening of screw.
( ) ----- Reference instruction book