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
1. Is thread cut timing proper?
thread cut 1-1 Set timing to specified value. 3-6-3
(E-190) 1-2 Check no loosening of screw on thread cut cam.
(E-193) 2. Isn't rubbing of fixed knife and moving knife weak?
2-1 Adjust to be able to rub properly. 3-6-6
3. Does moving knife make smooth move?
3-1 Push up thread cut solenoid to check by opening and closing moving knife. (10-2)
3-2 Check if rubbing of moving knife and fixed knife is not too strong. 3-6-6
4. Check Displace of moving knife.
4-1 Adjust of moving knife position.
5. Check defacement of moving knife or fixed knife.
5-1 If possible, furnish with file.
5-2 Replace 3-6-4
3-6-5
6. No backlash in up and down direction of knife drive shaft? 3-6-4
6-1 Check no loosening of screw on moving knife.
6-2 Check no loosening of screw on knife drive shaft.
7. No backlash in fixed knife? 3-6-6
7-1 Check no loosening of screw on fixed knife.
8. Does thread cut solenoid work properly?
8-1 Check cable.
8-2 If trouble found in CPU board, replace.
8-3 If trouble found in thread cut solenoid, replace.
9. No trouble in thread cut drive?
9-1 If thread cut roller broken, replace. 3-6-1
9-2 If roller screw gets loosened, tighten firmly.
10. Is number of revolution proper at time of thread cut? (11-1)
10-1 Make automatic speed setting. 5-3-1
10-2 If trouble in CPU board, replace.
11. Is there no skipped stitch?
11-1 Adjust needle depth. 3-3-3
11-2 Adjust clearance between needle and rotary hook. 3-5-1
11-3 Is height of pressure foot proper? 3-2-9
11-4 Is rotary hook timing proper? 3-5-1
11-5 Is relation between needle and thread proper?
( ) ----- Reference instruction book