HappyJapan HCR3-1502, Maintenance Manual

Page: 190 / 216

190
Trouble Factor Cause of trouble and measure Page
Thread break
Mechanical
11. No problem in rotary hook? 2-8
11-1 Clean it to remove lints. ( 23-2 )
11-2 Furbish scratch.
11-3
If backlash of bobbin case holder and outer hook grows bigger, replace them.
11-4 Replace.
12. No problem in rotary hook retainer?
12-1 Remove burr and scratch.
12-2 Adjust position. 4-4-2
13. No problem in needle?
13-1 Fix it properly . 3-1
13-2 Select proper size of needle to match thread thickness. 3-3
13-3 If tip of needle is warped or bent, replace. 2-8
13-4 Replace.
14. No problem in bobbin case?
14-1 Remove rust and scratch.
14-2 If thread guide spring is off, replace it.
15. No problem in bobbin?
15-1 Remove scratch (iron bobbin).
15-2 If distorted. replace it.
16. Is needle bar spring not broken?
16-1 Replace it. 4-2-9
17. Does needle bar make smooth movement?
17-1 If bent, replace it. 4-2-9
18. Needle doesn't drop in the center of needle hole.
18-1 Adjust positioning plate and adjust needle drop back and forth. 4-2-3
18-2
Adjust position of needle selection unit, then adjust needle drop right and left. 4-2-4, -5
19. Is the lowest needle position proper?
19-1 Adjust mechanical lowest needle position.
19-2 Adjust electric lowest needle position. E2-2
20. Is needle height proper?
20-1 Adjust as specified. 4-2-6
21. Is rotary hook timing proper?
21-1 Adjust as specified. 4-4-1
22. Is clearance between needle and rotary hook proper?
22-1 Adjust as specified. 4-4-1
( ) ----- Reference instruction book