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CONTENTS
1. SPECIFICATIONS ............................................................................................................ 1
2. NAME OF EACH COMPONENT ..................................................................................... 3
3. INSTALLATION ................................................................................................................ 4
3-1. Caution at the time of set-up ................................................................................................................................ 4
3-2. Installation of the sewing machine ...................................................................................................................... 5
3-3. Adjusting the height of the knee lifter ................................................................................................................. 6
3-4. Installation of thread stand ................................................................................................................................... 6
4. PREPARATION OF THE SEWING MACHINE ................................................................ 7
4-1. Method of lubrication ............................................................................................................................................ 7
4-2. Lubrication to the oil tank ..................................................................................................................................... 8
4-3. Draining of oil from the oil tank ............................................................................................................................ 9
4-4. Adjusting the amount of oil in the hook .............................................................................................................. 9
4-5. Oil in the feed box ................................................................................................................................................ 10
4-6. Applying grease ................................................................................................................................................... 11
4-7. Setting up the SC-920 .......................................................................................................................................... 14
4-8. Installing the belt cover (For LH-3528A, 3568A, 3578A and 3588A) ................................................................ 18
4-9. Attaching the needles .......................................................................................................................................... 18
4-10. How to take out the bobbin case ...................................................................................................................... 19
4-11. Inserting a bobbin in a bobbin case ................................................................................................................. 19
4-12. Threading the machine head ............................................................................................................................ 20
4-13. Thread tension ................................................................................................................................................... 23
4-14. Winding the bobbin thread ............................................................................................................................... 24
4-15. Thread take-up spring ....................................................................................................................................... 25
4-16. Adjusting the stitch length ................................................................................................................................ 27
4-17. Needle-to-hook relation ..................................................................................................................................... 27
4-18. Pedal pressure and pedal stroke...................................................................................................................... 29
4-19. Adjustment of the pedal .................................................................................................................................... 29
5. OPERATION OF THE SEWING MACHINE .................................................................. 30
5-1. Pedal Operation ................................................................................................................................................... 30
5-2. Hand lifter ............................................................................................................................................................. 30
5-3. Adjusting the pressure of the presser foot ....................................................................................................... 31
5-4. Micro-lifter ............................................................................................................................................................ 31
5-5. Thread tension release changeover when using the knee lifter ..................................................................... 32
5-6. One-touch manual reverse feed (One-touch reverse feed type) ..................................................................... 32
6. MAINTENANCE ............................................................................................................. 33
6-1. Procedure of changing over between bottom feed and needle feed and the adjustment
(for LH-3528A only) ............................................................................................................................................. 33
6-2. Changing the feed timing .................................................................................................................................... 35
6-3. Adjusting the thread trimming cam ................................................................................................................... 36
6-4. Adjusting the hook needle guard ....................................................................................................................... 37
6-5. Adjusting the inner hook guide .......................................................................................................................... 37
6-6. Adjusting the height and the inclination of the feed dog ................................................................................. 38
6-7. Replacing the gauge ............................................................................................................................................ 39
6-8. Adjusting the thread presser spring .................................................................................................................. 39
6-9. Adjusting the position of the moving knife ....................................................................................................... 40
6-10. Adjusting the counter knife position and the knife pressure ........................................................................ 41
6-11. Position of the wiper .......................................................................................................................................... 42
6-12. Caution when installing the attachments ........................................................................................................ 42
6-13. Replacing the bobbin thread slack preventer spring (For LH-3568A, 3568A-7, 3588A and 3588A-7) ........ 43
6-14. Stop of the needle bars and angle of corners for corners stitching
(For LH-3568A, 3568A-7, 3588A and 3588A-7) .................................................................................................. 43
7. STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE) .. 44
8. GAUGE SETS ................................................................................................................ 45
9. TROUBLES AND CORRECTIVE MEASURES ............................................................. 54
10. MOTOR PULLEY AND BELT ...................................................................................... 56
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