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LH4-B800E

4. ADJUSTMENT .......................................................................................................

4-1

4-1.

Adjusting the needle zigzag home position sensor position ....................................... 4-2

4-2.

Adjusting the feed home position sensor position ...................................................... 4-3

4-3.

Adjusting the presser foot home position sensor position .......................................... 4-5

4-4.

Adjusting the needle bar height .................................................................................. 4-6

4-5.

Adjusting the needle and rotary hook timing ............................................................... 4-6

4-6.

Adjusting the inner rotary hook and rotary hook holder overlap ................................. 4-8

4-7.

Adjusting the presser foot pressure ............................................................................ 4-8

4-8.

Adjusting the work clamp lift amount .......................................................................... 4-8

4-9.

Adjusting the work clamp lateral position .................................................................... 4-9

4-10. Adjusting the knife home position sensor position ...................................................... 4-9
4-11. Adjusting the knife installation position ..................................................................... 4-10
4-12. Adjusting the cutter installation height ...................................................................... 4-11
4-13. Adjusting the upper thread trimming ......................................................................... 4-12
4-14. Adjusting the lower thread trimming ......................................................................... 4-19
4-15. Adjusting the bobbin presser .................................................................................... 4-23
4-16. Adjusting the thread breakage detector .................................................................... 4-24
4-17. Adjusting the thread tension at the tack tension control ........................................... 4-25
4-18. Adjusting the thread tension at the zigzag tension control ....................................... 4-25
4-19. Adjusting the upper thread feeding amount .............................................................. 4-26
4-20. Adjusting the feed timing belt .................................................................................... 4-26
4-21. Adjusting the upper shaft timing belt ......................................................................... 4-27
4-22. Adjusting the rotary hook lubrication ......................................................................... 4-27
4-23. Adjusting the needle up stop position ....................................................................... 4-28
4-24. Adjusting the V-belt tension ...................................................................................... 4-28

5. TROUBLESHOOTING GUIDE ...............................................................................

5-1

5-1.

Needle thread breakage ............................................................................................. 5-1

5-2.

Skipped stitches .......................................................................................................... 5-3

5-3.

Uneven seams 1)......Beginning of sewing (1) ............................................................ 5-4

5-4.

Uneven seams 2)......Around rear tack or front tack ................................................... 5-6

5-5.

Uneven seams 3)......Loose thread end at end backtack (1) ...................................... 5-6

5-6.

Uneven seams 4)......Sticking in needle plate ............................................................. 5-6

5-7.

Uneven seams 5)......All stitches ................................................................................ 5-7

5-8.

Needle thread runout .................................................................................................. 5-8

5-9.

Unraveling of thread trimmed by upper thread trimmer assembly ............................ 5-10

5-10. Needle thread mis-trimming ...................................................................................... 5-10
5-11. Needle strikes upper thread trimmer ........................................................................ 5-11
5-12. Needle breakage ...................................................................................................... 5-12
5-13. (1)Imperfect cutter function (imperfect material cutting) ........................................... 5-13
5-14. Needle thread mis-winding ....................................................................................... 5-14
5-15. Folding clamp is not raised (1) Pulse motor stepping sound cannot be heard ......... 5-15
5-16. Lower thread is not trimmed (pulls when material is removed) ................................ 5-17
5-17. Feed mechanism does not operate or motor is out of step ...................................... 5-17
5-18. Needle does not zigzag or noise occurs when needle zigzags ................................ 5-18
5-19. Sewing machine stops during sewing ....................................................................... 5-18

6. ELECTRIC MECHANISM .......................................................................................

6-1

6-1.

Precautions at the time of adjustment ........................................................................ 6-1

6-2.

Components inside the control box and the operation panel ...................................... 6-2

6-3.

Fuse explanation ........................................................................................................ 6-3

6-4.

Connectors ................................................................................................................. 6-4

6-5.

Description of DIP switches ...................................................................................... 6-22