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Z-8550A, 8560A
9. ADJUSTMENTS ...................................67
9-1. Actuator position............................................... 67
9-2. Adjusting the safety switch position.................. 68
9-3. Thread tension spring....................................... 69
9-4. Presser foot height ...........................................70
9-5. Feed dog height................................................ 70
9-6. Feed dog angle................................................. 71
9-7. Feed dog forward/back and
sideways position .............................................71
9-8. Feed amounts for reverse stitching and
condense stitching............................................ 72
9-9. Needle and feed timing..................................... 72
9-10. Needle bar height ........................................... 73
9-11. Needle zigzag forward/back position ............. 74
9-12. Needle zigzag sideways position ................... 75
9-13. Needle zigzag load......................................... 76
9-14. Needle and rotary hook timing ....................... 76
9-15. Bobbin case holder bracket position ..............77
9-16. Adjusting the rotary hook lubrication amount.... 78
9-17. Adjusting the presser foot floating amount
(minute lifting amount).................................... 79
9-18. Adjusting the treadle....................................... 79
9-19. Adjusting the quick reverse device
(8550A-A31, 8560A)....................................... 80
9-20. Adjusting the tension release during thread
trimming (8560 only)....................................... 81
9-21. Adjusting the position of the thread trimming
cam (8560A only) ........................................... 82
9-22. Adjusting the tension of the plate spring
(8560A only) ................................................... 83
9-23. Adjusting the thread trailing length after
thread trimming (8560A only)......................... 83
9-24. Adjusting the thread wiper
(8560A only, optional device)......................... 84
10. APPLYING GREASE
(When “GrEASEUP” appears)..............85
10-1. To continue sewing temporarily without
applying grease .............................................. 85
10-2. Applying grease ..............................................86
10-3. Resetting the cumulative operating time.........87
11. ELECTRICAL MECHANISM ..............88
11-1. Precautions while carrying out adjustments ...88
11-2. Control box internal configuration ...................89
11-3. Description of fuses ........................................90
11-3-1. Power supply P.C. board
(fuses and fuse resistors) ...................90
11-3-2. Main P.C. board
(fuses and fuse resistors) ...................91
11-4. Description of connectors ...............................92
11-4-1. Connector positions............................92
11-5. Troubleshooting ..............................................94
11-5-1. Troubleshooting procedure ................94
11-5-2. Diagnosis flowchart ............................95
11-5-3. Remedy ..............................................97
11-6. Wiring diagrams ............................................101
12. TREADLE UNIT................................ 103
12-1. Types ............................................................103
12-2. Standard setting values ................................104
12-3. Standard settings
for treadle depression stroke........................105
13. STANDING OPERATION PEDAL .... 107
13-1. Installing the foot plug...................................107
13-2. Connectors....................................................108
14. TROUBLESHOOTING...................... 109
15. ERROR CODES ............................... 114
16. SEGMENT DISPLAY DEFINITION
TABLE .............................................. 117