Brother Z-8550A ELECTRICAL MECHANISM, TABLE, ERROR CODES, TREADLE UNIT, 9. ADJUSTMENTS, TROUBLESHOOTING, 10. APPLYING GREASE, STANDING OPERATION PEDAL

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

Z-8550A, 8560A