Brother Z-8550A Service Manual Page 88
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- Table of contents
- TROUBLESHOOTING
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Z-8550A, 8560A
9. ADJUSTMENTS
79
9-17. Adjusting the presser foot floating amount (minute lifting amount)
When sewing stretch materials and materials with long pile,
you can make minute adjustments to the floating amount for
the presser foot (1) in accordance with the material.
1. Turn the sewing machine pulley by hand to move the
feed dog (2) below the needle plate (3).
2. Use the lifting lever to lower the presser foot (1).
3. Loosen the nut (4).
4. Use a hexagon wrench to turn the adjusting screw (5) to
adjust the floating amount.
• To raise the presser foot (1) …Turn the adjusting
screw (5) clockwise.
• To lower the presser foot (1) ...Turn the adjusting
screw (5) counterclockwise.
5. Tighten the nut (4).
* After making the adjustment, sew a piece of material to
check the floating amount.
9-18. Adjusting the treadle
<Forward depression sensitivity adjustment>
If the machine starts running at low speed when your foot is
simply resting on the treadle, or if the treadle pressure is felt
to be too weak, adjust the position (a to c) at which the
treadle spring (1) is hooked onto the treadle lever (2).
* a is the weakest position, and it becomes gradually
stronger at b and c respectively.
<Backward depression sensitivity adjustment>
1. Loosen the nut (3) and turn the bolt (4).
* When the bolt (4) is tightened, the treadle operation
becomes heavier, and when it is loosened, the
operation becomes lighter.
2. Tighten the nut (3).
<Adjusting the treadle stroke>
Remove the nut (5), and then move the connecting rod joint
(6) from the position in figure A to the position in figure B.
The treadle stroke will then be increased by approximately
30 %.
At this time, the treadle forward and backward depression
sensitivity will change, so readjust if necessary.
3807M
3533M
Higher
Lower
3534M
2302M
Floating amount
- Z-8550A 1
- Z-8560A 1
- SAFETY INSTRUCTIONS 3
- DANGER 3
- CAUTION 3
- Environmental requirements 4
- Installation 4
- Cleaning 5
- Maintenance and inspection 6
- Oil pan 7
- (For Europe) 7
- CONTENTS 8
- 1. MACHINE SPECIFICATIONS 10
- 2. SEWING PATTERN 11
- 3. FUNCTION SETTINGS 12
- 3-3. Data initialization 23
- Green display 24
- Orange display 24
- DANGER 30
- 0) so that the 31
- (Initial setting is “0”) 31
- 4. USING CF CARDS 32
- 5. MECHANICAL DESCRIPTIONS 41
- 5-3. Zigzag mechanism 43
- 5-4. Presser foot mechanism 44
- 5-5. Feed mechanism 46
- 5-6. Lubrication mechanism 49
- 6. DISASSEMBLY 55
- 6-1. Covers 56
- 6-2. Presser foot mechanism 57
- 6-3. Needle bar mechanism 57
- 6-4. Zigzag mechanism 58
- 6-5. Rotary hook mechanism 60
- 6-6. Lubrication mechanism 61
- 6-7. Feed mechanism 61
- <Knife unit> 62
- 7. ASSEMBLY 64
- 7-2. Feed mechanism 65
- 7-3. Lubrication mechanism 66
- 7-4. Zigzag mechanism 67
- 7-5. Needle bar mechanism 68
- 7-6. Rotary hook mechanism 69
- 7-7. Presser foot mechanism 70
- 7-8. Covers 71
- Be careful of the knives 71
- CAUTION 73
- Setting for 1st turn 75
- Setting for 2nd turn 75
- 9. ADJUSTMENTS 76
- 9-3. Thread tension spring 78
- 9-4. Presser foot height 79
- 9-5. Feed dog height 79
- 9-6. Feed dog angle 80
- 9-9. Needle and feed timing 81
- 9-10. Needle bar height 82
- 9-13. Needle zigzag load 85
- Maximum zigzag width 86
- CAUTION 87
- 9-18. Adjusting the treadle 88
- Should not touch 93
- 10-2. Applying grease 95
- 11. ELECTRICAL MECHANISM 97
- 11-3. Description of fuses 99
- Z-8550A, 8560A 100
- 11-4-1. Connector positions 101
- 11-5. Troubleshooting 103
- 11-5-2. Diagnosis flowchart 104
- 11-5-3. Remedy 106
- 11-6. Wiring diagrams 110
- 12. TREADLE UNIT 112
- . Types 112
- 1) Entering signal settings 114
- 5) Ending the settings 115
- 13. STANDING OPERATION PEDAL 116
- 13-2. Connectors 117
- 14. TROUBLESHOOTING 118
- 15. ERROR CODES 123
- LCD display character list 126
- SERVICE MANUAL 128
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