Brother Z-8550A Service Manual Page 118
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Z-8550A, 8560A
14. TROUBLESHOOTING
109
14. TROUBLESHOOTING
• Please check the following points before calling for repairs or service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the face plate of the control box. Touching areas where high voltages are present can result in
severe injury.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Problem Possible cause Page
1 Upper thread is not tight.
• Is the upper thread tension too weak, or is the lower thread tension
too strong?
Adjust the upper thread tension or lower thread tension.
• Was the thread threaded through the thread guide of the bobbin
case in accordance with the type and thickness of the sewing
article’s material.
Use thread guide A or B in
accordance with the material being
sewn.
Instruction
manual
Instruction
manual
2 Lower thread is not tight.
• Is the lower thread tension too weak, or is the upper thread tension
too strong?
Adjust the lower thread tension or upper thread tension.
• Was the thread threaded through the thread guide of the bobbin
case in accordance with the type and thickness of the sewing
article’s material.
Use thread guide A or B in
accordance with the material being
sewn.
Instruction
manual
Instruction
manual
0573M
0574M
3556M
3556M
- 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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