Brother Z-8550A Service Manual Page 73
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8. CHANGING THE FEED AMOUNT TO LONG STITCH SPECIFICATIONS (from 2.0mm to 5.0mm)
Z-8550A, 8560A
64
8. CHANGING THE FEED AMOUNT TO LONG STITCH
SPECIFICATIONS (from 2.0mm to 5.0mm)
CAUTION
Replacement of parts should only be carried out by a qualified technician.
Turn off the power switch and disconnect the power cord before carrying out this operation.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
When removing the needle plate and the auxiliary needle plate, use a screwdriver that matches the size of the
screw heads.If a screwdriver that does not match the size of the screw heads is used, it may damage the screw
heads and result in injury to the operator or damage to the articles being sewn.
Use only the proper replacement parts as specified by Brother.
1. Replace the feed dog (1) and needle plate (2) with the
ones for long stitches.
2. After this, change the maximum feed amount as
described below.
Changing the maximum feed amount
If the feed dog has been replaced by one that does not match the feed amount that is currently being used, the feed dog may
touch the needle plate if the stitch length dial or condense dial are mistakenly set to settings that are larger than the maximum
feed amount for the feed dog, and this could cause problems such as damage or noise.
In order to prevent dial setting errors such as this, change the maximum feed amount setting for the sewing machine to match
the maximum feed amount for the feed dog.
1. Tilt back the machine head.
2. For sewing machine models and specifications other than
8550A-031, loosen the two screws (1) so that the quick
reverse solenoid (2) can be moved up and down.
3. Loosen the screws (3) and (4).
4. Move the stopper (5) down as far as possible, and move
the stopper (6) up as far as possible.
(Continued on next page)
3499M
1178B
3498M
- 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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