Brother International Z-8550A Instruction Manual - English - Page 82

Troubleshooting, 15-1. Sewing

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15. TROUBLESHOOTING 15. 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. 15-1. Sewing Items with a "*" in the "Page" column should only be checked by a qualified technician. Problem Possible cause 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. Page 47 16 0573M 3556M 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. 47 • 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. 16 0574M 3556M Z-8550A, 8560A 74

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Z-8550A, 8560A
15. TROUBLESHOOTING
74
15. 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.
15-1. Sewing
Items with a “*” in the “Page” column should only be checked by a qualified technician.
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.
47
16
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.
47
16
0573M
0574M
3556M
3556M