Brother Z-8550A 사용자 매뉴얼

 

 

Z-8550A, 8560A 

109 

•  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. 

 

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. 

 

 

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