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Failure Investigation for Electronic Parts Thread tensioning does not go well
Set thread correctly
Thread tensioning is not right
Is the thread guide path correct?
N
Set the lower thread correctly
Is the lower thread placement correct?
N
Y
Use the correct combination
Is the material, thread and needle
combination correct?
N
Y
Adjust upper thread tension
or
Adjust upper thread tension disk
N
Y
Adjust inner rotary hook tension
Is the inner rotary hook tension right?
Is the tension right?
or
Is the thread tension adjuster gap correct?
N
Y
Replace pulse motor
Is the resistance between the 1 & 2
pins and 3 & 4 pins on the AT pulse
motor connectors (CN10) 4 – 6
Ω
?
N
Y
Replace main NF3D PCB assy.
Y
Summary of Contents for BLMY
Page 1: ......
Page 2: ......
Page 3: ......
Page 19: ...1 8 ...
Page 21: ...2 2 Main parts location diagram Main unit ...
Page 30: ...2 11 Disassembly Electrical parts and motors location diagram Main unit ...
Page 37: ...2 18 Thread tension mechanism location diagram Main unit ...
Page 43: ...2 24 Bobbin winder mechanism location diagram Main unit ...
Page 49: ...2 30 Needle bar presser mechanism Upper shaft mechanism location diagram Main unit ...
Page 53: ...2 34 Needle presser module breakout diagram 78 Modules ...
Page 66: ...2 47 Disassembly Feed and bobbin module breakout diagram Modules ...
Page 75: ...2 56 Thread cutter module breakout diagram Modules ...
Page 79: ...2 60 ...
Page 81: ...3 2 Needle bar presser mechanism upper shaft mechanism location diagram Main unit ...
Page 90: ...3 11 Assembly Bobbin winder mechanism location diagram Main unit ...
Page 94: ...3 15 Assembly Thread tension mechanism location diagram Main unit ...
Page 102: ...3 23 Assembly Electrical parts and motors location diagram Main unit ...
Page 109: ...3 30 Main parts location diagram Main unit ...
Page 120: ...3 41 Assembly Needle presser module breakout diagram 78 Modules ...
Page 139: ...3 60 Feed module breakout diagram Modules ...
Page 155: ...3 76 Thread cutter module breakout diagram Modules ...
Page 161: ...3 82 ...
Page 191: ...4 30 ...
Page 226: ......