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Failure Investigation for Electronic Parts Main motor does not turn
Adjust the assy. of upper shaft
Reconnect it correctly
Does the pulley turn easily?
Are the resistance values for the
Stop/Start switch, reverse switch,
raise needle switch and the thread
cut switch normal?
• Switch resistance values
Switch pressed …
1
Ω
or less
Switch released …
∞
N
N
N
N
Y
Is the main motor connector correctly
connected to CN1 of power supply
unit F?
Y
Replace main motor
Replace SS-VR F2 PCB assy.
Is the main motor resistance 1.5 – 3.5
Ω
?
Y
Y
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Main motor does not turn
Summary of Contents for BLMY
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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 ...
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