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Failure Investigation for Electronic Parts Bobbin winding cannot be done
Bobbin winding cannot be
done.
Adjust the bobbin winder
mechanism for correct
assembly and attachment
Is the bobbin winder mechanism
assembled and attached correctly?
Is the resistance between the BW-F
SW assy. connector pins 1 & 2
normal?
• Bobbin winder shaft in bobbin wind
position ………. 1
Ω
or less
• Bobbin winder shaft not in bobbin
wind position …
∞
N
N
Replace BW switch assy.
Y
Y
Replace the main PCB assy.
Reconnect it correctly
Is the connector of the BW-F SW assy.
correctly connected to CN1 of the main
PCB assy.?
N
Содержание B-500
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Страница 17: ...1 8 ...
Страница 19: ...2 2 Main parts Main parts location diagram Main unit ...
Страница 32: ...2 15 Disassembly Electrical parts and main motor Electrical parts and main motor location diagram Main unit ...
Страница 36: ...2 19 Disassembly Thread tension mechanism Thread tension mechanism location diagram Main unit ...
Страница 39: ...2 22 Bobbin winder mechanism Bobbin winder mechanism location diagram Main unit ...
Страница 43: ...2 26 Feed mechanism Feed mechanism location diagram Main unit ...
Страница 49: ...2 32 Base plate and handle Base plate and handle location diagram Main unit ...
Страница 52: ...2 35 Disassembly Needle presser module Needle presser module breakout diagram Modules ...
Страница 61: ...2 44 Feed and bobbin module Feed and bobbin module breakout diagram Modules ...
Страница 71: ...2 54 ...
Страница 73: ...3 2 Base plate and handle Base plate and handle location diagram Main unit ...
Страница 81: ...3 10 Feed mechanism Feed mechanism location diagram Main unit ...
Страница 84: ...3 13 Assembly Bobbin winder mechanism Bobbin winder mechanism location diagram Main unit ...
Страница 88: ...3 17 Assembly Thread tension mechanism Thread tension mechanism location diagram Main unit ...
Страница 93: ...3 22 Electrical parts and main motor Electrical parts and main motor location diagram Main unit ...
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Страница 101: ...3 30 Assembly Main parts Main parts location diagram Main unit ...
Страница 113: ...3 42 Assembly Needle presser module Needle presser module breakout diagram Modules ...
Страница 125: ...3 54 Assembly Feed and bobbin module Feed and bobbin module breakout diagram Modules ...
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Страница 187: ...6 1 6 Repair Manual ...
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