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5 - 3
Electronic Parts
Failure Investigation for Electronic Parts Power does not come on
When the power is turned ON, the
buzzer does not sound
Replace inlet assy.
Replace power supply F
With the power cord plugged into an
outlet, is the voltage between pins 1 and
2 on the inlet assy. connector 120 V AC?
Are the voltages between pins 3 & 4,
pins 5 & 4 and pins 6 & 7 of CN14 on
the Main NF3D PCB assy. normal?
• Pins 3 – 4 ... 5 V DC
• Pins 5 – 4 ... 26 V DC
• Pins 6 – 7 ... 26 V DC
N
N
Y
Replace the SS-VR F2 PCB
assy.
Does the buzzer sound when the power
is turned ON with the SS-VR F2 PCB
assy. connector disconnected from the
SS-VR F2 PCB assy.?
N
Y
Replace operation U22 PCB
assy.
Does the buzzer sound when the power
is turned ON with the operation U22
PCB assy. connector disconnected from
the main NF3D PCB assy.?
N
Y
Y
Replace main NF3D PCB assy.
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: ......