5 - 24
Failure Investigation for Electronic Parts Upper thread sensor does not work normally
Upper thread sensor does not
work normally
Reconnect the main PCB
assembly and upper thread
PCB assembly.
Are the main PCB assembly and
upper thread PCB assembly
correctly connected?
N
Y
Replace the up thread PCB
assy.
When the slit section of the upper
thread PCB assembly is switched
to the open / closed position with
the power on, does the voltage
between pins 2 and 3 on the main
PCB assembly (CN24) change
between 0 - 3.3 V DC?
N
Y
Replace main PCB assy.
Summary of Contents for Innov-is NV4000D
Page 1: ......
Page 2: ......
Page 19: ...1 5 Outline of Mechanism Outline of Mechanism Control system block diagram ...
Page 24: ...2 2 Main parts location diagram Main unit ...
Page 40: ...2 18 Power unit motor unit location diagram Main unit ...
Page 46: ...2 24 Thread tension unit location diagram Main unit ...
Page 57: ...2 35 Disassembly Bobbin winder location diagram Main unit ...
Page 66: ...2 44 Needle presser unit needle threader unit upper shaft unit location diagram Main unit ...
Page 71: ...2 49 Disassembly Needle presser module location diagram Modules ...
Page 89: ...2 67 Disassembly Needle thread module location diagram Modules ...
Page 95: ...2 73 Disassembly Feed rotary hook module location diagram Modules ...
Page 109: ...2 87 Disassembly Side feed module location diagram Modules ...
Page 112: ...2 90 Thread cutter module location diagram Modules ...
Page 117: ...2 95 Disassembly Main parts location diagram Embroidery ...
Page 134: ...3 2 Needle presser unit needle threader unit upper shaft unit location diagram Main unit ...
Page 146: ...3 14 Bobbin winder unit location diagram Main unit ...
Page 154: ...3 22 Thread tension unit location diagram Main unit ...
Page 169: ...3 37 Assembly Power unit motor unit location diagram Main unit ...
Page 175: ...3 43 Assembly Main parts location diagram Main unit ...
Page 191: ...3 59 Assembly Thread cutter module location diagram Module ...
Page 198: ...3 66 Side feed module location diagram Module ...
Page 202: ...3 70 Feed rotary hook module location diagram Module ...
Page 227: ...3 95 Assembly Needle thread module location diagram Module ...
Page 236: ...3 104 Needle presser module location diagram Module ...
Page 266: ...3 134 Main parts location diagram Embroidery ...
Page 369: ...6 1 6Special Instructions of Wiring ...
Page 372: ...5 Upper shaft cover 6 Lead wire guide of PCB holder 1 2 3 6 4 ...
Page 378: ...1 Front cover 2 Front cover Tie with a band 6 10 ...
Page 379: ...3 Inverter cover Enlarged picture 6 11 Special Instructions of Wiring ...
Page 381: ......