Main Motor Does Not Turn - Brother NX600 Service Manual

Failure Investigation for Electronic Parts Main motor does not turn
Is the main motor connector correctly
connected to CN301 of power supply
unit F?
Is the main motor resistance 1.5 – 3.5 Ω?
Are the resistance values for the
Stop/Start switch, reverse switch,
raise needle switch and the thread
cut switch normal?
• Switch resistance values
Switch depressed ... 1 Ω or less
Switch out ............. ∞

Main motor does not turn

Does the pulley turn easily?
Y
Y
Y
Y
To next page
N
Adjust the assembly of upper
shaft
N
Reconnect it correctly
N
Replace main motor
N
Replace SS-VR F2 PCB assy.
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