Brother NS-10 - Problems with vertical needle movement and reverse stitching

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Failure Investigation for Electronic Parts Problems with vertical needle movement and reverse stitching
Problems with vertical needle movement
and reverse stitching
Replace the SS-VR PCB assy.
Reconnect it correctly
Is the BW switch assy. OFF?
Is the connector of the SS-VR PCB
assy. correctly connected to CN1 of
the main PCB assy.?
Are the resistance values for the
Stop/start switch, reverse switch, and
raise needle switch normal?
• Switch resistance values
Switch pressed …… 1 Ω or less
Switch released …… ∞
N
N
N
Adjust the assembly of the
BW switch assy.
Y
Y
Y
Replace the main PCB assy.