Problems With Vertical Needle Movement And Reverse Stitching - Brother XR9000 Service Manual

Failure Investigation
for Electronic Parts
Problems with vertical needle movement
and reverse stitching.
Is the resistance for the start / stop
switch, reverse stitch switch and
needle position button normal?
• Switch resistance values
Switch depressed : 1Ω or less
Switch out : more than 1MΩ
Replace the main PCB assy.

Problems with vertical needle movement and reverse stitching

Y
Is the BW switch OFF?
Y
N
Replace the SSVR PCB assy.
N
Reassemble the BW switch assy.
5 - 11