Cannot Sew Button Hole Correctly - Brother XR9000 Service Manual

Failure Investigation
for Electronic Parts
Is the resistance between pins 4 &
5 on the BH switch connector
normal?
• BH lever down : 1Ω or less
• BH lever up : more than 1MΩ
When the BH lever is lowered, is the resistance
between pins 1 & 2 and 2 & 3 on the BH switch
connector normal?
• BH lever pulled forward
• BH lever pushed back
5 - 10

Cannot sew button hole correctly

Cannot sew button hole correctly.
Is the appropriate presser foot
being used?
Y
Y
Pins 1-2 : 1Ω or less, pins 2-3 : more than 1MΩ
Pins 1-2 : more than 1MΩ, pins 2-3 : 1Ω or less
Y
Replace main PCB assy.
N
Attach the appropriate
presser foot.
• Adjust the BH lever.
N
or
• Replace the BH switch assy.
• Adjust the BH lever.
N
or
• Replace the BH switch assy.