Cannot Sew Button Holes Well - Baby Lock BLMY Service Manual

Failure Investigation for Electronic Parts Cannot sew button holes well
Is the resistance between BH lever
switch connector pins 4 & 5 normal?
• BH lever down ...... 1Ω or less
• BH lever up .......... ∞
With the BH lever down, are the
resistance values between BH switch
connector pins 1 & 2 and pins 2 & 3
normal?
• BH lever pulled forward
• BH lever pushed back
5 - 10

Cannot sew button holes well

Is the correct presser being used?
Y
Y
Pins 1 - 2...1 Ω or less, pins 2 - 3...∞
Pins 1 - 2...∞, pins 2 - 3...1 Ω or less
Y
Replace main NF3D PCB assy.
N
Change to correct presser
• Adjust BH lever
N
or
• Replace BH switch assy.
• Adjust BH lever
N
or
• Replace BH switch assy.