5 - 10
Failure Investigation for Electronic Parts
Cannot sew button holes well.
Cannot sew button holes
well
When the BH lever is lowered, is the
resistance across pins 1-2 and pins 2-3
on the BH switch connector normal?
•
BH lever pulled forward
Pins 1-2 ... 1Ω or less, pins 2-3 ... ∞
•
BH lever pushed back
Pins 1-2 ... ∞, pins 2-3 ... 1Ω or less
Is the resistance between pins 4-5 on
the BH switch lever connector normal?
•
BH lever down ... 1Ω or less
•
BH lever up ... ∞
Switch to the correct presser
foot
N
Replace main PCB assy.
Y
Is the proper presser foot being used?
N
N
Y
Y
• Adjust the BH lever
or
• Replace the BH switch assy.
• Adjust the BH lever
or
• Replace the BH switch assy.
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