Stitch Length And Zigzag Width Cannot Be Done By Manual Adjustment - Baby Lock BLMY Service Manual

Failure Investigation for Electronic Parts
Stitch length and zigzag width
cannot be done by manual
adjustment.
Does the LCD panel display change
when the manual key for stitch length
and the manual key for zigzag width
are turned ON and OFF normally?
Is the resistance between pins 1 & 2
and pins 3 & 4 on the Z pulse motor
and F pulse motor connectors 4 – 6 Ω?
Replace main NF3D PCB assy.
Stitch length and zigzag width cannot be
done by manual adjustment
Y
Y
• Replace rubber keys
N
or
• Replace operation U22 PCB
assy.
N
Replace pulse motor
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