Brother S-7180A Instruction Manual page 20

3. Operation panel
Icon Function
Lights when the sewing pattern is continuous backtack sewing.
Lights up when the sewing pattern consists of up to 15 steps.
Lights up when the sewing pattern is a step sewing consisting of 4 steps.
Lights up when the sewing pattern is a step sewing consisting of 7 steps.
Lights up when the sewing pattern consists of 8 steps.
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S-7180A