Lower-Thread Sensor Position - Bernina B 590 Service And Maintenance Manual

5.14 Lower-thread sensor position

Check:
• Functional check in Service Program section 3 (see 3c)
Adjustment:
The position of the lower thread sensor is given and cannot be adjusted.
• Disassembly and refitting (see 4.2.9).
Note:
If the lower-thread indicator doesn't work flawlessly, check the state of the bobbin, especially the inner and
outer reflectors on the bobbin.
If the bobbin is in mint condition, replace the lower-thread sensor unit.
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