Duerkopp Adler 550-767 Operating Instructions Manual page 62

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Enter the bobbin number (engraved on the bobbin).
Logging onto the system
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The operator logs on by wiping his bar code card through the
magnetic-card reader.
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The operator can also log on manually as follows:
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Press the "Access" field.
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Press the "Log on" field.
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Enter name and password.
Sewing can only begin if the system start and scanning of the
needle-thread cone, hook-thread cone and bobbin were faultless.
Failing this the system is not ready for sewing, and an error message
will be displayed.