Duerkopp Adler 550-767 Operating Instructions Manual page 44

"Print DB" field
When this function is activated the seam database is printed out (only
if a printer is connected and activated in the setup).
"Display DB" field
When this function is activated the seam database is opened and all
seam parameters are displayed.
"Bobbins" field
All registered bobbins are displayed when this function is activated.
Selected bobbins can be deleted using the "Delete" field.
"DB needle" field
If the component "Needle-check" is activated in the set-up, the user will
be asked at certain times to check the needle and, if necessary,
replace it.
These activities will be recorded in the needle-change database.
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