Brother MFC-7340 - Manual (Page 31)

Printing
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„ Serial No. (2)
By clicking Auto Detect, the printer driver will probe the printer and display its serial number. If it fails to
receive the information, the screen will display "---------".
Note
The Auto Detect function is not available under the following printer conditions:
• The printer power switch is off.
• The printer is in an error state.
• The printer is in a network shared environment.
• The cable is not connected to the printer correctly.