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2 Troubleshooting Procedures
NB250/NB255 Series Maintenance Manual
19
2.5 External USB Devices Troubleshooting
Replace system board
(Procedure 2)
END
Original USB
device is faulty
Perform external device and
connection check
(Procedure 1)
START
Does the device function
when connected to a
different USB port?
Does an alternative USB
device function correctly?
No
Yes
No
Check USB
port
connection
Yes
Figure 2-5 External USB device troubleshooting process