Toshiba Satellite U840 Maintenance Manual page 44

Check 2 USB FDD may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Check 3 Connect USB FDD to each port embedded on system board.
If it does not work properly when connected to USB board CN3, CN4, perform
Check 4. If it does not work properly when connected to System board CN7 and
USB board CN3, CN4, perform Check 5.
Check 4 USB board may be faulty. Replace it with a new one following the steps in
Chapter 4, Replacement Procedures.
Check 5 System board may be faulty. Replace it with a new one following the steps in
Chapter 4, Replacement Procedures.
Satellite U840 Maintenance Manual (960-Q08)
2 Troubleshooting Procedures
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