2.5 USB 3.5” FDD Troubleshooting 2 Troubleshooting
Procedure 3 Connector Check and Replacement Check
The USB FDD connector may be disconnected from the connector on the System board.
Check visually that the connector is connected firmly.
Check 1 Make sure the USB FDD cable is firmly connected to the CN4611 (port 3) or
CN4610 (port 0) of the System board, or CN4620 (port 5) of the CN board.
If the connection is loose, reconnect firmly and repeat Procedure 2. If there is still
an error, go to Check 2.
Check 2 The USB FDD may be defective or damaged. Replace it with a new one. If the
FDD is still not functioning properly, perform Check 3 when the USB FDD is
connected to CN4620 (port 5) or Check 5 when the USB FDD is connected to
CN4611/CN4610 (port 3/0).
Check 3 The connection between the CN board and the System board may be loose.
Reconnect the cable between them firmly. If the FDD is still not functioning
properly, perform Check 4.
Check 4 The CN board may be defective or damaged. Replace it with a new one. If the
FDD is still not functioning properly, perform Check 5.
Check 5 Replace the System board with a new one following the steps in Chapter 4,
Replacement Procedures.
TECRA M4 Maintenance Manual (960-521) [CONFIDENTIAL] 2-35