T3400/T3400CT Maintenance Manual
2.5 Floppy Disk Drive Troubleshooting
This section describes how to determine if the external 3.5-inch floppy disk drive is function-
ing properly. Perform the steps below starting with Procedure 1 and continue as required.
Procedure 1: FDD Head Cleaning Check
Procedure 2: External 5.25-inch FDD Check
Procedure 3: Diagnostic Test Program Check
Procedure 4: Connector Check and Replacement Check
Procedure 1 FDD Head Cleaning Check
FDD head cleaning is one option available in the Diagnostic Program. Detailed procedures
are given in Chapter 3, Tests and Diagnostics.
After loading Toshiba MS-DOS, run the Diagnostic Program and then clean the FDD heads
using the cleaning kit. If the FDD does not function properly after cleaning, go to Procedure
3.
If the test program in Procedure 3 cannot be executed, go to Procedure 2.
Procedure 2 External 5.25-inch FDD Check
The floppy disk controller on the computer system board controls the external 3.5-inch FDD
and external 5.25-inch FDD. To determine if the system board or external 3.5-inch FDD is
defective, check the following items:
Check 1 Connect the external 5.25-inch FDD to the PRT/FDD port and verify it functions
properly. If so, perform Procedure 4. If not, perform Check 2.
NOTE: To use the external 5.25-inch FDD, set the Ext. FDD/PRT option in
the SETUP program to FDD A or B.
Check 2 Replace the system board following the steps in Chapter 4, Replacement Proce-
dures. If the FDD is still not functioning properly, replace the external 3.5-inch
FDD unit.
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