Procedure 1 Fdd Head Cleaning Check - Toshiba T4500 User Manual

2.5 Floppy Disk Drive Troubleshooting
This section describes how to determine if the T4500/T4600 Family's internal 3.5-inch floppy disk
drive is functioning properly. Perform the steps below starting with Procedure 1 and continuing
with the other procedures as required.
Procedure 1: FDD Head Cleaning Check
Procedure 2: External 5.25-inch FDD Check (T4500 or T4500C only)
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 operation is 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 still does not function properly, go to Procedure 3.
If the test program cannot be executed on the T4500 series, go to Procedure 2. If the test program
cannot be executed on the T4600 series, go to Procedure 4.
Procedure 2 External 5.25-inch FDD Check (T4500 or T4500C only)
NOTE: The T4600 or T4600C (T4600 series) does not support an external FDD. Therefore,
all references to an external FDD (3.5-inch or 5.25-inch) relate to the T4500 or T4500C
(T4500 series) computer.
The floppy disk controller on the computer's system board controls the internal and external FDD.
To determine if either the system board or the internal FDD is defective, check the following
items:
Check 1 Connect the external 5.25-inch FDD to the PRT/FDD port and make sure it functions
properly. If it does, perform Procedure 4. If it doesn't, perform Check 2.
NOTE: To use the external 5.25-inch FDD, set the external FDD/PRT option in the SETUP
program to FDD A or FDD B.
Check 2 Replace the System PCB with a new one following the steps in Chapter 4, Replace-
ment Procedures.
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