Keyboard Troubleshooting - Toshiba T3400 Maintenance Manual

2.7

Keyboard Troubleshooting

To determine if the keyboard is functioning properly, perform the following procedures. Start
with Procedure 1 and continue as instructed.
Procedure 1:
Procedure 2:
Procedure 1 Diagnostic Test Program Execution Check
Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Tests and
Diagnostics, for more information on how to perform the test program.
If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning
properly.
Procedure 2 Connector and Replacement Check
The keyboard is connected to the system board by a 19-pin flat cable. This cable may be
disconnected or damaged. Disassemble the T3400/T3400CT as described in Chapter 4,
Replacement Procedures, and perform the following checks:
Check 1 Make sure the keyboard cable is not damaged and is connected to the system
board.
Keyboard cable
If this cable is damaged, replace the keyboard. If the cable is disconnected, firmly
re-attach it. Perform Procedure 1. If the keyboard is still not functioning prop-
erly, perform Check 2.
Check 2 The keyboard controller on the system board may be damaged. Replace the
system board. Refer to Chapter 4, Replacement Procedures, for more
information.
T3400/T3400CT Maintenance Manual
Diagnostic Test Program Execution Check
Connector and Replacement Check
System board
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