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2.7
Keyboard Troubleshooting
To determine if the computer's keyboard is functioning properly, perform the following
procedures. Start with Procedure 1 and continue with the other procedure 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 Diag-
nostics, 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 two flat cables. The membrane switch is
connected to the I/O board by a flat cable. These cables or connectors may be disconnected or
damaged. If there is a problem with the keyboard or AccuPoint, disassemble the computer as
described in Chapter 4, Replacement Procedures, and perform Check 1. If there is a problem
with the membrane switch, perform Check 4.
NOTE: In the following checks, refer to the appropriate section in Chapter 4 for
replacement procedures.
Check 1
Make sure the following cables are not damaged and are connected to the system
board.
Keyboard
If the cables are damaged, replace the keyboard with a new one. If the cable is
disconnected, firmly connect it. Perform Procedure 1 again. If the error still
exists, perform Check 2.
Check 2
The system board may be damaged. Replace the system board with a new one. If
the error still exists, perform Check 3.
Check 3
The I/O board may be damaged. Replace the I/O board with a new one.
Check 4
The membrane switch may be damaged. Replace the membrane switch with a
new one. If the error still exists, perform Check 5.
650CT
Diagnostic Test Program Execution Check
Connector and Replacement Check
PJ14
System board
PJ18
PJ15
PJ5 I/O board PJ6
Membrane
switch
2-29
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Table of Contents
Troubleshooting
