2.7 Keyboard Troubleshooting
To determine
if
the T1900tr1900C's keyboard is functioning properly, perform the following
procedures.
Start with Procedure 1 and continue with the other procedures as instructed.
Procedure
1:
Diagnostic Test Program Execution Check
Procedure
2:
Connector and Replacement Check
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 upper system board by a 19-pin flat cable. This cable may
be disconnected
or
damaged. Disassemble the T1900tr1900C 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
PJ4
Upper
System
Board
If
this cable is damaged, replace the keyboard with a new one.
If
the cable is
disconnected, firmly reconnect it, then perfonn Procedure 1 again.
If
the keyboard
is still not functioning properly, perfonn Check
2.
Check 2 The keyboard controller on the system board may be damaged. Replace the upper
system board. Refer
to
Chapter 4, Replacement Procedures for more information
about how
to
replace the upper system board.
2-23
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