Procedure 4
Diagnostic
Test
Program
Execution
Check
Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, Tests
and
Diagnostics, for more information
on
how
to
perform these tests.
l.
System Test
2.
Memory Test
3.
Printer Test
4.
ASYNC Test
If
an error is detected during these tests, go to Procedure
5.
ProcedureS
System
Board
Replacement
Check
The upper (FATSU*)
or
lower (FATSL*) system board may be damaged. (Note that the
power supply is mounted on the FATSL
*.) Refer to the T1900IT1900C parts catalog for a
breakdown
of
the computer's system boards.
Disassemble the
T1900IT1900C following the steps described in Chapter 4, Replacement
Procedures,
then perform the following checks.
NOTE:
To
determine whether to
first
replace the FA TSU*
or
the FATSL * during the
troubleshooting procedures:
1.
Check the
e"or
status
on
the printer
port
LED
and
locate the status
in
Table 2-2
or
2-3.
2.
Compare the
e"or
status with the tables
in
Appendix B.
a
If
the
e"or
is
related to
an
IC
or
connector listed
in
Table B-1
or
B-2, replace
the FA
TSU* (upper system board) first.
a
If
the
e"or
is
related to
an
IC
or
connector listed
in
Table
B-3
or
B-4, re-
place the FA TSL
* (lower system board) first.
As
an
example,
if
the
e"or
status indicates a keyboard (KBC) problem, replace the
FATSU* since the keyboard controller (lC15)
is
located
on
the upper system board, then
continue with the troubleshooting procedures. However,
if
the
e"or
indicates a
PCMCIA problem, replace the FATSL
*
first
since the PCMCIA Gate
A"ay
(lC203) is
located
on
the lower system
board
Check 1 Replace the upper
or
lower system board.
Check 2 Ifnormal operation is restored after replacing the upper (or lower) system board,
the original board is probably defective.
Check 3
If
normal operation is not restored, replace the original system board, then swap
out the remaining system board with a new one.
Check 4
If
normal operation is still not restored, either both system boards
or
another FRU
is
probably defective. The defective unit must be isolated by performing the
T1900IT1900C Diagnostics Program.
2-15
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