Toshiba 650CT Maintenance Manual page 38

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.
1. System test
2. Memory test
3. Printer test
4. ASYNC test
5. Real Timer test
6. NDP test
7. Expansion test
8. Sound test
9. Modem test
If an error is detected during any of these tests, go to Procedure 5.
Procedure 5 Replacement Check
The system board or other PCB may be damaged. Disassemble the computer following the
steps described in Chapter 4, Replacement Procedures, and perform the following checks.
If the System, Memory, Printer, Async, Real Timer, NDP, Expansion, Sound, or
Modem diagnostic test detects an error, go to Check 1.
Check 1 Visually examine the system board PJ13 connector and the I/O board PJ5 connec-
tor.
• Are the pins inserted evenly? If a connection is off center or not even, it could
cause a gap or break in the connection housing.
• Are any pins broken or bent?
Check 2 Replace the I/O board with a new one. If the problem still exists, go to Check 3.
Check 3 Replace the system board with a new one.
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650CT