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2.4 System board Troubleshooting 2 Troubleshooting
Procedure 2 Debug Port Check on Boot Mode
Check the D port status by a debug port test. The tool for debug port test is shown below.
Figure 2-3 A set of tool for debug port test
The test procedures are follows;
1. Connect the debug test cable to the connector PJ325 of the System board. For
disassembling to connect the test cable, refer to Chapter 4.
2. Connect the debug port test cable and RS-232C cross-cable to the test board.
3. Connect the RS-232C cross-cable to the PC that displays the results.
RS232C cross-cable Debu
g
p
ort test cable
PJ325 System board
Test board
PC that displays
the test results
4. Boot the computer in MS-DOS mode.
PORTEGE R100 Maintenance Manual (960-440) 2-19