2.4 System board Troubleshooting
Procedure 2
Debug Port Check
Check the D port status by a debug port test. The tool for debug port test is shown below.
The test procedures are follows:
1. Connect the debug test cable to the connector CN3400 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.
RS-232C cross-cable
PC that displays
the test results
4. Boot the computer in MS-DOS mode.
PORTEGE R200 Maintenance Manual (960-519)
Figure 2-2 A set of tool for debug port test
Debug port test cable
Test board
2 Troubleshooting
CN3400 System board
[CONFIDENTIAL]
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