Toshiba QOSMIO F20 Maintenance Manual page 71

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 on 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.
4. Boot the computer in MS-DOS mode.
5. Execute GETDPORT.COM in the text menu in CPU REAL mode. (Insert the FD for
starting D port into FDD and input "FD starting drive:>dport ".)
The D port status is displayed in the following form;
6. When the D port status is FFFFh (normal status), go to Procedure 4.
7. When the D port status falls into any status in Table 2-4 except FFFFh, execute Check
1.
QOSMIO F20 Maintenance Manual (960-526)
Figure 2-2 A set of tool for debug port test
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-19