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Troubleshooting Procedures
2.4.2 Procedure 2 Debugging Port Check
Check the D port status by a debug port test. The tool for debug port test is shown below.
Figure 2-1 A set of tool for debug port test
1. Not a Serial Port model should connect a debug port test cable to connector CN3110
of a system board.( W3270 open)
2. Connect the RS-232C Cross-cable to the PC that displays the test 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, execute Check 1.
2-26 [CONFIDENTIAL] PORTEGE M780 Maintenance Manual (960-809)