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2 Troubleshooting Procedures
Procedure 2 Debugging Port Check (Boot Mode)
Check the D port status by a serial port test. The tool for serial port test is shown below.
Figure 2-2 Debug port (Boot mode) error status
The test procedures are follows:
1. Make "W3400" of system board short-circuited with a wire. As for the position of
W3400, refer to Chapter 4 and Appendix B.
2. Connect the debug port test cable to the connector CN3400 of the system board. For
disassembling to connect the test cable, refer to Chapter 4.
3. Connect the debug port test cable and RS-232C cross-cable to the test board.
4. Connect the RS-232C Cross-cable to the PC that displays the test results.
PORTEGE M700/M750 Maintenance Manual (960-661) [CONFIDENTIAL] 2-19