2.4 System Board Troubleshooting 2 Troubleshooting Procedures
Procedure 2 Serial Port Check (Boot Mode) Rev E
Check the D port status by a serial port test. The tool for serial port test is shown below.
Figure 2-2 A set of tool for serial port test
The test procedures are follows:
1. Make "W3270" of Swich board is made to short-circuit with a wire. As for
theposition of W3270 is refer to Appendix B.
2. Connect the RS-232C cross-cable to the connector CN3420 of the system board..
3. Connect the RS-232C Cross-cable to the PC that displays the test results.
4. Boot the compute1r in DOS mode.
TECRA M9 Maintenance Manual (960-631) [CONFIDENTIAL] 2-19
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