Toshiba Tecra M5 Maintenance Manual page 103

2.10 Modem Troubleshooting
Procedure 2 Connector Check and Replacement Check
The Modem is installed as a MDC (Modem Daughter Card). If the modem malfunctions,
there may be a bad connection between the MDC and the system board. Or the MDC, system
board or their connectors might be damaged.
Disassemble the computer following the steps described in Chapter 4, Replacement
Procedures and perform the following checks:
Check 1 Make sure the MDC is firmly connected to CN3010 on the system board, and the
MDC cable is connected to CN3011 on the system board and the connector of the
MDC.
If a connector is disconnected, connect it firmly and repeat Procedure 1. If the
modem is still not functioning properly, perform Check 2.
Check 2 The MDC may be defective or damaged. Replace it with a new one following the
steps in Chapter 4, Replacement Procedures. If the modem is still not functioning
properly, perform Check 3.
Check 3 The modem jack or MDC cable may be defective or damaged. Replace it with a
new one following the steps in Chapter 4, Replacement Procedures. If the modem
is still not functioning properly, perform Check 4.
Check 4 The system board may be defective or damaged. Replace it with a new one
following the steps in Chapter 4, Replacement Procedures.
TECRA M5 Maintenance Manual (960-542)
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-49