Toshiba libretto U100 Maintenance Manual page 92

2 Troubleshooting Procedures
Procedure 2 Connector Check and Replacement Check
The Modem is installed as a modem daughter card (MDC). If the modem malfunctions, the
MDC, SD board (FLVSD*), 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 following connections are secure.
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 Modem cable 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 3.
Check 3 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 4.
Check 4 The SD board 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 5.
Check 5 The System board may be defective or damaged. Replace the System Board with
a new one following the steps in Chapter 4, Replacement Procedures.
2-48 [CONFIDENTIAL]
2.10 Modem Troubleshooting
libretto U100 Maintenance Manual (960-520)