Toshiba PORTEGE M400 - Manual (Page 93)

2.11 Modem Troubleshooting 2 Troubleshooting
2.11 Modem Troubleshooting
To check if the modem is defective or malfunctioning, follow the troubleshooting procedures
below as instructed.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute the Modem test program available as part of the maintenance test program. This
program checks the modem. See Chapter 3 for information on how to perform the test.
If any error is detected by the test, go to Procedure 2.
Procedure 2 Connector Check and Replacement Check
The Modem jack (RJ11) is mounted on the System board and MDC is connected to the
System board. If the modem malfunctions, the connection may be bad or the MDC or System
board might be faulty.
Disassemble the computer following the steps described in Chapter 4 and perform the
following checks:
Check 1 Make sure the MDC is firmly connected to the CN3010 and the MDC cable is
connected to the CN4100 on the System board.
If any connector is disconnected, connect it firmly and return to Procedure 1. If
there is still an error, perform Check 2.
Check 2 The MDC may be faulty. Replace it with a new one following the steps in Chapter
4. If the modem is not still working properly, perform Check 3.
Check 3 The MDC cable may be faulty. Replace it with a new one following the steps in
Chapter 4. If the modem is not still working properly, perform Check 4.
Check 4 The System board may be faulty. Replace it with a new one following the
instructions in Chapter 4.
PORTEGE M400 Maintenance Manual (960-541) [CONFIDENTIAL] 2-45