User Guide

2 Troubleshooting Procedures 2.11 Modem 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 in the Diagnostic Program. Refer to Chapter 3, Tests and
Diagnostics for more information on how to perform the test program.
If any error is detected, perform Procedure 2.
Procedure 2 Connector Check and Replacement Check
An MDC (Modem Daughter Card) is used as the modem for this computer. The MDC is
connected to the system board by connector. If the modem malfunctions, these connections
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 has been firmly connected to the PJ3020 on the system
board and the modem jack cable has been firmly connected to the JP1 on the
modem.
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 Modem jack may be faulty. Replace it with a new one. If the modem
function is still not working properly, perform Check 3.
Check 3 The MDC may be faulty. Replace it with a new one following the steps in
Chapter 4. If the modem function is still not 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
2-44 Satellite A50/TECRA A2 Maintenance Manual (960-478)