Toshiba A1 User Manual

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 

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.  

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 PJ3000 on the system board 

and the modem jack cable has been firmly connected to the JP1 on the modem. 

JP1           JP2

Modem Jack

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 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