Troubleshooting Procedures    
2-48 [CONFIDENTIAL] TECRA A11/S11/P11/Satellite Pro S500 Series Maintenance Manual (960-784) 
Check 2  Modem cable or MDC cable may be faulty. Replace it with a new one. If the 
problem still occurs, perform Check 3. 
Check 3  MDC may be faulty. Replace it with a new one following the steps in Chapter 4, 
Replacement Procedure. If the problem still occurs, perform Check 4. 
Check 4  System board may be faulty. Replace it with a new one following the instructions 
in Chapter 4, Replacement Procedures.