+---+
|001|
+---+
- Power-off the computer.
- Ensure that the modem is installed correctly.
- Ensure that the public switch telephone network (PSTN) cable and the data access
arrangement (DAA) cable, if installed, are connected correctly
If you need to correct one of the above conditions, do so now, then continue.
- Power-on the computer.
- Insert the IBM Data/FAX Modem diskette into the default diskette drive.
- If you are servicing a High Speed Internal Data/Fax Modem (Models FC3632 and FC3650),
at the DOS prompt (for example, A:\), type ESTDIAG, then press Enter.
- Follow the instructions on the screen. (If you need help, press F1)
DID the DIAGNOSTIC TESTS DETECT AN ERROR ?
+---+
Yes No-+002| The diagnostic test have completed successfully.
| +---+ If you suspect a problem, go to Step 004.
+-+-+
|003|
+---+
Go to 'Symptom-to-FRU Index (AT Bus)'.
+---+
|004|
+---+
- Check the PSTN cable and the DAA cable, if installed
for continuity
IS the CABLE(S) GOOD ?
+---+
Yes No-+005| Replace the defective cable(s).
+---+ +---+
|006|
+---+
- Have the customer transmit a call.
WAS the CALL TRANSMITTED SUCCESSSFULLY ?
+---+
Yes No-+007| If installed, replace the external DAA. If you do not
| +---+ have an external DAA installed, or replacing the
| external DAA does not correct the problem, replace
+-+-+ the modem.
|008|
+---+
- Have the customer receive an incoming call on the modem.
WAS the INCOMING CALL RECEIVED ?
+---+
Yes No-+009| If installed, replace the external DAA. If you do not
| +---+ have an external DAA installed, or replacing the
| external DAA does not correct the problem, replace
+-+-+ the modem.
|010|
+---+
The diagnostic tests have been completed successfully. If you still suspect a problem
that is not software related, replace the external DAA, then replace the modem.
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.