NCR 7448 Hardware User's Manual page 107

3. Press 3 to select the TONE test
4. Press 1 to start the TONE test
Note: Once the test starts it's impossible to change the volume or to exit the
TONE test. You need to press 1 to cancel the TONE test
5. Press 1 to cancel the TONE test, if needed
6. Press 0 to stop the test
The NCR 7448 Workstation exits the TONE test and returns to the
TERMINAL Menu
Chapter 4: Setup 4-35