User guide

Troubleshooting
C4705-90000
8-53
  
        !#     %  
      "
   !       $      
SERVICE TESTS
32 Button test
  $ # #      #   %
       %    "   "  " 
#   %
Example: If the Cancel button is pressed, the message Cancel Pressed / Exit: Up & Down"
will be displayed on the frontĆpanel.
Press the Up and Down Arrow buttons simultaneously to stop the test.
If a button is pressed but is not shown on the front-panel display or is incorrect, then the test has
failed.
If the test fails, try replacing one of the following components:
1 FrontĆpanel assembly  page 6Ć18.
2 Main PCA  page 6Ć9.
Only replace one component at a time and perform the “Button” test again before replacing
another component. Using this procedure you will be able to determine exactly which component
failed.