48
ADCC1100
Appendix D: Troubleshooting
Problem
✗No power to keyboard
✗No response to keystrokes (power
verified)
✗Keyboard responds to keystrokes on
some, but not all keys
✗Cannot perform menu programming
✗Display not visible
✗Keyboard speaker not audible
✗Cannot access main menus of CPU
Check List
✓Check AC outlet
✓Check wall transformer connections
✓Check cable connections to keyboard and
keyboard matrix interface
✓Measure transformer output at keyboard matrix
interface
✓Check connection of keyboard matrix interface to
system controller's communication port
✓ Check baud rates for keyboard and system
controller
✓Verify VCR/Monitor status
✓Verify smart card privileges. Administrator or
supervisor privileges are required to perform
programming functions.
✓Verify display brightness and contrast level
✓Verify speaker enabled in keyboard menu
✓Verify that keyboard is in program mode
✓Verify that correct monitor is selected for menu
programming
✓Verify CPU program monitor output is connected