40
ADCC0200 and ADCC0300
Appendix C: 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
(ADCC0300 only)
✗ Display not visible
✗ Keyboard speaker not audible
✗ Cannot access main menus of CPU
(ADCC0300 only)
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 if Program Lock mode is on. Program Lock
mode passcode is required to perform program-
ming 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
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