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Allow the keyboard assembly to fall forward from the front panel. Separate the
6
elastomeric keypad and keyboard panel from the PC board.
Using a paper clip or screwdriver, short the PC board trace of the non-operating key
7
and look for an appropriate response on the display.
If the display responds as though the key was pressed, replace the elastomeric
8
keypad.
If the display does not respond as though the key was pressed, replace the keyboard.
Check the RPG connector.
9
The RPG connector has a TTL pulse on pins 22 and 24 when you turn the knob. Pin 20 of the
connector is +5 V.
Troubleshooting
To test the keyboard signals
5–23
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