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Remove the case from the DU PWA.
Remove the original EPROMs and/or LCD module from the DU PWA.
Install the upgrade EPROMs and/or LCD module into the DU PWA.
Replace the DU case.
Replace the DU back into its mounting.
Run Test Mode and verify correct keypad operation.
Detailed instructions for some of the steps listed above are provided on the
following pages. Please review completely before proceeding.
7.3.2.1
Remove the Display Unit from its mounting.
Step 1. Disconnect the DU pigtail connector from its mating connector.