Panasonic NN-A720MB, Manual

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Disconnecting the PCB lock connector
9.3. Digital Programmer Circuit (DPC) and membrane key board.
NOTE: Ground any static electric built up on your body before handling the DPC.
1. Disconnect all connectors from the DPC.
2. Remove the two screws holding the escutcheon base and slide
the escutcheon base upward slightly. removal is easier with the
door open.
3. Release the flat cable.
4. Remove the six screws holding the DPC DU assembly
5. Remove the door lever
6. Remove the seven screws holding the DPC AU assembly
To remove escutcheon pad
1. Remove the escutcheon bracket from the escutcheon base by
freeing the 4 catch hooks on the escutcheon base.
2. Peel away the display window from the inside of the base.
3. Remove the membrane assembly by pushing from the inside of
the base and then peeling away from the outside surface.
NOTE:
1. The escutcheon key board is attached to the escutcheon base
with double faced adhesive tape. Therefore, applying hot air such
as using a hair dryer is recommended for smoother removal
2. When installing a new escutcheon key board, make sure that the
surface of the escutcheon base is cleared sufficiently so that
problems such as, shorted contacts and uneven surfaces can be
avoided.
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