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5-8 Replacement of Control Circuit Board
5-8-1 Removal of Control Box
1. Disconnect power and remove grille.
2. Be sure to ground any static electric charge in your
body and never touch the control circuit.
3. Disconnect the connectors from the control circuit
board.
4. Remove a screw securing the control box assembly.
5-8-2 Removal of P.C.B Assembly
1. Pull the lever end of the plastic fastener and remove
the Flexible Printed Circuit(FPC) of membrane panel.
2. Remove screws (3) securing the control circuit board.
3. Lift up the control circuit board from the Ass’y control
box.
4. When reconnecting the FPC connector, make sure
that the holes on the connector are properly engaged
with the hooks on the Plastic Fastener.
5-8-3 Removal of Window Display & Membrane Panel
1. Window display should not be disassembled as its
mounting tabs will be broken. If repair work is difficult,
replace with Ass’y control panel.
2. The membrane key board is attached to the
escutcheon base with double faced adhesive tape.
Therefore, applying hot air such as using of hair dryer
is recommended for smoother removal.
3. When installing new membrane key board, make
sure that the surface of escutcheon base is cleaned
sufficiently so that any problems (shorted contacts or
uneven surface) can be avoided.
