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4-6 Replacement of Control Circuit Board
4-6-1 Removal of Control Box
1. Be sure to ground any static electric charge in your
body and never touch the control circuit.
2. Disconnect the connectors from the control circuit
board.
3. Remove screws securing the control box assembly.
4. Remove the screw securing the ground tail of the
keyboard.
CONTROL-BOX
SCREWS
SCREWS
ASSY PCB
Membrane
Panel
4-6-2 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 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.
CONTROL-BOX
SCREWS
SCREWS
ASSY PCB
Membrane
Panel
4-6-3 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.
CONTROL-BOX
SCREWS
SCREWS
ASSY PCB
Membrane
Panel
