Mitsubishi Electric MFZ-KA25VA Service Manual page 36

OPERATING PROCEDURE
2. Removing the electronic control P.C. board and the
display receiver P.C. board
(1) Remove the panel. (Refer to 1.)
(2) Remove the screw of the electrical cover, and then the
electrical cover. (See Photo 3.)
(3) Remove the screw of the ground wires under the electrical
box, and then the ground wires. (See Photo 4.)
(4) Remove the screw of the ground wires connected to the
indoor fan motor (lower), and then the ground wires. (See
Photo 4.)
(5) Remove the screw of the ground wires connected to the
indoor heat exchanger, and then the ground wires. (See
Photo 4.)
(6) Unhook the lamp cover from the catch. (See Photo 4.)
(7) Open the lamp cover and pull out the display receiver P.C.
board.
(8) Remove the screw of the ground wires connected to the
electronic control P.C. board, and then the ground wires.
(See Photo 4.)
(9) Pull the electronic control P.C. board slightly toward you
from the electrical box, and disconnect all the connectors
on the electronic control P.C. board.
( 10 ) Pull out the electronic control P.C. board from the
electrical box.
3. Removing the electrical box
(1) Remove the panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Remove the ground wires from the electrical box. (Refer to
2.)
(4) Remove the ground wires connected to the indoor fan
motor and the ones connected to the indoor heat
exchanger. (Refer to 2.)
(5) Remove the screw of the electrical box. (See Photo 4.)
(6) Disconnect the following connectors on the electronic
control P.C. board.(See Photo 5.)
•Fan motor connectors < CN211, CN212 >
•Horizontal vane motor connector < CN151 >
•Damper motor connector < CN152 >
•Display receiver P.C. board connectors < CN106,
CN125 >
•Indoor coil thermistor connectors < CN112, CN113 >
•Room temperature thermistor connector < CN111 >
•Damper limit switch connectors < CN1X1, CN1Y1 >
(7) Unhook the electrical box from the upper catch and pull out
the electrical box from the box.
Photo 3
Photo 4
Photo 5
36
PHOTOS
Screw of the
electrical cover
Lamp cover
Screw of the
ground wires
Screw of the
electrical box
Indoor coil thermistor
connector CN113
Display receiver P.C.
board connector
CN106
Display receiver P.C.
board connector
CN125
Horizontal vane
motor connector
CN151
Damper motor
connector CN152
Fan motor
connector CN211
Fan motor
connector CN212