Mitsubishi Electric MSZ-EF18NAW-U1 Service Manual page 32

OPERATING PROCEDURE
2. Remove the indoor electrical box
(1) Remove the panel (Refer to section 1.) and the cor-
ner box right.
(2) Remove the screw of the V.A. clamp.
Remove the V.A. clamp and the indoor/outdoor
connecting wire.
(3) Remove the ground wire connected to the indoor heat
exchanger from the electrical box.
(4) Remove the screw of the electrical cover and remove
the electrical cover.
(5) Disconnect following connectors:
<Indoor electronic control P.C. board>
CN151 (Vane motor)
<Indoor power P.C. board>
CN211 (Indoor fan motor)
(6) Remove the screw fixing the electrical box, then
the upper catch of the electrical box, and
pull out the electrical box.
3. Removing the indoor power P.C. board, the
switch board, the display board, the receiver
board and the indoor electronic control P.C.
board
(1) Remove the panel (Refer to section 1.) and the corner
box right.
(2) Remove the screw of the V.A. clamp. Remove the
V.A. clamp and the indoor/outdoor connecting wire.
(3) Remove the screw of the conduit cover and the con-
duit cover. (Photo 3)
(4) Remove the screw of the conduit plate and the con-
duit plate. (Photo 4)
(5) Remove the screw fixing the electrical box.
(6) Remove the indoor electrical box (Refer to section 2.).
(7) Remove the ground wire connected to the electrical
box from the indoor power P.C. board.
(8) Disconnect the following connectors:
<Indoor electronic power P.C. board>
CN201 (Terminal block)
CN202 (To the indoor electronic control P.C. board)
(9) Remove the indoor power P.C. board.
(10) Disconnect the following connectors:
<Indoor electronic control P.C. board>
CN111 (Room temperature thermistor)
CN112 (Indoor coil thermistor)
(11) Unhook the catches of the display P.C. board holder
from the nozzle and the electrical box (right side).
(12) Open the rear cover of the display P.C. board holder
and remove the switch board, the display board and
the receiver board.
Remove the indoor electronic control P.C. board.
OBH736C
PHOTOS/FIGURES
Photo 2
Ground wire
Catch of indoor electronic
control P.C. board holder
Photo 3
Ground wire
Screw of the
terminal block
Catch of indoor electronic
control P.C. board holder
Photo 4
32
Electrical box
Screw of
the electrical cover
Screw of
the V.A. clamp
Display P.C. board
holder
Upper catch
Indoor power
P.C. board
Indoor electronic
control P.C. board
Screw of
the electrical box
Screw of
the conduit cover
Screw of
the conduit plate