Mitsubishi Electric MSZ-HM09NA-U1 Service Manual page 35

OPERATING PROCEDURE
2. Removing the indoor power P.C. board and the
electrical box
(1) Remove the panel. (Refer to 1.) Remove the right cor-
ner box.
(2) Disconnect the following connectors:
<Indoor electronic control P.C. board>
CN151 (Vane motor)
CN112 (Indoor coil thermistor)
CN10A (To the indoor power P.C. board)
(3) Unhook the catch on the left side of the control P.C.
board holder. Pull the control P.C. board holder as if
opening the door at 90 degrees. Remove the control P.C.
board holder from the axial rod on the electrical box.
(4) Remove the screw of the V.A. clamp.
(5) Remove the V.A. clamp and the indoor/outdoor con-
necting wire.
(6) Remove the screw of the conduit cover and the conduit
cover.
(7) Remove the screw of the conduit plate and the conduit
plate.
(8) Remove the screw fixing the electrical box.
(9) Remove the screws of the ground plate. (Photo 2)
(10) Remove the indoor coil thermistor from the water
cover.
(11) Disengage the hooks of the water cover and remove
the water cover.
(12) Remove the screw of the electrical cover and remove
the electrical cover.
(13) Disconnect the CN211 (Indoor fan motor) from the
indoor power P.C. board.
(14) Remove the upper catch of the electrical box, and pull
out the electrical box.
To attach the electrical box, pass the wires connecting
the indoor power P.C. board and the indoor electronic
control P.C. board through A. Pass the lead wires of the
fan motor through B as shown in the Photo 3.
(15) Disconnect the following connectors.
<Indoor power P.C. board>
CN201 (Terminal block)
CN20A (To the indoor electronic control P.C. board)
Photo 4
OBH746B
Photo 2
Screws of
the ground plate
Indoor electronic
control P.C. board
Photo 3
Screw of
the conduit
plate
35
PHOTOS
Water cover
Screw of the
electrical cover
Screw of the
V.A. clamp
Indoor coil ther-
mistor
Indoor coil ther-
mistor connec-
tor CN112
Connector
CN10A
(To indoor power
P.C. board)
Control P.C. board holder
Vane motor
connector (CN151)
Terminal block
connector CN201
Connector CN20A
(To indoor elec-
tronic P.C. board)
Indoor fan motor
connector CN211
Electrical box
Screw of the
electrical box
Screw of the
conduit cover