Mitsubishi Electric CITY MULTY PKFY Series Technical & Service Manual page 27

OPERATION PROCEDURE OPERATION PROCEDURE
3. Removing the indoor controller board and indoor power
board
(1) Remove the front panel. (Refer to procedure 2)
(2) Remove the electrical box cover (screw 4 × 10).
(See Photo 2)
INDOOR CONTROLLER BOARD
(1) Disconnect the following connectors from the indoor
controller board.
CN60, CN5V, CN90, CN29, CN21
CN42, CN81, CN3A, CN20
(2) Pull out the indoor controller board toward you, then
disconnect the rest of connectors.
CN53M, CN35M (See Photo 3)
INDOOR POWER BOARD
(1) Disconnect the following connectors on the indoor power
board.
FAN, CN53P, CN35P, CN2M, CND
(2) Remove the earth wire for TAB1.
(3) Pull out the indoor power board toward you.
(See Photo 3)
4. Removing the electrical box
(1) Remove the front panel. (Refer to procedure 2)
(2) Remove the electrical box cover. (See Photo 2)
(3) Pull the nozzle assembly toward you as opening the catch
of the nozzle assembly. (See Photo 5)
(4) Disconnect the indoor/outdoor transmission wiring of TB5.
(5) Disconnect the power supply wiring of TB2.
(6) Disconnect the relay connector of MA-remote controller.
(7) Disconnect the following connector on the indoor controller
board.
CN60, CN5V, CN29, CN21, CN90, (CN3A)
(8) Disconnect the connector (FAN) on the indoor power board.
(9) Remove the ground wire fixing screw.
(10) Pull the disconnected lead wire out from the electrical box.
(11) Push up the upper fixture catch to remove the box, then
pull the lower fixture and remove it from the box fixture.
OCH418E
Photo 2
Photo 3
Water cut
fixing screw
Water cut
Terminal block (TB2)
Photo 4
Ground wire set screw
Pipe tempera-
ture detection
thermistor/liquid
(TH22)
Pipe tempera-
ture detection
thermistor/gas
(TH23)
27 27
PHOTOS
Electrical box cover
Electrical box
Indoor controller board
Linear expansion valve
Indoor controller board
Screw
Indoor power
board
Terminal block
(TB5)
Room tempera-
ture thermistor
cover
Indoor power
board
MA-remote
controller
connector
Terminal block
(TB5)
Terminal block
(TB2)