Mitsubishi Electric PLA-SM71EA2 Service Manual page 36

OPERATING PROCEDURE
4. Removing the room temperature thermistor (TH1)
(1) Remove the electrical box cover. (See Photo 1 and 2)
(2) Disconnect the connector CN20 (Red) from the indoor
controller board.
(3) Remove the room temperature thermistor with its holder.
(See Photo 4)
5. Removing the indoor controller board (I.B)
(1) Remove the electrical box cover. (See Photo 1 and 2)
(2) Disconnect the connectors:
CNMF (White) for fan motor
CNV (White) for vane motor
CN90 (White) for signal receiver (Option)
CNP (White) for drain pump
CN4F (White) for float switch
CN44 (White) for thermistor (TH2/TH5)
CN01 (Black) for Indoor/Outdoor connecting line
CN3C (Blue) for Indoor/Outdoor transmission
Disconnect the connectors for optional parts, if any.
(3) For the unit controlled with the wireless remote controller,
disconnect the lead wire connected to TB5 on the indoor
controller board.
TB5: Remote controller transmission connecting wire
(4) Remove the indoor controller board (3 holders/4 Hooks).
(See Photo 5)
OCH784
PHOTOS/FIGURES
Photo 3
Electrical box
Indoor controller
board
Electrical box fixing screws (M5×10)
Photo 4
Thermistor (TH1)
Photo 5
Holders
36
Room temperature thermistor (TH1)
CN20
Thermistor holder
Hooks