Mitsubishi Electric MXZ-2B30VA Service Manual page 90

OPERATING PROCEDURE
2. Removing the inverter assembly, inverter P.C. board
and power P.C. board
(1) Remove the top panel, cabinet and service panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel (Refer to 1).
(3) Disconnect the earth wires, the lead wire to the reactor and
the following connectors;
<Power P.C. board>
CN912 (R.V coil)
<Inverter P.C. board>
CN931, CN932 (Fan motor)
CN661 (Defrost thermistor, discharge temperature
thermistor and outdoor heat exchanger
temperature thermistor)
CN663 (Ambient temperature thermistor)
CN791, CN792 (LEV A, LEV B)
(4) Remove the compressor connector (CN61).
(5) Remove the screws fixing the relay panel.
(6) Remove the inverter assembly.
(7) Disconnect all connectors and lead wires on the inverter P.C.
board.
(8) Remove the inverter P.C. board from the inverter assembly.
(9) Remove the screw fixing the power P.C. board.
(10) Disconnect all connectors and lead wires on the power P.C.
board.
(11) Remove the power P.C. board from the inverter assembly.
3. Removing R.V. coil
(1) Remove the top panel, cabinet and service panel
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel (Refer to 1).
(3) Remove the inverter assembly (Refer to 2).
(4) Remove the R.V. coil.
4. Removing the discharge temperature thermistor,
defrost thermistor and outdoor heat exchanger
temperature thermistor
(1) Remove the top panel, cabinet and service panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting
wire and remove the back panel (Refer to 1).
(3) Remove the inverter assembly (Refer to 2).
(4) Pull out the discharge temperature thermistor from its
holder.
(5) Pull out the defrost thermistor from its holder (Photo 5).
(6) Pull out the outdoor heat exchanger temperature thermistor
from its holder (Photo 5).
OBH554D
Photo 2
Screws of the
relay panel
Photo 3
Heat sink
Compressor
connector
(CN61)
Photo 4
Discharge temperature thermistor
90
PHOTOS
Inverter
assembly
Screws of
the earth
wires
Inverter
Power
P.C. board
P.C. board
Screw of the
power P.C. board
R.V. coil