Mitsubishi Electric SVZ-KP18NA Service Manual page 38

OPERATING PROCEDURE
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature ther-
mistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the relay panel. (See Photo 3)
(5) Remove the inverter assembly. (See Photo 4)
(6) Remove the screw of the ground wire and screw of the
T.B.support. (See Photo 4)
(7) Remove the relay panel from the inverter assembly.
(8) Remove the inverter P.C. board from the relay panel.
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil. (See Photo 5)
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger tempera-
ture thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature ther-
mistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(See Photo 5)
(4) Pull out the defrost thermistor from its holder. (See Photo 6)
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (See Photo 6)
(6) Pull out the ambient temperature thermistor from its holder.
TCH022
Photo 3
Photo 4 (Inverter assembly)
Inverter
Heatsink P.C. board
Relay panel
Photo 5
Discharge temperature thermistor
38
PHOTOS
Screws of the
relay panel
Screw of the
T.B.support
T.B.support
Screw of the
ground wire
R.V. coil