Mitsubishi Electric MXZ-A18WV Service Manual page 73

OPERATING PROCEDURE
5. Removing the thermistor
Discharge temperature thermistor, defrost,
evaporator temperature, high-pressure protect,
gas pipe temperature A and gas pipe temperature B
(1) Remove the top panel, service panel, front panel.
(2) Remove indoor/outdoor connecting wire and power supply
cable.
(3) Remove thermistor connector (CN661, CN662) from the
electronic control P.C. board.
(4) Remove the inverter assembly.
(5) Remove the thermistor in the upper part of compressor.
(6) Remove the back panel.
(7) Remove the thermistors for defrost, evaporator temperature,
gas pipe temperature A and gas pipe temperature B.
Fin temperature thermistor
(1) Remove the top panel, service panel and front panel.
(2) Remove the connector coming out of the compressor.
(3) Remove the compressor connector coming out of the
electronic control P.C. board. (Fig. 1)
(4) Remove the electronic control P.C. board.
(5) Remove the screws fixing the heat sink from the electronic
control P.C. board. (Tightening torque IPM: M4 1.18
I0.2[Nm] DS: M3 0.78 I0.2[Nm] AFM: M3.5 0.98 I0.2[Nm])
Caution: Be sure to keep silicon oil applied between the
heat sink and the electronic control P.C. board away from
dirt etc.
Do not wipe off silicon oil.
Otherwise the temperature of the electronic control P.C. board
may rise unusually.
Photo 8
High-pressure protect thermistor
Terminal
cover
Photo 9
Evaporator temperature thermistor
Photo 10
Heat sink
73
PHOTOS
Defrost
thermistor
Gas pipe
temperature
thermistor
A, B
Sound proof
felt
Discharge
temperature
thermistor
Defrost thermistor
Fin temperature thermistor