Mitsubishi Electric MUZ-AP25VG-E1 Service Manual page 81

OPERATING PROCEDURE
2. Removing the inverter assembly and inverter P.C.
board
(1) Remove the cabinet and panels. (Refer to section 1.)
(2) Disconnect the lead wire to the reactor and the following con-
nectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN722 (Defrost heater)(MUZ-AP50VGH)
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 heat sink support and the sep-
arator.
(5) Remove the fixing screw of the P.B. support and the separator.
(6) Remove the fixing screws of the terminal block support and
the back panel.
(7) Remove the inverter assembly.
(8) Remove the heat sink support from the P.C. board support.
(9) Remove the screw of the inverter P.C. board and remove the
inverter P.C. board from the P.C. board support.
* Connection procedure when attaching the inverter P.C.
board (Photo 4)
1. Connect the lead wires of the heat exchanger temperature
thermistor, the defrost thermistor and discharge tempera-
ture thermistor to the connector on the inverter P.C. board.
Pull the lead wires toward you and put them on the right
hook on the P.C. board support.
2. Connect the lead wires of the expansion valve to the
connector on the inverter P.C. board. Pull the lead wires
toward you and put them on the right hook on the P.C.
board support.
3. Connect the lead wires of the ambient temperature ther-
mistor to the connector on the inverter P.C. board. Pull
the lead wires toward you and put them on the left hook
on the P.C. board support so that the fan motor lead wires
are bundled up as shown in Photo 4.
OBH789H
PHOTOS/FIGURES
Photo 3
Screw of the heat sink
support and the separator
Photo 4
Lead wires of
the heat exchanger
Lead wires of
temperature,
the ambient
defrost and discharge
temperature
temperature thermistor
thermistor
Inverter P.C. board support
Photo 5 (Inverter assembly)
Heat sink support
P.C. board support
Heat sink
Inverter P.C. board
Screw of the inverter P.C. board
81
Screw of the P.B. support
and the separator
Screws of
the terminal block
support and
the back panel
Lead wires of
the expansion
valve coil
Screws of
the earth wire