Mitsubishi Electric MUZ-LN25VG Service Manual page 55

OPERATING PROCEDURE
2. Removing the inverter assembly and inverter P.C.
board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following con-
nectors:
<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 heat sink support and the sep-
arator.
(5) Remove the fixing screw of the P.B. support and the separa-
tor.
(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 5)
1. Connect the lead wires of the heat exchanger temperature
thermistor to the connector on the inverter P.C. board. Pull
the lead wires of the heat exchanger temperature thermis-
tor toward you and put them on the left hook on the P.C.
board support so that the other lead wires are bundled up
as shown in Photo 5.
2. Connect the lead wires of the expansion valve coil to the
connector on the inverter P.C. board. Pull the lead wires of
the expansion valve coil toward you and put them on the
right hook on the P.C. board support so that the other lead
wires are bundled up as shown in Photo 5.
Photo 6 (Inverter assembly)
Heat sink support
Heat sink
P.C. board support
Inverter P.C. board
Screw of the inverter P.C. board
OBH767
Photo 4
Screw of the heat sink
support and the separator
Photo 5
Lead wires of the heat exchanger
temperature thermistor
Inverter P.C. board support
Screw of the
earth wire
55
PHOTOS
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