Mitsubishi Electric MUZ-LN25VG-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)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature ther-
mistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (Expansion valve coil)
CN64 (Compressor protector)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the heat sink support and the sepa-
rator.
(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 5)
1. Connect the lead wires of the heat exchanger temperature
thermistor and the expansion valve coil to the connector on
the inverter P.C. board. Pull the lead wires of the heat
exchanger temperature thermistor and the expansion valve
coil toward you and put them on the left and right hooks on
the P.C. board support so that the other lead wires are bun-
dled up as shownin Photo 5.
Photo 5
Lead wires of the heat exchanger
temperature thermistor and the
expansion valve coil
Inverter P.C.
board support
Fix the lead wires of the
compressor protector
and the discharge
temperature thermistor.
OBH767G
Connector of
the compressor
protector
Clamp the
end of the
compressor
protector's
tube.
Fold back the
tube of the
compressor
protector.
Cut the surplus
of the fastener
to prevent it
from hitting the
front panel.
Pass the lead wire of compressor
protector through the top felt hole.
PHOTOS/FIGURES
Photo 4
Screw of the P.B. support
and the separator
Screw of the heat
sink support and
the separator
Photo 6 (Inverter assembly)
Heat sink support
Heat sink
P.C. board support
Inverter P.C. board
81
Screws of the terminal block
support and the back panel
Screws of
the earth wire
Screw of the inverter P.C. board