Operating Procedure - Mitsubishi Electric MUZ-GA35VA-E3 Service Manual

OPERATING PROCEDURE

2. Removing the inverter assembly, inverter P.C. board
and power P.C. board
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel. (Refer to 1.)
(3) Disconnect the ground wires (See Photo 3.), the lead wire
to the reactor and the following connectors;
<Power P.C. board>
CN721 (4-way valve)
CN771 (Fan motor) MUZ-GA25VA/GA25VAH
CN722 (Defrost heater) MUZ-GA25/GA35VAH
CN923 (Solenoid valve coil)
MUZ-GA25VA-
MUZ-GA25VAH-
<Inverter P.C. board>
CN931,CN932 (Fan motor) MUZ-GA35VA/GA35VAH
CN641 (Defrost thermistor and discharge temperature
thermistor)
CN643 (Ambient temperature thermistor)
CN724 (LEV) MUZ-GA35VA/GA35VAH
(4) Remove the compressor connector (CN61).
(5) Remove the screws fixing the relay panel. (See Photo 3.)
(6) Remove the inverter assembly. (See Photo 4.)
(7) Disconnect all connectors and lead wires on the inverter
P.C. board. (See Photo 4.)
(8) Remove the inverter P.C. board from the inverter assembly.
(9) Remove the screw fixing the power P.C. board. (See Photo
4.)
(10) Disconnect all connectors and lead wires on the power P.C.
board.
(11) Remove the power P.C. board from the inverter assembly.
3. Removing R.V. coil
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the R.V. coil. (See Photo 5.)
4. Removing the discharge temperature thermistor and
defrost thermistor
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Pull out the discharge temperature thermistor from its
holder. (See Photo 5.)
(5) Pull out the defrost thermistor from its holder. (See Photo 6.)
(Serial No. ~6021350T)
E1 E2 E3
/ /
(Serial No. ~7000000T)
E1 E2 E3
/ /
Photo 3
Photo 4 (Inverter assembly)
Heat sink
Photo 5
Discharge temperature thermistor
54
PHOTOS
Screws of the
relay panel
Screws of
Inverter
Power
P.C. board
P.C. board
Screw of the
power P.C. board
R.V. coil
the ground
wires