Muz09Un, Muz12Un Outdoor Unit; Removing The Cabinet; Removing The Inverter Assembly; Removing The Electronic Control P.c. Board - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

11-3. MUZ09UN MUZ12UN
OUTDOOR UNIT
OPERATING PROCEDURE

1. Removing the cabinet

(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it from the cabinet.
(3) Remove the screws fixing the top panel and remove the top
panel.
(4) Remove the screws fixing the cabinet and remove the
cabinet.
Photo 2

2. Removing the inverter assembly

(1) Remove the service panel, top panel and the cabinet.
(Refer to 1.)
(2) Disconnect the connectors (CN641 and CN724) on the elec-
tronic control P.C. board.
(3) Remove the connectors (CN771 and CN721) on the relay
P.C. board.
(4) Remove the screws fixing the inverter assembly.
(5) Remove the compressor connector.
(6) Remove the inverter assembly.
3. Removing the noise filter P.C. board
(1) Remove the service panel, top panel and the cabinet.
(Refer to 1.)
(2) Remove all the connectors and the terminals on the noise fil-
ter P.C. board.
(3) Remove the screw of ground wire on the relay panel.
(4) Remove the hooks of T.B. support. Then, remove the noise
filter P.C. board.
4. Removing the relay P.C. board
(1) Remove the service panel, top panel and the cabinet.
(Refer to 1.)
(2) Remove all the connectors and the terminals on the relay
P.C. board.
(3) Remove the hooks of T.B. support. Then, remove the relay
P.C. board.

5. Removing the electronic control P.C. board

(1) Remove the service panel, top panel and the cabinet.
(Refer to 1)
(2) Remove the inverter assembly.
(3) Remove the terminal of diode stack.
(4) Remove all the connectors and the terminals on the
electronic control P.C. board.
(5) Remove the screws fixing the heat sink.
(6) Pull up the heat sink and remove the electronic control P.C.
board from the relay panel.
(7) Remove the screws fixing the heat sink on the electronic
control P.C. board.
(8) Remove the electronic control P.C. board from the heat
sink.
Photo 1
Hooks
Photo 3
Photo 4
Diode
stack
Compressor
connector
66
PHOTOS
Screws of the top panel
Screws of
the cabinet
Outdoor
R.V. coil
fan motor
connector
connector
Relay
P.C.
Screws of
board
the heat sink
Hooks of
T.B. support
Screw
of the
service
panel
Screws of the
inverter assembly
Compressor
connector
Noise
filter Electronic
P.C. control
P.C.
board
board
Screw of the
ground wire