Mitsubishi Electric MSZ-G09SV-E1 Service Manual page 56

(How to check power supply and others)
M
Check of power supply
Inverter does not work.
Disconnect the connector
between compressor and
transistor module.
Turn ON power supply to indoor
unit and press EMERGENCY
OPERATION switch.
3 minutes after power
ON, is there voltage of
approx. 230V AC
between outdoor
terminal block 2and N?
Yes
Is there voltage of
approx. 340V DC
between TAB 64(-) and
TAB 63(+)?
No
Check the electric
parts in main circuit.
N
Check of thermal fuse
Turn OFF the
power supply.
O
Check of rush current limiting circuit
Outdoor unit does not operate at all or stops immediately due to over current.
NOTE : When the current limiting resistor is open, the rush current limiting relay may not be working
properly. Therefore confirm the limiting resistor works properly after replacing it.
Start
Repair wiring.
Press the
EMERGENCY
No
OPERATION switch
again.
Does the 52C work?
Yes
Dose LED light up or
flash?
Is resistance ∞ between the connector CN 201 1 on indoor
electronic control P.C. board and the terminal block N?
Does current limiting resistor (R64) detect 10"?
Ok
Yes
Replace the indoor
No
electronic control
P.C. board.
Replace the outdoor
No
electronic control P.C.
board.
Yes
Ok
No
Ok
No ∞
Yes
56
Outdoor terminal block
N
In-out
2
connecting
wire
3
Yes
Replace the
thermal fuse (F12).
Indoor electronic
control P.C. board
CN201
Replace the current limiting resistor (R64).