Check Of Outdoor Power Supply - Mitsubishi Electric MSZ-G09SV Service Manual

Unit doesn't operate with the remote controller.
Also, OPERATION INDICATOR lamp doesn't light up by EMERGENCY OPERATION switch ON.
Check of indoor electronic control P.C. board
T
Check both "parts side"
and "pattern side" of indoor
electronic control P.C.
board visually.
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
Varistor (NR11)
Fuse (F11)
Indoor electronic
control P.C. board
U

Check of outdoor power supply

Start
Check the connecting of main circuit parts.
Turn ON power supply.
Is there voltage 230V AC between the
L
power supply terminal block
Yes
Is there voltage 325V DC across the
smoothing capacity?
Yes
Replace the outdoor electronic control
P. C. board.
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and vane motor connector CN151
from the indoor electronic control P.C. board and turn ON the power supply.
Yes
Replace the vane motor.
Turn OFF the
power supply.
Yes
Is winding resistance
of vane motor 0 "?
Be sure to check both resistance.
Is winding resistance
of fan motor 0 "?
Yes
Replace the fan motor.
No
Check the power supply cable.
N
- ?
Is there voltage 230V AC across the
No
input terminal part in the diode stack
(DS61)?
Check the main circuit parts
and replace them.
No
Turn OFF the
power supply.
No
Is fuse (F11) blown?
Be sure to check both fuse
and varistor in any case.
Is varistor (NR11) burnt?
No
Replace the varistor.
No
Yes
85
Replace the fuse.
Yes
No
No
Yes
Replace the noise
filter P. C. board.
Replace the
indoor electronic
control P.C. board.