Mitsubishi SUZ-KA35VA Service Manual page 74

Outdoor fan motor does not operate.
Check of outdoor fan motor
I
Is the resistance
between each terminal of
outdoor fan motor normal?
(Refer to 12-4.)
No
Replace the outdoor fan
motor.
Inverter does not operate.
Check of power supply
J
Disconnect the connector (CN61)
between compressor and intelligent
power module.
[For wireless remote controller use model]
Turn ON power supply and press
EMERGENCY OPERATION switch.
[For wired remote controller use model]
Turn ON the power supply and press the
TEST button twice.
Does POWER lamp on the
indoor unit light up?
Yes
Is there voltage
280V ~ 370V DC
between DB61 (+) and
DB61 (-) on the
inverter P.C. board?
Refer to 12-6.1.
No
Check the electric
parts in main circuit.
OC322G
Disconnect CN932
Yes
from the inverter
P.C. board.
Inverter P.C. board
(Solder side)
CN931
CN932
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230V AC
No
between the indoor
terminal block S1 and
S2?
Dose LED on the inverter
Yes
P.C. board light up or
flash? Refer to 12-6-1.
Yes
Ok.
If flash, refer to
12-3.
Turn ON the
power supply.
No
( Fixed to either 5V or 0V DC)
No
Outdoor terminal block
Indoor/outdoor
connecting
wire
Replace the indoor
No
electronic control
P.C. board.
No
Replace the inverter
P.C. board.
DB61
Inverter P.C. board
(Solder side)
74
[SUZ-KA25/35VA(H).TH]
Rotate the outdoor fan slowly
by hand, and measure the
voltage of CN931 (Measurement
of feedback output).
Between (+) and (-)
Between (+) and (-)
Between (+) and (-)
Does the voltage between
each terminal repeat 5V
and 0V DC by turns?
Yes
Does the outdoor fan
rotate smoothly?
Yes
Check the inverter
P.C. board.
(Refer to 12-5. )
S3
S2
S1
280V~370V DC