Service manual

36
Check of power supply
J
Inverter does not operate.
Check of outdoor fan motor
I
Outdoor fan motor does not operate.
Does the voltage between
each terminal repeat 5V
and 0V DC by turns?
Does the outdoor fan
rotate smoothly?
Check the inverter P.C. board.
(Refer to 11-6. M)
No
Yes
Yes
( Fixed to either 5V or 0V DC)
Yes
No
Rotate the outdoor fan slowly
by hand, and measure the
voltage of CN931 (Measurement
of feedback output).
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
Is the resistance
between each terminal of
outdoor fan motor normal?
(Refer to 11-5.)
Disconnect CN932
from the inverter
P.C. board.
Replace the outdoor fan
motor.
CN931
CN932
Inverter P.C. board
(Solder side)
Turn ON the
power supply.
No
Disconnect the connector
(CN61) between compressor and
intelligent power module.
Turn ON power supply and press
EMERGENCY OPERATION
switch.
Check the electric
parts in main circuit.
If light up, ok.
If flash, refer to
11-4.
Is there voltage
280V ~ 370V DC
between DB61 (+) and
DB61 (–) on the
inverter P.C. board?
Refer to 11-7.1.
Dose LED on the inverter
P.C. board light up or
flash? Refer to 11-7.1.
Yes
Yes
Yes
No
No
Replace the indoor
electronic control
P.C. board.
Yes
No
No
Replace the inverter
P.C. board.
DB61
280V~370V DC
Inverter P.C. board
(Solder side)
Is there voltage 230V AC
between the indoor
terminal block S1and
S2?
Rectify indoor/ outdoor
connecting wire.
Does POWER lamp on the
indoor unit light up?
OB372D --2qxp 07.5.7 4:49 PM Page 36