Mitsubishi Electric FDF71VNXVD Technical Manual page 148

Models FDC200,250VS
Outdoor unit check points
●
Cheek items with the *mark when the power is ON.
*
Power supply check:
Noise filter check:
Measure the power supply L1,L2,L3 There should be continuity.
(It is normal if it is AC380-415V)
There should be no shorts between phases.
TB1
Red
L1 L1i L1o
White PWB3
L2
L2i L2o
NOISE FILTER PWB
Blue
L3 L3i L3o
F
250V 10A
Black
N Ni E No
1
2
Fuse check:There should be
3 continuity.
2
CNW
CNW2
RAM
CNE
63H
CNH
CNR
CH1
LED2 (Red) check:
1 ~ 5 time flash (Refer to page 121)
Resistance check:
Resistance is measured
(15Ω)
R1 R2
1 2
R5
AC1
＋4
DM
AC2
－6
G K
3 4 AC3
CT1
52X
3
LTP
CNIP CNTH CNU CNPS CNA2
CNI1
PWB1
CONTROL PWB
CNA1
CNFAN1
F1 (250V, 3A)
LED1 LED2
(Green) (Red)
CNS CNM
CNFAN2
CNEEV1 CNEEV2
20S 52X
SM1 SM2
Capacitor check:
DC Reactor contiuity
Check for anomaly in appearance
check: 55mΩ or less
such as damage, swelling, etc.
L1
R3 C1
R4 C2
P2
P3
N2
PWB2
INVERTER PWB
LED1 LED2
(Green) (Red)
CNI3
2
CNW1
CNO1
PWB4
CNO2
FMO1
DC FAN PWB
FMO2
When the outdoor unit
fan motor is anomalous:
(Refer to page 186)
Power transistor module check:
Check for burnout, open circuit or damage
(see page XXX for the check procedure).
CT1
Red
U
P
U
White
V V CM
W
Brown
N W
Fuse check:There should
be continuity.
If it is faulty, replace the
inverter board.
F1 (250V 3A)
LED2 (Red) Check
1 ~ 6 times flash
(Refer to page 121)