Mitsubishi Electric NTXMSM36A142BA Technical & Service Manual page 121

Outdoor power circuit board
NTXMSM60A182BA
NTXMSH36A142BA
NTXMSH42A152BA
NTXMSH48A182BA
TB3, TB4
Voltage of 208/230 V AC
is input
(Connect to the outdoor
noise filter board (TB1,
TB2))
TB1A, TB2A, TB3A,
TB1B, TB2B, TB3B
Connect to DCL
CNDC
290–380 V DC ( +, −)
Connect to the outdoor
multi controller circuit
board (CNDC)
OCHT810A
Brief Check of POWER MODULE
If they are short-circuited, it means that they are broken.
Measure the resistance in the following points (connectors, etc.).
1. Check of POWER MODULE
Check of DIODE circuit
R - L1 , S - L1 , R - N1 , S - N1
Check of IGBT circuit
L2 - N1
Check of INVERTER circuit
P - U , P - V , P - W , N1 - U , N1 - V , N1 - W
Note: The marks R , S , L1 , L2 , P , N1 , U , V and W shown
in the diagram are not actually printed on the board.
N2 L2 P2
N3
L3 L1
121
CN4
Connect to the outdoor
multi controller circuit
board (CN4)
CN2
Connect to the outdoor
multi controller circuit
board (CN2)
– : Transmitting sig-
V P3
– : Zero cross signal
W U
– : 15 V DC
– : 15 V DC
– : 15 V DC
TB-U, TB-V, TB-W
Connect to the compres-
sor (MC)
Voltage among phases:
10-180 V AC
CN6
Thermistor (TH8)
nal to outdoor
controller circuit
board ((0–5 V
DC)
(0–5 V DC)