Mitsubishi Electric PUHZ-SP125VKA Service Manual page 62

Outdoor power circuit board
PUHZ-SP125VKA.TH
PUHZ-SP140VKA.TH
CN2
Connect to the outdoor
controller circuit board (CN2)
1-5:Transmitting signal to
outdoor controller
circuit board (0-5 V DC)
2-5: Zero cross signal
(0-5 V DC)
3-4:16 V DC
6-5:16 V DC
7-5:16 V DC
TB1A, TB2A, TB3A,
TB1B, TB2B, TB3B
Connect to DCL
CNDC
280-380 V DC (1+, 3-)
Connect to the out-
door controller circuit
board (CNDC)
OCH671
Brief Check of POWER MODULE
Usually, they are in a state of being short-circuited if they are broken.
Measure the resistance in the following points (connectors, etc.).
If they are short-circuited, it means that they are broken.
1. Check of POWER MODULE
1 Check of DIODE circuit
R - P1 , S - P1 , R - N1 , S - N1
2 Check of IGBT circuit
P2 - L1 , P2 - L2 , P2 - L3 , N2 - L1 , N2 - L2 , N2 - L3
3 Check of INVERTER circuit
P3 - U , P3 - V , P3 - W , N3 - U , N3 - V , N3 - W
Note: The marks R , S , L1 , L2 , L3 , P1 , P2 , P3 , N1 , N2 , N3 , U , V and W
shown in the diagram are not actually printed on the board.
EI, E2, E3, E4
Connect to the earth
62
CN6
Thermistor
CN4
Connect to the outdoor
controller circuit board
(CN4)
CNAC1, CNAC2
230 V AC
Connect to the outdoor
controller circuit board
(CNAC)
NI, LI
Voltage of 230
V AC is input
(Connect to the
terminal block
(TB1))