Och636A - Mitsubishi Electric PUZ-A12NKA7 Service Manual

Outdoor power circuit board
PUZ-A36NKA7
PUZ-A42NKA7
PUZ-A36NKA7-BS
PUZ-A42NKA7-BS
PUY-A36NKA7
PUY-A42NKA7
PUY-A36NKA7-BS
PUY-A42NKA7-BS
CN4
Connect to the outdoor
CN6
controller circuit board
Thermistor
(CN4)
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

OCH636A

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 POWER MODULE
1 Check of DIODE circuit
R – P1 S – P1
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
show in the diagram are not actually printed on the board.
CNAC1, CNAC2
230 V AC
Connected to the outdoor
controller circuit board
(CNAC)
P3
U
V
W
N3
P2
L1
L2
L3
N2
S R
P1 N1
TB1A, TB2A, TB3A, TB1B,
TB2B, TB3B
Connected to DCL
69
R – N1 S – N1
R , S , L1 , L2 , L3 , P1 , N1 , U , V and W
NI, LI
Voltage of 230 V AC is input
(Connected to the terminal block
(TB1))
CNDC
280–380 V DC (1+, 3
connect to the outdoor
controller circuit board
(CNDC)
EI,E2,E3,E4
Connected to
the ground
–
)