Mitsubishi Electric PUHZ-FRP71VHA2 Service Manual page 53

Outdoor power circuit board
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1
CN6 CN4
Thermistor Connect to the outdoor
controller circuit board
(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
OCH665B
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 POWER MODULE
1 Check of DIODE circuit
R – P1
2 Check of PFC circuit
– L1 P2 – L2 N2 – L1 N2 – L2
P2
3 Check of INVERTER circuit
– U , P3 – V , P3 – W , N3 – U , N3 – V , N3 – W
P3
Note: The marks
U , V
CNAC1, CNAC2
230 V AC
Connected to the outdoor
controller circuit board
(CNAC)
P3
U
V
W
N3
P2
L1
L2
N2
S R
P1 N1
TB1A, TB3A, TB1B, TB3B
Connected to DCL
53
S – P1 R – N1 S – N1
R , S , L1 , L2 , P1 , P2 , P3 , N1 , N2 , N3 ,
W
and show in the diagram are not actually printed on the board.
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 earth
–
)