Mitsubishi Electric PUZ-SM100VKA2 Service Manual page 59

Outdoor power circuit board
PUZ-SM100VKA2.TH
PUZ-SM125VKA2.TH
PUZ-SM140VKA2.TH
CN2
Connect to the outdoor
controller circuit board (CN2)
- :Transmitting signal to
outdoor controller
circuit board (0-5 V DC)
- : Zero cross signal
(0-5 V DC)
- :15 V DC
- :15 V DC
- :15 V DC
TB1A, TB2A, TB3A,
TB1B, TB2B, TB3B
Connect to DCL
*TB2A and TB2B are
not mounted on board
for SM100V model.
CNDC
280-380 V DC ( +, -)
Connect to the out-
door controller circuit
board (CNDC)
OCH774A
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 - P1 , S - P1 , R - N1 , S - N1
Check of IGBT circuit
P2 - L1 , P2 - L2 , P2 - L3 , N2 - L1 , N2 - L2 , N2 - L3
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.
59
EI, E2, E3, E4
Connect to the earth
CN6
Thermistor
<Heat sink>
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))