Mitsubishi MXZ-8B140VA Technical & Service Manual page 43

Outdoor power circuit board
MXZ-8B140YA
MXZ-8B160YA
CN5
CN4
Detection of
Connect to the
primary current
outdoor controller
(Connect to the
circuit board
outdoor noise filter
(CN4)
circuit board (CNCT))
TAB connecter
on X52A
Connect to the
RS resistor
TB-P2
Connect to the smoothing
capacitor CB1
OCH480D
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
L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1
2 Check of IGBT circuit
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
Note: The marks, L1 , L2 , L3 , N1 , N2 , P1 , P2 , U , V and W
shown in the diagram are not actually printed on the board.
CN7
Connect to the
outdoor converter
circuit board
(CN7)
P1
P2
+
43
CN2
Connect to the outdoor controller circuit
board (CN2)
1-5: Power circuit board
signal to the controller board (0-5V DC)
2-5: Zero cross signal (0-5V DC)
[ 5 : –
3-4: Not used
6-5: 16V DC
7-5: 16V DC
W
W
W
L3
L2
L1
N1 N2
TB-C1
Connect to the
smoothing capacitor
– +
CB1 , CB2
Transmitting
→
1, 2, 6, 7 : + ]
TB-U, TB-V,
TB-W
Connect to the
compressor (MC)
Voltage among
phases:
10V-400V AC
TB-L1, TB-L2, TB-L3
Connect to the
outdoor converter
circuit board
(L1-OU, L2-OU,
L3-OU) (140/160VA)
Connect to the outdoor
noise filter circuit board
(LO1, LO2, LO3)
(140/160YA)
380V-415V AC
TB-N1
Connect to the
smoothing capacitor
–
CB2 , CK capacitor
(CK capacitor only for
140/160VA)
POWER
MODULE