Mitsubishi Electric PUHZ-SW75VHA.UK Service Manual page 52

Outdoor power circuit board
PUHZ-SW100YHAR1.UK
PUHZ-SW120YHAR1.UK
PUHZ-SW100YHAR1-BS.UK
PUHZ-SW120YHAR1-BS.UK
Diode module
TAB connector
on X52CA
Connect to the
RS resistor
TB-L1,
TB-L2,
TB-L3
Connect to the
outdoor converter
circuit board
(L1-OU, L2-OU,
L3-OU)
400V AC
CN4
Connect to the
outdoor controller
circuit board (CN4)
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)
3-4: Not used
6-5: 16V DC
7-5: 16V DC
[ 5 : – 1, 2, 6, 7 : + ]
OCH533B
Brief Check of POWER MODULE
* Usually, they are in a state of being short-circuited if they are broken.
1. Check of DIODE MODULE
2. Check of DIP-IPM
Note: The marks L1 , L2 , L3 , N1 , N2 , P1 , P2 , U , V and W
TB-N
Connect to the CK capacitor
P1 L1 L2
CN5
Detection of primary
current (Connect to
the outdoor noise filter
circuit board (CNCT))
Transmitting
Measure the resistance in the following points (connectors, etc.).
If they are short-circuited, it means that they are broken.
L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
shown in the diagram are not actually printed on the board.
N2
L3 N1
CN7
Connect to the
outdoor converter
circuit board (CN7)
CN6
Thermistor
<Heat sink> (TH8)
52
TB-U, TB-V, TB-W
Connect to the compressor (MC)
Voltage among phases:
10V-400V AC
W V U P2
L3OUT-L3IN
Lead connect
DIP-IPM