Mitsubishi Electric PUHZ-W50VHA Service Manual page 78

Outdoor power circuit board
PUHZ-W85VHA(-BS)
PUHZ-W85VHAR1(-BS)
CN2
Connect to the outdoor controller circuit board
(CN2)
1–5: Transmitting signal to the outdoor
controller circuit board (0–5 V DC)
2–5: Zero cross signal (0–5 V DC)
3, 4: 18 V DC
6–5: 16 V DC
7–5: 16 V DC
CN3
Thermistor (TH8)
<Heat sink>
CN5
Detection of input
current
Connect to the
outdoor noise filter
circuit board (CN5)
CN4
Connect to the
outdoor controller
circuit board (CN4)
TABP2
Connect to the
ACTM
OCH439M
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 diode bridge
TABP1-TABS, TABN1-TABS, TABP1-TABT, TABN1-TABT
2. Check of DIP-IPM
P - U , P - V , P - W , N - U , N - V , N - W
CNAF
Connect to ACTM
DIP-IPM
TABU/V/W
Connect to the compressor (MC)
Voltage among phases: 10–180 V AC
78
CNDC
280–380 V DC (1+, 3−)
Connect to the outdoor
controller circuit board
TABN2
Connect to ACTM
TABS/TABT
Connect to the
outdoor noise
filter circuit board
Voltage among
phases: 230 V AC
TABP1
Connect to
+
ACTM
TABN1
Connect to
ACTM
—