Brief Check Of Power Module; Noise - Mitsubishi Electric PUZ-A18NHA4 Service Manual

Outdoor power circuit board
PUZ-A30/36/42NHA4
PUZ-A30/36/42NHA4-BS
PUY-A30/36/42NHA4
PUY-A30/36/42NHA4-BS
CN2
Connect to the outdoor controller circuit board
(CN2)
1-5:Transmitting signal to the outdoor
controller circuit board (0~5V DC)
2-5:Zero cross signal (0~5V DC)
3-4:18V DC
6-5:16V DC
7-5:16V DC
CNAF
Connect to ACTM
CN3
Thermistor (TH8)
<Heatsink>
CN5
Detection of primary
current
Connect to the
outdoor noise filter
circuit board (CN5)
CN4
Connect to the
outdoor controller
circuit board (CN4)
TABP2/SC-P2
Connect to
ACTM
TABN
TABP
Connect to the
Connect to the
smoothing capacitor
smoothing capacitor
CB –
CB +
(A42N only)
(A42N only)

Brief check of POWER MODULE

W 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 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
DIP-IPM
TABU/V/W
Connect to the compressor (MC)
Voltage among phases: 10V~180V AC
69
CNDC
280-380V DC (1+, 3–)
Connect to the outdoor
controller circuit board
TABN2
Connect to ACTM
TABS/TABT
Connect to the
outdoor noise fil-
ter circuit board
Voltage among
phases:
208/230V AC
TABP1
Connect to 52C
TABN1
Connect to
ACTM