Noise - Mitsubishi PUZ-A18NHA6 Service Manual

Outdoor power circuit board
PUZ-A30/36/42NHA6
PUZ-A30/36/42NHA6-BS
PUY-A30/36/42NHA6
PUY-A30/36/42NHA6-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
CNAF
Connect to ACTM
CN3
Thermistor (TH8)
<Heat sink>
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)
OCH577A
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 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: 10–180 V AC
75
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 fil-
ter circuit board
Voltage among
phases: 208/230
V AC
TABP1
Connect to 52C
TABN1
Connect to
ACTM