Noise - Mitsubishi PUZ-A18NHA6 Service Manual

10-6-6. Check method of power circuit board
PUZ-A30/36/42NHA6
PUY-A30/36/42NHA6
Power circuit board check
Is the voltage of main incoming power
198–253 V AC
Yes
Is the voltage of CNDC(PNK) on outdoor
controller circuit board 280–350 V DC?
Yes
Is the voltage to the compressor
(U-V,U-W and V-W) balanced?
Yes
Normal
280–350 V DC
Outdoor controller circuit board
3
-
1
conv.
CNDC
circuit
(PNK)
CN2
7 6 5 4 3 2 1
(WHT)
Note: See test point.
OCH577A
PUZ-A30/36/42NHA6-BS
PUY-A30/36/42NHA6-BS
Note: To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
No
No
No
Noise filter circuit board
52C
LO
198–253 V AC
NO
208/230 V ±10% AC
Power circuit board
60
• Check the breaker and power supply.
• Check wiring.
• Check power circuit board.
• Check noise filter circuit board.
• Check wiring.
• Check model setting switch SW6
on the outdoor controller circuit board.
• Replace the power circuit board.
198–253 V AC
LI
L1
NI
L2
TB1
U-V 10–250 V AC
U-W 10–250 V AC
V-W 10–250 V AC
W
V COMP
U
W
W
W
Circuit diagram