Mitsubishi Electric PUZ-A18NHA6 Service Manual page 57

PUZ-A24NHA6
PUY-A24NHA6
Noise filter circuit board check
Is the voltage of main incoming power
198–253 V AC?
Yes
Is the voltage of CNAC (WHT) on
outdoor controller circuit board CNAC (WHT)
198–253 V AC?
Yes
Is the voltage of CNDC(PNK) on outdoor
controller circuit board 280–350 V DC?
Yes Yes
Normal
Outdoor Controller Circuit Board
12 V DC from outdoor
controller circuit board CN52C
Power circuit board
3
To outdoor controller
circuit board CNDC(PNK)
1
280–350 V DC CNDC
(PNK)
PUZ-A24NHA6-BS
PUY-A24NHA6-BS
Note: To check the voltage of the parts on this board with a tester is difficult due to its location.
No
No
Turn off the incoming power supply
No
and check the resistance of RS on
Replace the noise filter circuit board, and check
52C-relay,wiring,power board and ACTM.
Noise filter circuit board
208/230 V
±10% AC
1 1 2 2
3 3 4 4
CNAC
(WHT)
52C(relay)
S
Conv.
Circuit
R
Test points are limited.
the noise filter circuit board.
No
(normal)
RS = open ?
Yes (open)
N
L
TB1
RS(resister)
Check the breaker and power supply.
Check wiring.
Replace the noise filter circuit board.
Check wiring.
Check power board.
198–253 V AC
Circuit diagram