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Check method of noise fi lter circuit board
Normal
Is the voltage of main incoming power
208/230V±10% AC ?
*Check the breaker and power supply
Is the voltage of CNAC (RED) on multi
board CNAC (RED)
208/230V±10% AC?
*Check wiring
*Replace noise filter board
Is the voltage of CNDC(PNK) on multi
board 280-350V DC?
*Check wiring
*Check power board,
*
To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
Yes
Yes
YesYes
No
No
No
Is the voltage between M1 and M2 on
TB3 (M-NET transmission) 24-30V DC?
*Check wiring
*Check M-NET power board
*Check noise filter board
No
Turn off the incoming power supply
and check the resistance of RS1 on
the Noise filter board. *1
RS1=open?
Yes (open)
*Replace Noise filter board and check
52C-relay,wiring,power board and ACTM.
No
(normal)
*1 As for P48NHMU
(1)
, 52C-relay and RS
are not mounted on noise filter circuit board.
Noise filter circuit board check
Yes
208/230V
±10% AC
Power circuit board
CNDC
(PNK)
NO LO
conv.
circuit
Noise filter circuit board
280-350V DC
208/230V
±10% AC
Multi controller board
CNAC2(RED)
21
M-NET power board
CNAC1(WHT)
531
31
208/230V ±10% AC 208/230V ±10% AC
To multi controller board
CNDC(PNK)
RS1(resistor) *1
52C(relay) *1
12V DC from multi
board CNLVB
*1 As for P48NHMU
(1)
, 52C-relay and RS
are not mounted on noise filter circuit board.
Circuit diagram
L2
L1
TB1