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Check method of multi controller board
Normal
LED1 LED2
Fuse check
Check the fuse on Multi controller board
Did the fuse (F500) blow?
Replace Multi board and fan motor.
*See DC fan check
Did the fuse (F1 and F2) blow? Check theSV1and21S4andwiring.
7seg LED is lit?
(SW1 : all off)
280V to 350V DC?
*Check wiring
*Replace multi controller board
*Check the breaker and main incoming power
*Check noise filter board
*Check wiring
Check the voltage from the power board
to CNDC(PNK) connector.
No
No
Yes
(lit)
No (No lit)
Yes
No
Multi controller board check
Yes (blow)
Yes (blow)
Noise filter circuit board
CNAC2(RED)
208/230V
±10% AC
LI
NI
208/230V
±10% AC
CNDC (PNK)
Power circuit board
3
-
1
CNDC
(PNK)
LO
NO
NO LO
conv.
circuit
Multi controller board
280-350V DC
208/230V
±10% AC
31
CNAC (RED)
F1
F2
F500
208/230V ±10% AC
L1
L2
TB1