Check Method Of Multi Controller Board - Mitsubishi Electric City Multi PUMY-P36NHMU Technical & Service Manual

Check method of multi controller board

Multi controller board check
Fuse check
Check the fuse on Multi controller board
Did the fuse (F500) blow?
No
Did the fuse (F1 and F2) blow?
No
7seg LED is lit?
(SW1 : all off)
Yes
(lit)
LED1
Normal
Power circuit board
280-350V DC
3
-
1
conv.
CNDC
circuit
(PNK)
NO LO
208/230V
±10% AC
Yes (blow)
Yes (blow)
No (No lit)
Check the voltage from the power board
to CNDC(PNK) connector.
LED2
280V to 350V DC?
*Check wiring
*Replace multi controller board
CNDC (PNK)
F500
F1
F2
Noise filter circuit board
LO
NO
61
Replace Multi board and fan motor.
Check the SV1 and 21S4 and wiring.
No
Yes
*Check the breaker and main incoming power
*Check noise filter board
*Check wiring
Multi controller board
CNAC (RED)
208/230V ±10% AC
208/230V
3 1
CNAC2(RED)
±10% AC
*See DC fan check
208/230V
±10% AC
LI
L1
NI L2
TB1