Mitsubishi Electric PUZ-A12NKA7 Service Manual page 54

10-6-2. Check method of outdoor controller circuit board
PUZ-A24NHA7
PUZ-A24NHA7-BS
PUY-A24NHA7
PUY-A24NHA7-BS
Outdoor controller circuit board check
Fuse check
Check the fuse on outdoor controller circuit board.
Did the fuse (F1 and F2) blow?
No
Did the fuse (F3 and F4) blow?
No
Is LED1 or LED2 lit?
Yes
(lit)
LED1
LED1: lit
LED2: lit
Normal
Power circuit board
280–380 V DC
1
3
Conv.
Circuit
CNDC
(PNK)
208/230 V AC ± 10%
1
3 CNAC1
(WHT)
1
3 CNAC2
(RED)
208/230 V AC ± 10%
LI NI
L1 N2
TB1
208/230 V AC ± 10%
OCH636A
PUZ-A30NHA7
PUZ-A30NHA7-BS
PUY-A30NHA7
PUY-A30NHA7-BS
Yes (blow)
Yes (blow)
No (No lit)
Check the voltage from the power circuit
board to CNDC(PNK) connector.
LED2
280 to 380 V DC?
• Check wiring.
• Replace outdoor controller circuit board.
Outdoor controller circuit board
CNDC (PNK)
F1
F2
F2 F2
PUZ-A36NKA7
PUZ-A36NKA7-BS
PUY-A36NKA7
PUY-A36NKA7-BS
Check the indoor controller board wiring.
Check the wiring for SV1 and 21S4*.
No
Yes
• Check the breaker and main incoming power.
• Check noise filter circuit board.
• Check wiring.
F3
F4
CNAC (WHITE)
54
PUZ-A42NKA7
PUZ-A42NKA7-BS
PUY-A42NKA7
PUY-A42NKA7-BS
*21S4 is for PUZ only.