Outdoor Control P.c. Board - Mitsubishi Electric MXZ-2B20NA Service Manual

2. Outdoor control P.C. board

MXZ-5B42NA
CN781
to outdoor power P.C.
board
(
CN701
to outdoor power P.C.
Signal transmission
board
Signal reception
F930 FUSE
T3.15AL250V
CN801 to outdoor power
P.C. board
325 - 350V DC Input
F801 FUSE
T3.15AL250V
SW1
SW2
SW871
CN881
to outdoor power P.C.
board
18V DC
17V DC
LED 3
LED 2
LED 1
(
Defrost
thermistor (RT61)
Discharge temperature
thermistor (RT62)
CN661
Outdoor heat exchang-
er temperature
thermistor (RT68)
CN681
High pressure switch
OBH560G
Discharge temperature thermistor (RT62)
700
600
500
400
300
200
100
0
0 10 20
(
X64A
X64B
12V DC
GND
LEV: 12V DC pulse wave
30 40 50 60 70 80 90 100 110 120
Temperature (°C)
325-350V DC
CN931 to fan moter
15V DC
0~15V DC
15V DC pulse wave
CN663 Ambient temp thermistor (RT65)
CN711
to outdoor power
P.C. board
208/230V AC
Input
77
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
100
90
80
70
60
50
40
30
20
10
0
-20 -10 0 10 20
Temperature (°C)
Serial signal Room E
Serial signal Room D
Serial signal Room C
Serial signal Room B
Serial signal Room A
Terminal block (S2)
Terminal block (S1)
CN713 Valve coil
208/230V AC Output
CN712 R.V. coil
208/230V AC Output
F711 FUSE
T3.15AL250V
30 40
CN631
)
signal to
indoor
unit
CN611
)
signal to
indoor
unit
)
CN601
signal to
indoor
unit