Mitsubishi Electric MXZ-2D33VA, Service Manual

Page: 156 / 538

156
2. Outdoor control P.C. board
LED 1
LED 2
CN801
Bus-bar
voltage
325 - 370
VDC Input
(
LEV Room A
(
12 VDC pulse wave
(
LEV Room B
(
12 VDC pulse wave
(
LEV Room C
(
12 VDC pulse wave
(
LEV Room D
(
12 VDC pulse wave
(
High pressure switch
Defrost thermistor (R
T61)
Discharge temperature thermistor (R
T62)
Outdoor heat exchanger temperature thermistor (R
T68)
(
(
(+)
(–)
(+) (–)
(
CN661
Signal transmission (T
o power P
.C. board)
5 VDC pulse wave
LEV E
(
(+) (–)
(
(+)
(–)
(
(+) (–)
(
(+) (–)
(
CN791 CN792 CN793 CN794
( ( (
F801
FUSE
T3.15AL250V
(
Ambient temperature thermistor (R
T65)
CN665
Serial signal Room D
12 - 24 VDC
Serial signal Room C
12 - 24 VDC
Serial signal Room B
12 - 24 VDC
Serial signal Room A
12 - 24 VDC
CN631
CN621
CN611
CN601
Input
SW2
CN795 12 VDC pulse wave
-20 -10 0 10 20 30 40
100
90
80
70
60
50
40
30
20
10
0
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Temperature (°C)
Resistance (k
Ω
)
MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA
CN701
15V 15V (+)
(–)
(
Signal reception (From power P
.C. board)
5 VDC pulse wave
CN702
F930
FUSE
T3.15AL250V
CN931
To Fan motor
CN931 Bus-bar voltage 325 - 370 VDC Input
V
FG
(Rotate signal)
(V
oltage between right pins
of PC931, pin 3 and pin 4) (Same as (CN931
(+)-
(
−
))
V
SP
(Rotate
instruction)
(Voltage
between pins of
C930): 0 V DC
(when stopped),
1.8 - 6.5 V DC
15 VDC
230 VAC
CN711
230 VAC
F711 FUSE
T3.15AL250V
CN712
R.V .coil
SW871
LED 3
(–)
CN681 (
MXZ-3D54V
A2-
E3
,
ER3
,
ET3
,
MXZ-3D68/4D72V
A)
Temperature (°C)
Discharge temperature thermistor (RT62)
5HVLVWDQFHNŸ
0
100
200
300
400
500
600
700
800
0 10 20 30 40 50 60 70 80 90 100 110 120
(
MXZ-4D72VA
)
(
MXZ-4D72V
A
)
OBH626K