Mitsubishi Electric MXZ-2C30VA, Service Manual

Page: 111 / 396

111
2. Electronic control P.C. board
LED 1
LED 2
Bus-bar
voltage
CN801
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
CN932 20-90 V
AC
GND
5V
5 VDC pulse wave
(
To fan motor
Defrost thermistor (R
T61)
Discharge temperature thermistor (R
T62)
Outdoor heat exchanger temperature thermistor (R
T68)
(
(
(+) (–)
(+)
Rush current relay
(–)
R.V
. coil (–)
(
12V DC
15V 15V
CN931
(+) (–)
(
CN661
Signal transmission (T
o power board)
5 VDC pulse wave
(+) (–)
(
GND
Signal reception (From power board) 5 VDC pulse wave
GND (power board) CN781
LEV E
(
(+) (–)
(
(+)
(–)
(
(+) (–)
(
(+) (–)
(
CN791 CN792
CN793
CN794
CN681 (
MXZ-3C68/4C71V
A)
( ( (
F801
FUSE
T3.15AL250V
LED 3
(
Ambient temperature thermistor (R
T65)
CN663
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
CN604
CN603
CN602
CN601
230 VAC
Input
SW1
CN795 12 VDC pulse wave
0 10 20 30 40 50 60 70 80 90 100 110 120
700
600
500
400
300
200
100
0
Resistance (k
Ω
)
Temperature (°C)
Discharge temperature thermistor (RT62)
-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-3C54VA MXZ-3C68VA MXZ-4C71VA
CN701
CN702
DM00Y765
OBH584G