Mitsubishi Electric MXZ-3E54VA-E1 Service Manual page 101

11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor control P.C. board
MXZ-3E54VA MXZ-3E68VA
MXZ-4E72VA
MXZ-4E83VAHZ -
V (Rotate signal)
FG
(Voltage between
right pins of PC931,
pin 3 and pin 4)
(Correspond to
(CNF1 (+)- (−))
V (Rotate instruction)
SP
(Voltage between pins
of C930): 0 V DC
(when stopped),
1.8 - 6.5 V DC
(when operated)
(Same as
(CNF1 (+)- (−))
CNF1
To fan motor
Bus-bur voltage
290 ~ 370 V DC
15 V DC
CNDC
Bus-bur
voltage
290 ~ 370
V DC
CN63H
High
pressure
switch
OBH723D
,
230 V AC
E1 ER1
Input
CN741
Signal translation
(To Communication
CN601
adaptor board)
Serial signal 12 ~ 24 V
Room B Room D
Room A Room C
CN611
LEV: 12 V DC
pulse wave
101
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
100
90
80
70
60
CN621 50
40
30
20
10
0
-20 -10
Thermistor R25 = 10 kΩ ± 2%
B constant = 3950 ± 2%
Rt = 10exp{3950(
F711 FUSE
T3.15AL250V
CNAC
to outdoor power P.C.
board 230 V AC
Input
CN714 Defrost heater
230 V AC
Output
CN713 Valve coil
230 V AC
Output
MXZ-4E83VAHZ
CN712 R.V. coil
230 V AC
Output
CNTH2
Ambient temperature
thermistor
(RT65)
CNTH1
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Defrost thermistor
(RT61)
SW1
SW871
SW2
LED3
LED2
LED1
Discharge temperature thermistor (RT62)
800
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature( )
Thermistor R100 = 13.36 kΩ ± 2%
B constant = 4014 ± 2%
Rt = 13.36exp{4014(
0 10 20 30 40 (ºC)
Temperature
1 1
)}
273+t 298
1 1
)}
273+t 373