Service manual

41
10-7. Test point diagram and voltage
1. Outdoor electronic control P.C. board
MUZ-GA50VA - MUZ-GA60VA - MUZ-GA71VA -
E1E1E1
LED 1
LED 2
CN801
325V DC
~
370V DC
Input
(
(
CN932 20-90V AC
GND
5V
5V DC pulse wave
(
To fan motor
Defrost thermistor (RT61)
Discharge temperature thermistor (RT62)
Outdoor heat exchanger temperature thermistor (RT68)
(
(
(+) (–)
(+)
Rush current relay
(–)
R.V. coil (–)
(
12V
DC
15V 15V
(+)
(–)
CN931
(
CN661
CN701 Signal transmission (To power board) 5V DC pulse wave
(+)
(–)
(
GND
CN702 Signal reception
(From power board) 5V DC pulse wave
GND (power board)
CN781
CN795 12V DC pulse wave
LEV
(
(
( ( (
-20 -10 0 10 20 30 40
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80
200
180
160
140
120
100
80
60
40
20
0
Resistance (k’ )
Resistance (k’ )
Temperature (;)
Temperature (;)
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Fin temperature thermistor (RT64)
0 10 20 30 40 50 60 70 80 90 100 110 120
700
600
500
400
300
200
100
0
Resistance (k')
Temperature (;)
Discharge temperature thermistor (RT62)
F801
FUSE
3.15A/250V
(
Ambient temperature thermistor (RT65)
CN663
Serial signal
Room A
5~10V DC
CN601
230V AC
50 Hz
Input
High pressure switch
MUZ-GA71VA CN681
(
(
OB389 --2qxp 05.1.26 18:15 Page 41