Service manual

43
11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor electronic control P.C. board
MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA
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
(
(
(
( (
-20-100 10203040
100
90
80
70
60
50
40
30
20
10
0
0 1020304050607080
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 102030405060708090100110120
700
600
500
400
300
200
100
0
Resistance (k')
Temperature (;)
Discharge temperature thermistor (RT62)
F801
FUSE
250V 3.15A
(
Ambient temperature thermistor (RT65)
CN663
Serial signal
Room A
5~10V DC
CN601
230V AC
Input
CN681
High pressure switch
MUZ-GA60VA-
MUZ-GA71VA
E3
(
(
(
OB389F--2qxp 07.9.3 5:08 PM Page 43