45
Installation and Maintenance
Service Manual
●Outdoor unit:
Key detection point
"Test point NO."
Test point
Related elements
Test value under normal condition
Test 1
Between A and C
Neutral wire ,live wire
160V-265V
Test 2
Between B and C
Neutral wire ,live wire
160V-265V
Test 3
Between D and E
Electrolytic capacitor of DC bas bar
DC 180V-380V
Test 4
Between F and G
Electrolytic capacitor of switch power
DC 180V-380V
Test 5
Both ends of diode D59
D59(IPM 15V)
DC 14.5V-15.5
Test 6
Both ends of electrolytic
capacitor C47
C47(+12V power)
DC 12V-13V
Test 7
Both ends of electrolytic
capacitor C60
C60(+5V power)
DC 5V
Test 8
Both ends of electrolytic
capacitor C73
C73(+3.3V power)
DC 3.3V
Test 9
Between S and T
Communication circular current
DC 56V
Test 10
Between point N and GND
C50 to N terminal (ground) (signal receiving terminal of
outdoor unit)
Jumping between 0V and 3.3V
Test 11
U7
Between 1 and 2 at leading foot of U7
Jumping between 0V and 3.3V
Test 12
Between point M and GND
R77 to N terminal (ground) (signal receiving terminal of
outdoor unit)
Jumping between 0V and 3.3V
Test 13
U8
Between 3 and 4 at leading foot of U8
Jumping between 0V and 3.3V
