71
Service Manual
Installation and Maintenance
Test No.
Test point
Corresponding component
Test value under normal
condition
test 1
Between A and C
Neutral wire and live wire
AC 160V~265V
test 2
Between B and C
Neutral wire and live wire
AC 160V~265V
test 3
Between D and E
DC busbar electrolytic capacitor
DC 180V~380V
test 4
Between F and G
Electrolytic capacitor of power C8
DC 180V~380V
test 5
H position, both ends of diode D34
IPM bootstrap circuit diode D34
DC 13.5V~16.5V
test 6
I position, both ends of capacitor
C20
Capacitor C20 of power 12V
DC 12V
test 7
J position, both ends of capacitor
C67
Capacitor C67 of power 15V
DC 15V
test 8
K position, both ends of capacitor
C24
Capacitor C24 of power 5V
DC5V
test 9
L position, both ends of capacitor
C73
3.3V Capacitor C73
DC 3.3V
test 10
From M position to ground
From one end of R61 (M position) to
ground (signal receiving end of outdoor
unit)
0~3.3V
test 11
N, optical coupler U7
U7(3, 4 leading feet)
0~3.3V
test 12
P, optical coupler U8
U8(1, 2 leading feet)
0~3.3V
test 13
From Q point to ground
From one end of R77 (Q position) to
ground (signal sending terminal of
outdoor unit)
0~3.3V
test 14
Between S and T
Capacitor C113 of communication circuit
56V
