Hitachi mini-HNRQ1 Series Service Manual page 114

(3) Inverter Part of Outdoor Unit PCB
● Detail of Check Points
CAUTION
!
● Check whether the high voltage still exists in the inverter PCB after power is disconnected. When the unit
is operated, LED5 is turned ON. At the time of powering off the unit, LED5 is turned OFF. In this case, the
residual voltage is less than DC50V.
● If LED5 is turned ON while powering off the unit, please wait for about five minutes, LED5 will turn OFF.
CN42
PCN30
PCN8
LED5
FU3
107
TROUBLESHOOTING
P
U
V
W
L1
AC-L1
L-COM
N
L2
AC-N
AC-L