Hitachi RAM-60QH4 Manuel De Service page 144

HOW TO CHECK POWER MODULE
Checking power module using tester
Set tester to resistance range (×100)
If indicator does not swing in the following conductivity check, the power module is normal.
(In case of digital tester, since built-in battery is set in reverse direction, + and - terminals are reversed.)
!
CAUTION
If inner circuit of power module is disconnected (open), the indicator of tester will not swing and this may
assumed as normal. In this case, if indicator swings when + and - terminals are connected in reverse of
diagram below, it is normal. Furthemore, compare how indicator swings at U, V and W phases. If indicator
swings the same way at each point, it is normal.
P1 N1
L2 L1
P2 U
1 5
W V
P1
L2 L1
– 156 –
N1 P2 U
1 5
W V