Hitachi FSG Series Service Manual page 100

1
TROUBLESHOOTING
92
c. By touching the - side of the tester to the N terminal of
transistor module and the + side of tester to U, V and W
of transistor module, measure the resistance. If all the
resistances are from 1 to 5 kW, it is normal.
e. By touching the + side of the tester to the N terminal of
transistor module and the - side of tester to U, V and W
of transistor module, measure the resistance. If all the
resistances are greater than 100 kW, it is normal.
n Checking Procedures on Diode Module
Outer Appearance and Internal Circuit of Diode Module
[Case1]
[Case2]
If items (a) to (d) are performed and the results are
satisfactory, the diode module is normal.
Measure it under 1 kW range of a tester. Do not use a digital
tester.
a. By touching the + side of the tester to the + terminal of
the diode module and the - side of tester to the ~
terminals (3 NOs.) of the diode module, measure the
resistance. If all the resistances are from 5 to 50 kW, it is
normal.
c)
d)