Hitachi RPI-0.8FSG1 Service Manual page 123

(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 kΩ, it is normal.
(d) 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 kΩ, it is
normal.
(3) Checking Procedures on Diode Module (In Case of 5 to 20HP)
Outer Appearance and Internal Circuit of Diode Module
[Case 1]
[Case 2 and 3]
If items (a) to (d) are performed and the results are satisfactory, the diode module is normal.
Measure it under 1 kΩ 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 kΩ, it is normal.
(b) 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 greater than
500 kΩ, it is normal.
+
TROUBLESHOOTING
P
B
U
N
V
W
P
B
U
N
V
W
+
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