Hitachi RAS-5HVRNM1E Service Manual page 325

8 Troubleshooting
the transistor module is normal. Measure it under 1kΩ range of
a tester. Do NOT use a digital tester.
a. By touching the + side of the tester to the P 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 5kΩ, it is normal.
b. By touching the - side of the tester to the P 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 100kΩ, it is normal.
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 5kΩ, 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 100kΩ, it is normal.
3. Checking method of diode module
Outer appearance and internal circuit of diode module
If items (a) to (d) are performing and the results are satisfactory, the diode module is normal.
Measure it under 1kΩ range of a tester. Do NOT use a digital tester.
a. By touching the + side of the tester to the + terminal of 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 50kΩ, it is normal.
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SMGB0060 rev. 1- 12/2010
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