Hitachi UTOPIA RAS-4HVRP2E Service Manual page 161

8 Electrical checks of main parts
Inverter

IPM Circuit of Driver Board (In case of using Digital Tester)
• The positive side (+) of tester: Red; The negative side (-) of tester: Black.
• Pre-charge circuit of the Inverter PCBA. If the positive side (+) of tester is connected to DCL1, and the negative side
(-) of tester is connected to CN28(P).
1 If the resistance is about 1k Ohm, it is OK.
2 If the resistance is about 0 Ohm or infinity, it is damaged.
Test Point
(+)DCL2, (-)R
(-)DCL2, (+)R
(-)CN28(N), (+)R
(+)CN28(N), (-)R
(+)DCL2, (-)S
(-)DCL2, (+)S
(-)CN28(N), (+)S
(+)CN28(N), (-)S
(+)DCL2, (-)T
(-)DCL2, (+)T
(-)CN28(N), (+)T
(+)CN28(N), (-)T
(+)CN28(P), (-)U0
(-)CN28(P), (+)U0
(-)CN28(N), (+)U0
(+)CN28(N), (-)U0
(+)CN28(P), (-)V0
(-)CN28(P), (+)V0
(-)CN28(N), (+)V0
(+)CN28(N), (-)V0
(+)CN28(P), (-)W0
(-)CN28(P), (+)W0
(-)CN28(N), (+)W0
(+)CN28(N), (-)W0
159 SMGB0136 rev.0 - 07/2021
Analog Tester Result
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
More than 100k Ohm
More than 1k Ohm
Digital Tester Result
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
Overload
0.5V or smaller
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