Hitachi RAS-(4-12)HNP(1)(E) - ACT Circuit of Inverter PCB

8 Troubleshooting
304
SMGB0087 rev.0 - 12/2013
1 Touch [+] side of the tester to DIP-IPM 52C terminal,
and [-] side to DIP-IPM R, S and T terminals to meas-
ure the resistance. Normal if all three terminals have
1 kΩ or greater.
2 Contrary to [1], touch [-] side of the tester to DIP-IPM
52C terminal, and [+] side to DIP-IPM R, S terminals
to measure the resistance. Normal if all three termi-
nals have 100 kΩ or greater.
3 Touch [-] side of the tester to [-] side of DIP-IPM DMI
(soldered part), and [+] side of the tester to DIP-IPM
R, S terminals to measure the resistance. Normal if all
three terminals have 1 kΩ or greater
4 Contrary to [3], touch [+] side of the tester to [-] side
of DIP-IPM DMI, and [-] side of the tester to DIP-IPM
R, S terminals to measure the resistance. Normal if all
three terminals have 100 kΩ or greater.
Contact with specied terminals
to measure.
Tester
5 Touch [+] side of the tester to [P] of DIP-IPM (soldered
part), and [-] side to DIP-IPM U, V, W terminals to
measure the resistance. Normal if all three terminals
have 1 kΩ or greater.
6 Contrary to [5], touch [-] side of the tester to [P] of
DIP-IPM (soldered part), and [+] side to DIP-IPM U,
V, W terminals to measure the resistance. Normal if
all three terminals have 30 kΩ or greater. (Resistance
gradually increases during measurement.)
7 Touch [-] side of the tester to [N] of ISPM (soldered
part), and [+] side to ISPM U, V, W terminals to meas-
ure the resistance. Normal if all three terminals have
1 kΩ or greater.
8 Contrary to [7], touch [+] side of the tester to [N]
ofDIP-IPM (soldered part), and [-] side to DIP-IPM U,
V, W terminals to measure the resistance. Normal if
all three terminals have 30 kΩ or greater. (Resistance
gradually increases during measurement.)
Contact with specied terminals
to measure.
Tester
ACT circuit of inverter PCB
Internal circuit of ACT part of inverter module
Non-faulty if [9] – [13] are checked and satised.
(Measure with 1 kΩ range of a tester.)
External Appearance and Internal Circuit of
Transistor Module
N O T E
DO NOT use a digital tester.