Act Circuit Of Inverter Pcb - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
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.
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.)
ACT circuit of inverter PCB
Internal circuit of ACT part of inverter module
Non-faulty if [9] – [13] are checked and satisfied.
(Measure with 1 kΩ range of a tester.)
N O T E
DO NOT use a digital tester.
304
SMGB0087 rev.0 - 12/2013
Contact with specified terminals
to measure.
Tester
Contact with specified terminals
to measure.
Tester
External Appearance and Internal Circuit of
Transistor Module