Hitachi RAS-4-HNCE - Page 293

8. Troubleshooting
279
SMGB0079 rev.0 - 01/2013
8
• 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.
9 Check items [1] – [8].
10 Touch [+] side of the tester to DIP-IPM DCL2 terminal,
and [-] side to [P] of ISPM/DIP-IPM (soldered part) to
measure the resistance. Normal if all three terminals
have 100 kΩ or greater
11 Contrary to [10], touch [-] side of the tester to DIP-IPM
DCL2 terminal, and [+] side to [P] of DIP-IPM (solde-
red part) to measure the resistance. Normal if all three
terminals have 1 kΩ or greater.
12 Touch [+] side of the tester to DIP-IPM DCL2 terminal,
and [-] side to [N] of DIP-IPM (soldered part) to mea-
sure the resistance. Normal if all three terminals have
100 kΩ or greater.
13 Contrary to [12], touch [-] side of the tester to DIP-
IPM DCL2 terminal, and [+] side to [N] of DIP-IPM
(soldered part) to measure the resistance. Normal if
all three terminals have 10 kΩ or greater. (Resistance
gradually increases during measurement.)
Contact with specied terminals
to measure.
Tester
• Checking Method of Resistance for Inrush Current Prevention (Built-in Thermal Fuse)
(Measure the resistance under 1 kΩ range of a circuit tester.)
N O T E
DONOTuseadigitaltester.
By placing the
+
side of tester to the
+
side of DM1
(soldering portion) on inverter PCB and the
-
side of
tester to DCL1 on inverter PCB, measure the resistance.
If the resistance is around 500Ω, it is normal. If the resis-
tance is 0Ω or innity Ω, it is abnormal.
DM1 -
DCL1
Circuit
Tester
Place wires to
specified terminal.
+
-
Refer to (1)
“Detail of Check Points”
about details.
Contact with specied terminals
to measure.
Tester