– 98 –
10-8-5. Checking Method for Each Part
No.
1
Part name
Electrolytic capacitor
(For raising pressure,
smoothing)
Checking procedure
1. Turn OFF the power supply breaker.
2. Discharge all four capacitors completely.
3. Check that safety valve at the bottom of capacitor is not broken.
4. Check that vessel is not swollen or exploded.
5. Check that electrolytic liquid does not blow off.
6. Check that the normal charging characteristics are shown in continuity test
by the tester.
2
3
C12, C13, C14, C15 → 500µF/400V
1. Turn OFF the power supply breaker.
2. Discharge all four capacitors completely.
3. Check that the normal rectification characteristics are shown in continuity
test by the tester.
1. Turn OFF the power supply switch.
2. Discharge all four electrolytic capacitors completely.
3. Execute continuity test with a tester.
Converter module
IGBT module
Case that product is good
Pointer swings once, and
returns slowly.
When performing test once
again under another polarity,
the pointer should return.
MCC-1359
Soldered
surface
Heat sink IGBT side
C10 C11 C12 C13
+ ~ – ~ A
21
+ ~
1
– ~
2
A
Mark
E G
E G
Resistance value
in good product
Diode check
Tester rod
+
–
~
1
~
2
+
–
~
1
~
2
E
~
1
~
2
50k or more
(0
in trouble)
IGBT check
Resistance value
in good product
50k
or more
(0
in trouble)
Tester rod
+ –
~
2
G
E
E
Tester rod
UVW UVW
WVUWVU
1M
or more
100k to 300k
200k to 300k
Case that product is good
BZ BY BX BW
BW
BZ
BV BU
+
+
+
–
+
+
–
–
–
–
W V U
W
BV
BY
V
BU
BX
U
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