Toshiba RAS-B10EKVP-E Service Manual page 82

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11-9-5. Checking Method for Each Part
No. Part name
1 Electrolytic capacitor
(For boost, smoothing)
2
Diode block
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1. Turn OFF the power supply breaker.
2. Discharge all three 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.
C12 C13 C14
C12, C13, C14 → 760µF/400V
1. Turn OFF the power supply breaker.
2. Completely discharge the four electrolytic capacitors.
3. Remove the diode block from the PCB (which is soldered in place).
4. Use a multimeter with a pointer to test the continuity, and check that the
diode block has the proper rectification characteristics.
+
1
~ ~
~ ~
+ –
3 2
1 2 3 4
(DBO1)
–
4
– 82 –
Checking procedure
Case that product is good
Pointer swings once, and returns
slowly. When performing test
MCC-5009
once again under another polarity,
Soldered
the pointer should return.
surface
Tester rod
Resistance value
in good product
+ –
~
2
+
~
∞
1
3
~
2
–
4
~
3
10 to 20 Ω
when the
multimeter
probe is
reversed