Toshiba RAS-18SKV-E Service Manual page 85

11-9-5. Checking Method for Each Part
No. Part name
1 Electrolytic capacitor
(For boost, smoothing)
2 Diode block
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 → 18SAV-E :500μF/400V, 22SAV-E : 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
– 84 –
Checking procedure
Pointer swings once, and returns
slowly. When performing test
once again under another
MCC-5009
polarity, the pointer should return.
Soldered
surface
Tester rod
+
~
2
~ ~
–
~
3
4
–
4
(DBO1)
10 to 20 Ω when the multimeter probe
is reversed
Case that product is good
Resistance value
in good product
–
+
1
∞
~
2
~
3