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| FILE NO. |
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No. | Part name |
| Checking procedure |
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1 | Electrolytic capacitor | 1. Turn OFF the power supply breaker. | |
| (For boost, smoothing) | 2. Discharge all three capacitors completely. | |
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| 3. | Check that safety valve at the bottom of capacitor is not broken. |
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| 4. | Check that vessel is not swollen or exploded. |
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| 5. | Check that electrolytic liquid does not blow off. |
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| 6. | Check that the normal charging characteristics are shown in continuity test by |
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| the tester. |
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| side | C12 C13 | C14 | Case that product is good |
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| IGBT |
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| Pointer swings once, and returns |
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| sink |
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| slowly. When performing test |
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| once again under another | ||
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| polarity, the pointer should return. | ||
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| Heat |
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| Soldered |
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| surface |
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| C12, C13, C14 → | 500μF |
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2 | Diode block | 1. Turn OFF the power supply breaker. |
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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 | + |
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| Tester rod | Resistance value | |||
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| + | – | in good product |
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| ~ 2 |
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3~ |
| ~2 | + ~ ~ – | + 1 |
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| ~ 3 | ∞ | ||||||
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| 1 2 3 4 | – 4 | ~ 2 | |
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– | 4 |
| (DB01) | ~ 3 |
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10 to 20 Ω when the multimeter probe is reversed
– 91 –