輸出整流管並聯的RC,在高溫燒機時,C破裂?

輸出整流管並聯的RC,在高溫燒機時,C破裂?
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當D7用SB2210時,C8破.
當D7用SB2100時,機台OK.
燒機電壓230Vac/50Hz,輸出負載0.5A12V.
請高手指點!