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CC1120 焊接问题

Other Parts Discussed in Thread: CC1120

CC1120在焊接好,只有温度高时才能正常工作,焊接好后用风枪隔着电路板在CC1120的后面稍微加热后能正常工作,待冷却到室温时不能工作,再次加热后又能正常工作,这是什么原因呢?