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For metal button switches, during the entire application process, if the light does not light up, this problem needs to be solved immediately to avoid hidden dangers. So how to solve the problem that the indicator light of the metal button switch does not light up? Let’s introduce it to you below.  In different household appliance workplaces, because the circuit line control circuit is very long, the indicator light is not very bright, mostly caused by induced voltage. 1. Insert a small volume size 0.01_0.... more