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hello. i know this might be answered on the mth forum but i will try here first. my tiu is powered by 4 180 watt bricks and when i shut the power off to fixed voltage in1 i still have power going out from fixed voltage in2. all the other outputs have no voltage. is there something wrong? 

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There are 2 ways to power a TIU, using it's Aux Power port or powering the Fixed 1 input. 

You killed the power to your TIU by shutting power off to the Fixed 1 input. With separate power to all your TIU ports you should be using the TIU's Aux port to power your TIU. As you can see you lose control of the other channels when your Fixed 1 brick is shut off or it's breaker trips.

A Z500 brick from an MTH starter set is a good option for powering the TIU's Aux port. That's what I've been using for several years.  

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