One of the biggest problems that I see that is asked about is power. Tevo ships a very nice power supply with the unit but the biggest problem is most times the input power switch is not checked before installation. When this happens all kinds of problems arise.
On the side of the power supply is a switch to allow 220v or 110v. If you are in the US then you want it selected to 110v. Check this before you do anymore diagnostics on your Black Widow. This will clear up around 75% of the problems if you are having them.
The next problem is the voltage output (remember when I said you should have a nice multimeter?)
There is a small organge screw adjustment were it says +V ADJ. Check the V+ and V- with a multimeter and see if it is at 24V with nothing working at the time. Use the adjuster screw to make sure you are at 24 volts. If you cannot attain this voltage look at the image above and verify that you have your power supply set for the input voltage of your country!
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