[GUIDE] Checking power supply – how to do it

In this very short guide we will discuss the checking power supply for the correct functioning of our 3d printer. Obviously the guide can be extended to any type of power supply of any object that works with electric current.

We must start by saying that the electronics of some 3D printers is not as accurate as it should be because although it is a fundamental part it plays its role in the shadow of belts, pulleys, motors and frames.
This poor quality of electronics very often results in sudden failures, and often what we have to do is to verify what has failed and the reasons that led to the failure.

Checking power supply

When we are faced with an electronic failure, we have to find out which part creates the problem, whether the power supply or the motherboard. Given the difficulty of looking for malfunctions in the electronic board we will be forced to proceed by trial and error: The first and simplest is the verification of the power supply.

The only necessary tool: a digital multimeter (tester).

First we will have to learn how to read the outputs of the power supply:

Checking the power supply








Checking the power supply

N  = Neutral input, conventionally the cable is used in blue color

L   = Phase input, the phase conventionally uses brown-brown cable

= Ground, the ground conventionally uses the cable of the colors yellow and green

V+ = Positive pole output, where we will have to connect our red cable

V- = Negative pole output, where we will have to connect our black cable

Checking power supply: What to do

To check, the power supply must be connected to the home power supply, without anything being connected to it.

The multimeter must be set to Volt current condinuous () and on the correct scale, to test power supplies from 12v or 18v we will have to set 20v, for those from 24v or 48v we will set 200v.

Now we simply have to place the red tip on the screw corresponding to V+ and the black tip on V-.  Even if we were wrong and reversing the tips will not happen anything, only on the monitor will appear a minus. The value we have to read is the nominal output value of the power supply, only a deviation of about 0.2v is permissible.

Checking the power supply

If we read another value or did not receive any signs of life, it means that the power supply is to be replaced.
The photo shows the test of a 24v power supply on the monitor.

You just have to be careful not to test the input with this method, the 220v current could electrocute the multimeter as well as emitting a small burst.

Does your power supply work well? If not, switch to a new one before your printer is damaged by electronics or mechanics!

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