Geeetech

Hi,

I have looked at the cable ends for the psu and they look fine, I have attached some pictures as well. I also have a multimeter but am unsure what to test and how to use it. Can you please help?

Thanks

You need to learn how to use the multimeter yourself.
I can suggest that we will need to measure the DC voltage in the range up to 20V. Provided your main power supply supplies 12V.

You will need to know the design of the controller board in order to make measurements. So as to test the main power supply points, and others needed.
So try to look at it carefully.

You will need some point with a ground potential (0V). It would be a good idea to attach one end of the multimeter to this point permanently.
This makes it easier to make measurements. You do not have two hands occupied.
Probably you had no crocodile in the set with the multimeter, just ordinary test tips (spikes).

Earlier you said that you have a GT2560 controller.
That is important. There are other versions, such as GT2560 Rev. A or GT2560 Rev. A+ or GT2560 Rev. B.

The controller board you own has its own "small power supply" built.
It is a step-down inverter that generates 5V0 DC.
In addition, it has redundant components such as a 3V3 and 12V0 DC stabilizer.

For training you would have to find all these points and check the tension.
It is also good to measure the output voltage of the 12VDC mains adapter.

Once you have mastered this range, let us know. We will move on to the next step, where we will measure the two main voltages while the printer is in operation.

We will take the measurements one by one because you have one multimeter.

I greet you warmly.

Hi,

Thanks for all the info, I'll figure out what I'm doing and report back my board is the rev A+

Cheers

Hi,

Is there a schematic available for the GT2560 Rev A+ that I can use as a guide? Otherwise I am basically just guessing which parts to test specifically on the board (other than that obvious connections)

Thanks.

Hi


Yes.

If you were to read the forum, there would be no question.



Please feel free:
http://geeetech.com/forum/search.php?ke ... schematics
Third link, second page.


You put me a beer or a whole crate.

How is the progress

Hi

I have tested pins on the mainboard and got some readings:

Power Supply cable: 12V
USB board connection: 2.04V
Extruder heater: 0.02V
Heatbed heater: 0.02V
Thermistors: 4.97V

I also noticed a red flashing LED on the extruder heater (which doesn't stop flashing during print) once it had reached my desired temperature for printing.

Thanks.

Also when you said to check the tension, did you mean something to do with the resistance?

thanks.

Sstevens2493 wrote: Fri Sep 07, 2018 3:39 pm Hi

I have tested pins on the mainboard and got some readings:

Power Supply cable: 12V
USB board connection: 2.04V
Extruder heater: 0.02V
Heatbed heater: 0.02V
Thermistors: 4.97V
...

The first measurement is clear to me and seems to be correct.
As for the rest, I don't know at which points you measured the voltage. But smaller with that.

Sstevens2493 wrote: Fri Sep 07, 2018 3:39 pm ...
I also noticed a red flashing LED on the extruder heater (which doesn't stop flashing during print) once it had reached my desired temperature for printing.
...

This is the correct symptom. Heating is essential. If the heating had been switched off, the temperature would have fallen quickly.


We can now proceed to the correct diagnosis.

Try to securely and durably attach the measuring tips at the main power connector of the controller board.

Start normal operation by observing the voltmeter indication all the time.
If you notice transmission interference, then look very carefully at the result of the multimeter display.

With a bit of luck you may notice something.

Repeat the experience several times.
Then we will proceed to similar tests at other points.
These will be fuses and a 5V power supply.