K8400 Err: MAXTEMP

Vertex 3D Printer Vertex - Assembly and user manual
21

[quote=“rj1”]As you see on the picture below I put a 100k resistor at the hotend and i still get zeros on the lcd :-([/quote]When you put it in there it still can be a cable issue. Connect it directly on the various therm inputs on the controller board (therm1 therm 2 and bed-therm). One of them at least should work.
NB : your resistor looks like a 10K?

22

Hi raby

how are you today ?

i did as you told me with ext1-therm, ext2-them and bed-therm and i get everytime only zeros on the LCD:

k8400_100k_resistor_mainboard.jpg5312×2988

BTW: this is a 100k 1% resistor as you check the color code ( brown, black, black, orange, brown )

again: [quote]can i check anything on the mainboard, or is there any posibilty to debug the software?[/quote]

thanks for you help

23

I’m a bit clueless here… The board is functioning as you get the LCD displaying the usual messages.

Did you load the firmware with an Arduino 1.0.6 (and not 1.6.x)?
Does the printer connect to Repetier? If so, when connected check in “Config” the "Firmware EEPROM Configuration. Are all the values loaded?

24

So am I :frowning:

  • yes with Arduino 1.0.6 and not with 1.6.5
  • yes, I can connect the printer within RepetierHost.
  • and yes, I think all values are loaded.

and there is a screen “Temperature Curves” where I see only flat lines 0° :frowning:

are there different mainboards? like revision 1 or something?

25

This looks like a difficult one.
Anyway, it looks like you have gone through all your options.
We can offer inspection/repair/exchange if you return the board.

Please return it together with a detailed fault description to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

26

Hi VEL417

I hope you understand that, before I’ll send the mainboard to Belgium and wait for another month, I would like to check the mainboard with you.

And here I send you a picture of mine. I have marked 2 spots where I think there might be a soldering problem:

k8400_mainboard.jpg3930×2794

1.) There is a connection between DZ4 and R61 where I think that shouldn’t been there! right?
2.) There I see 2 times a connections between 2 pins, where i’m not sure if this is ok? But since this is the FTDI chip I think this can’t be the problem, right?
3.) Silly question :slight_smile: the z-diodes DZ4, DZ5 & DZ6 aren’t there! I guess this is ok, right?
4.) Can you send me an picture of a good mainboard? So I can check the directions of the diodes?

Thanks for your help
Jan

27

Hi Jan,

I have the same solder bridges in the ftdi chip and my printer does not have your problem, so I guess you can rule that one out.

Dz4 ,5 and 6 are also missing on mine.

R61 and dz4 are not connected on mine, I did check with a multimeter.
On the top left corner on r61 is a small pad that goes to the back side of the board, but that pad does not connect to dz4 on mine.

28

I cut the solder-bridge from DZ4 to R61 and now it works :slight_smile:

many thanks to all that have helped me!!!

cheers jan

29

Thanks for the info, this issue has not been reported before.
Sorry for the inconvenience.

30

Hi rj1 and VEL417,

Could you please explain with pictures how to fix this problem. After assembling the printer overhours after work I faced the same problem.

Resolution seems to be simple to apply, and as rj1, I wouldn’t like to wait for new driver for so long time.

Thanks in advance for help. I really appreciate.

31

Hello , I has given me that problem , solve it by placing the thermistor in the center of the plate.

Take the TEMPERATURE SENSOR and slide it through the HEATER BLOCK until the sensor itself (you can feel a small bump through the sleeve where the sensing part is) is at the centre of the HEATER BLOCK.

Make extra sure that the sensing part is inside the hole of the HEATER BLOCK as the nozzle can self destruct if the sensing part is not inside.

32

Can you let me know what exactly I should check ?

Can you mark that on picture ?


Thanks in advance

33

He means the white cable which is the thermistor (sensor that tells you how hot your hotend is)
If you remove it out of your heatblock, you can feel somewhere in the middle of the cable a small bump, the piece that is a bit bigger is actually the sensor and you need to make sure that that piece is in the heaterblock, and not outside…
Then your sensor won’t detect the temperature that well and give you a wrong temperature.

34

Your thermistor is screwed in the wrong holes.
Next to the connector you see HH SS -+
which means the Sensor terminal is in the middle.