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PostPosted: Sun Jul 16, 2017 11:35 am 
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Hi everyone,

After printing ABS for a while (most of the time it failed), I thought it was time to add a heated bed to my vertex k8400.
I bought a mk3 alu heated printbed, and I attached it with a self-made power expander to an external 12v PSU.
Then I noticed that the heated bed wouldn't turn of, so I resoldered the power expander twice, but it didn't help.
I then noticed that the heat bed LED indicator is always on, I checked it with external LEDs and it turned out that
the heated bed output on the main board is always turned on...
I tried re-uploading the firmware but it didn't help.
Have you got any solutions?

Alfredias


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PostPosted: Mon Jul 17, 2017 5:43 am 
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The Marlin firmware the ‘Configuration.h’ file has a line that need
to be changed for the type of thermistor used

https://dl.dropbox.com/s/gsx5zu130azuno ... 3.pdf?dl=0


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PostPosted: Mon Jul 17, 2017 8:20 am 
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Thanks, but I don't think that the thermistor is the problem,
When I plugged the thermistor in it was immediatly recognized and it showed a good temperature reading (the same as the thermistor in the hotend).
The problem is that the heated bed output is always on, no matter what.
When I stop the heated bed in repetier host, it still stays on....
When I unplug the thermistor, the heatbed still stays on....
When I reboot the 3d printer, the heatbed still stays on....

Alfredias


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PostPosted: Mon Jul 17, 2017 2:09 pm 
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Did you make any changes to Marlin firmware the ‘Configuration.h’ file has a line that need
to be changed ? and the Start and End G–code in Cura
according to instructions in link ?

If it is well set, problem is that Power Expander or signal from Motherboard (bad conection)


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PostPosted: Mon Jul 17, 2017 2:25 pm 
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I didn't make any changes to the marlin firmware, because the thermistor I use is the same as in the hotend, so it was
immediatly recognized and gave a good temperature reading. I know that the connection to the power expander is also not the problem because the LED on the mainboard is always on, which indicates that the output of the heatbed on the mainboard is also always on...


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PostPosted: Mon Jul 17, 2017 3:37 pm 
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I think you still have to make changes to the software because it's about power management instead of a thermistor, try it can always reset the settings to the old one, try it according to the instructions

http://www.k8xxx-3dprinters.crimed.be/w ... heated_bed

Here is topic:
viewtopic.php?f=64&t=14714


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PostPosted: Mon Jul 17, 2017 5:02 pm 
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I made the changes to the firmware and the slicer, but it didn't work.
I guess the problem is in the hardware and not in the software, since the firmware should be able to turn the heatbed on and off without making any changes to it....


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PostPosted: Mon Jul 17, 2017 6:23 pm 
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That it is probably a power expander


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PostPosted: Sat Jul 29, 2017 11:15 am 
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Location: MONA TILES COMPOUND, NR. CHHANI CIRCLE, CHHANI ROAD, VADODARA - 390002. GUJARAT, INDIA.
you still have to make changes to the software because it's about power management instead of a thermistor, try it can always reset the settings to the old one, try it according to the instructions 3d printing in delhi ncr gurgaon india


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PostPosted: Tue Aug 08, 2017 3:23 pm 
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I am just wondering if it is intended behaviour that the heatbed output on the motherboard is always on...


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PostPosted: Tue Aug 08, 2017 3:48 pm 
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I just noticed that a little Zener diode with the number dZ6 is missing from the mainboard, I will probably try to replace this myself...


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PostPosted: Tue Aug 08, 2017 4:06 pm 
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I also noticed that the DZ4 AND the DZ5 Zener diodes are ALSO missing, is this intended to be like this, or did something go really wrong in the manufacturing process?

This is too much to be fixed by myself so I'm going to enter a ticket at the velleman support site, and try to get a new motherboard.....


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PostPosted: Tue Aug 08, 2017 4:49 pm 
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If you look at the schematics DZ4 goes to the thermistor of Extruder 1
DZ5 goes to the thermistor of Extruder 2
DZ6 goes to the thermistor of the bed.
I checked my board they are not there.

I don't think these are needed for proper operation of the board.


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