Extruders (i3 pro c-dual) and heat bed do not heat up ...???

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joergS
Posts: 3
Joined: Fri Jan 13, 2017 9:17 pm

Extruders (i3 pro c-dual) and heat bed do not heat up ...???

Post by joergS »

Hello friends,

I just build my new i3 pro C (dual extruder) together with my 3 sons - a team project. :)
We had great fun and progress (worked through the little hick-ups and very much enjoyed the tips / tricks / info from all of you we found in the forum. THX.).
BUT now my gang of young engineers and i would like to see the machine work and print our first pieces to show the world ... - we are facing a (hopefully final) major issue - and need HELP.
I would greatly appreciate your support on the following:
Machine mechanics seems to be fine (all build and motors work - e.g. can control manually via repetier).
BUT temperature for the 2 extruder and the heat bed show 0 on the actual measurement while setting shows as adjusted. I.e we can set the temperature, but none of the heaters heat up. In fact the temp readings do not even show room temp. We e.g. see 0/65 or 0/215 all the time. I was expecting something like 20/65 before heating starts (i.e show the room temp as start) and then 65/65 in heated operation for the heat bed?!
Since all the temp readings are the same (0) and i would be surprised all sensors (thermistors) are defect same time - could there possibly be a setting issue in the firmware? (Any updated firmware?)
Did you have seen a similar problem before? We would very much appreciate any hint.
Thx
Greetings, Dad and 3 sons in need of your help
(Just to put our pressure to succeed in perspective: Mom is already nervous that we might spend too much time and will not ever get to print any of the great things we promised.)
bang
Posts: 402
Joined: Wed Dec 28, 2016 2:12 pm

Re: Extruders (i3 pro c-dual) and heat bed do not heat up ..

Post by bang »

Hi,you are right the display should be all "room temperature/0" when you switch on your printer.
And the heater will not work until the printer detects the right temperature of it.
You can refer to this to make some troubleshooting:
viewtopic.php?f=23&t=17030
joergS
Posts: 3
Joined: Fri Jan 13, 2017 9:17 pm

Re: Extruders (i3 pro c-dual) and heat bed do not heat up ..

Post by joergS »

I used the Multimeter to check all suggested voltages (12V) at Control board in, mosfets ... and ohm's of heat board .
Thermistors seem to function ...
Power (12V) is at mosfets - but for some reason there is no 12 V at connectors / terminals from control board to Extruders / heat board.

Is it possible that the Firmware in responds to Thermistor reading (wrong type set? in Marlin Firmware?!) might not trigger mosfets to open for heating? Firmware adjustment Issue?

Any hints - any experience with that?
Thank you very much.

Best, j
bang
Posts: 402
Joined: Wed Dec 28, 2016 2:12 pm

Re: Extruders (i3 pro c-dual) and heat bed do not heat up ..

Post by bang »

joergS wrote:I used the Multimeter to check all suggested voltages (12V) at Control board in, mosfets ... and ohm's of heat board .
Thermistors seem to function ...
Power (12V) is at mosfets - but for some reason there is no 12 V at connectors / terminals from control board to Extruders / heat board.

Is it possible that the Firmware in responds to Thermistor reading (wrong type set? in Marlin Firmware?!) might not trigger mosfets to open for heating? Firmware adjustment Issue?

Any hints - any experience with that?
Thank you very much.

Best, j
Maybe you can try reflashing the firmware for your printer(use Arduino 1.0.1):
viewtopic.php?f=20&t=17046
Then were all your tests on my attached post OK?Did the LCD show "358/0" when you plugged jumpers on those sockets?
And could you please attach some pictures about your tests?
joergS
Posts: 3
Joined: Fri Jan 13, 2017 9:17 pm

Re: Extruders (i3 pro c-dual) and heat bed do not heat up ..

Post by joergS »

Hallo Bang,
thank you very much for looking into the difficulties i posted.

I re-flashed the board already multiple times (works all the time now). I did do so to check if different thermistor settings would cause any difference to the always 0/0 temp show on LCD and in Repetier.
No change - i.e. certainly, if i choose a 10kohm, i will get a different initial set point (e.g. 300/0 or -29/0), but this is to be expected based on the underlaying calibration curve and the obvious non fit to the thermistor in use. Nevertheless, there is no temp change to the first temp value (0/0) when i e.g touch the thermistor and thereby increase the temp - stays at 0.
One change i had to do for firmware to load: I had to replace the 5 at the min temp check in the firmware against a 0 - otherwise the firmware does not load correct.

If i plug a jumper the value is 358/0.

My conclusion at this point is that the control board is defect and the temp reading is not taken correctly and then processed - i.e. the power set to extruder heater or heat bed (while misfit seem to be ok)?!

I am very appreciative to any advice.
At some point i will have to exchange the controls board (hope for replacement from GeeeTech - worse case have to buy a second one).
Thx.
Greetings,
Joerg
bang
Posts: 402
Joined: Wed Dec 28, 2016 2:12 pm

Re: Extruders (i3 pro c-dual) and heat bed do not heat up ..

Post by bang »

joergS wrote:Hallo Bang,
thank you very much for looking into the difficulties i posted.

I re-flashed the board already multiple times (works all the time now). I did do so to check if different thermistor settings would cause any difference to the always 0/0 temp show on LCD and in Repetier.
No change - i.e. certainly, if i choose a 10kohm, i will get a different initial set point (e.g. 300/0 or -29/0), but this is to be expected based on the underlaying calibration curve and the obvious non fit to the thermistor in use. Nevertheless, there is no temp change to the first temp value (0/0) when i e.g touch the thermistor and thereby increase the temp - stays at 0.
One change i had to do for firmware to load: I had to replace the 5 at the min temp check in the firmware against a 0 - otherwise the firmware does not load correct.

If i plug a jumper the value is 358/0.

My conclusion at this point is that the control board is defect and the temp reading is not taken correctly and then processed - i.e. the power set to extruder heater or heat bed (while misfit seem to be ok)?!

I am very appreciative to any advice.
At some point i will have to exchange the controls board (hope for replacement from GeeeTech - worse case have to buy a second one).
Thx.
Greetings,
Joerg
Hi,Joerg
1.Theoretically speaking,the socket/port on board is working properly if you get 358/0 with a jumper connected and get 0/0 with it disconnected.

2.I'm suspecting the thermistor circuit has an open source or the thermistor was broken(check it with a multimeter,100Kohm or so)?
And you can take out of the thermistor from the hotend to take a look,and check the pictures in this post:
viewtopic.php?f=19&t=18285&p=33459#p33459

3.In addition,i guess Geeetech will send the replacements if there is something wrong with these stuffs.Cause you got the printer just now.
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