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how to troubleshoot when Sanguinololu not heating

Posted: Fri Oct 30, 2015 11:01 am
by Sherry
1.Extruder/Hotbed is not heating
This is the SCH of extruder & hot bed heater
sch.png
sch.png (17.89 KiB) Viewed 18253 times
QQ图片20151030102607.png
QQ图片20151030102607.png (419.53 KiB) Viewed 18253 times
Q1 is hot end mosfet,Q2 is hot bed mosfet.
QQ图片20151030102950.png
QQ图片20151030102950.png (2.74 KiB) Viewed 18253 times
1. Firstly, let us check power supply outputs. Some people use host power supply whose one of output is 5V which can’t support hotend/hotbed to heat obviously.
QQ图片20151030103013.png
QQ图片20151030103013.png (2.2 KiB) Viewed 18253 times
Then checking whether the 12V DC could power up the mainboard or not.
①Only plug USB without 12V DC, the power LED is lighted.
②Only turn on 12V DC without USB. The LED is lighted as well.
If not,The 12V DC is not turn on or broken;
Or L7805 is broken.
power.jpg
power.jpg (30.42 KiB) Viewed 18253 times
power led.jpg
power led.jpg (26.05 KiB) Viewed 18253 times
2. Secondly, checking if the mainboard temp reading and thermistors are good. Sometimes the LCD is not sensitive, please reset the LCD panel before reading LCD every time.
1) Make the both thermistor slots open circuit. The LCD will display 0/0, 0/0, MIN TEMP.
open circuit.png
open circuit.png (677.32 KiB) Viewed 18253 times
2) Make the both thermistor slots short circuit by plugging jumper caps. The LCD will display 358/0,358/0 , MAXTEMP.
short circuit.png
short circuit.png (389.74 KiB) Viewed 18253 times
3) Plug thermistors.it will display room temperature/0, room temperature/0.
thermistor.png
thermistor.png (579.52 KiB) Viewed 18253 times
3. Thirdly, let us check whether the resistance of hot bed and hot end are normal.
Tip:Please short out the red and black probe at first, you can read a internal resistance. To get a more accurate resistance. The internal resistance should be subtracted from the resistance you measure next.
internal resistance.png
internal resistance.png (435.02 KiB) Viewed 18253 times
Hot end: it’s resistance is 3.8ohms. 3.8 minus 0.3 is 3.5ohms.
Tip: please let probe tips touch metal carbonyl conducting layer inside insulation material.
hot end resistance.jpg
hot end resistance.jpg (77.35 KiB) Viewed 18252 times
Hot bed: it’s resistance is 1-2ohms.
Here is two type of hot bed: MK2A&MK2B
hot bed(MK2A).png
hot bed(MK2A).png (610.39 KiB) Viewed 18252 times
hot bed(MK2B).png
hot bed(MK2B).png (830.33 KiB) Viewed 18252 times
4. Finally, let us check their MOSFETS.
Please plug both hot end heating wire and hot bed’s.
Tip: Make the metal carbonyl conducting layer of heat cables be in good contact with slots. Otherwise the following test will be fail.
MOSFETS.png
MOSFETS.png (290.05 KiB) Viewed 18252 times
When not heating
VH_END=0V.
VH_BED=0V.
hot bed mosfet(no heating).jpg
hot bed mosfet(no heating).jpg (130.27 KiB) Viewed 18252 times
When heating, MOSFET are breakover.
VH_END=10.88V.
VH_BED=10.61V.
hot end mosfet.jpg
hot end mosfet.jpg (128.23 KiB) Viewed 18246 times
hot bed mosfet.png
hot bed mosfet.png (924.64 KiB) Viewed 16438 times
Extruder is overheat
1. Checking if the outputs of power supply are over 12V.
2. Checking if mainboard can read correct temperature and the both thermistor are good.
3. Maybe MOSFET is out of control. In other words, the MOSFET is always on even if it reach the temperature you have set.
In this case, please check if there is short circuit in mainboard.
over heat.jpg
over heat.jpg (168.02 KiB) Viewed 16438 times

Re: how to troubleshoot when Sanguinololu not heating

Posted: Wed Jan 16, 2019 8:08 pm
by soniyasheelu7738
That's a definitely bad, as this will short the output from the transistors, it shouldn't damage them though.

It is possible to get insulation washers, to put between the transistors and the hotend, but the easy solution is to just detach the hotend transistor from the heatsink (it shouldnt really get hot), and make sure it doesn't touch the heatsink. Use some tape, to isolate it.

But you really should isolate the transistor from the heatsink, to minimize the risk for shorting the output.

Re: how to troubleshoot when Sanguinololu not heating

Posted: Wed Jan 16, 2019 11:42 pm
by William
Your point is correct and clear!

Re: how to troubleshoot when Sanguinololu not heating

Posted: Tue Jan 29, 2019 5:34 am
by hakkubaba
I am an electrical engineer and thats a complicated problem that you have it is looking worst from my point of view for your system. Make the help of epople who you thing a trend expert in the meidum to undo some things that will make it ease for the people who are going to face it.

Re: how to troubleshoot when Sanguinololu not heating

Posted: Mon Mar 23, 2020 2:15 am
by farhkh
it happened with me too, but now working fine.
Farhantech

Re: how to troubleshoot when Sanguinololu not heating

Posted: Mon Mar 30, 2020 9:17 pm
by Stevesmith
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Re: how to troubleshoot when Sanguinololu not heating

Posted: Mon Mar 30, 2020 9:19 pm
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Re: how to troubleshoot when Sanguinololu not heating

Posted: Mon Mar 30, 2020 9:21 pm
by Stevesmith

Re: how to troubleshoot when Sanguinololu not heating

Posted: Wed Jul 15, 2020 2:06 pm
by inigowilson