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maureen
(@maureen)
Active Member
hot bed fail on self test

hi all, i'm struggling to find out why the heat bed only comes on for a few seconds the the red indicator light goes off and i get a fail. I haven't used a multi-meter much before this but i followed the steps in the help section and i got a reading of 3.9 on continuity and a very quick reading of 25 when the printer was turned on. I tried to get a reading from the cable with h on it but it didn't show anything at all. I'm hoping that all i need to do is replace this.

I forgot to mention this all started when i had to re-route some wires on the hot end which were stopping the y axis from travelling all the way along the axis. any help would be greatly appreciated.

 

 

Posted : 01/09/2019 11:04 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: hot bed fail on self test

check out continuity of the individual  heat bed wires between the heat bed terminals and the Einsy board...., then move the Y axis and check again... 

these wires sometimes break! internally due to flexing

 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 01/09/2019 5:01 pm
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(@)
Illustrious Member
RE: hot bed fail on self test

FYI: you can't measure continuity when power is on.  Terms you should do a little reading on are OHMS VOLTS and AMPS.  A very basic understanding of these terms will go a long way in trouble shooting problems like this.  Continuity is a vague term that can be interpreted too many ways: generally meaning "do these two things have some connectivity between them through which electricity can flow."  which by itself isn't really helpful to know.

Turn things off, disconnect the two bed wires at the Einsy end (leave the bed end connected) - measure the resistance between the two disconnected wires.  The bed and wires should measure about 4 ohms.

This post was modified 4 years ago by --
Posted : 01/09/2019 5:56 pm
maureen
(@maureen)
Active Member
Topic starter answered:
RE: hot bed fail on self test

thats how i did measure it i did one test when off and a voltage test when i turned it on

 

Posted : 02/09/2019 3:27 pm
maureen
(@maureen)
Active Member
Topic starter answered:
RE: hot bed fail on self test

i would joan but as i was running the configuration wizard i can't get off the main screen, i have flashed the board successfully but i can't get any further, prussa are sending me a replacement thermistor so i will have to see if that does the trick

Posted : 02/09/2019 3:32 pm
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