Bad Einsy Board  

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jim.h9
(@jim-h9)
Eminent Member

I am now getting the following errors on my Mk3 using firmware 3.4.1:
"thermal runaway"
"preheat error"
"bed preheat error"

Things that I just tried:
Voltages out from power supply are 24.0v, 24.0v, and 24.0v
voltages into einsy rambo board are: pwr in 24.0v, bed input 24.0v. 

When I try to preheat the bed or extruder the bed output 0.0v and heater output 0.0v.

Used a hair dryer on the bed and the temp started to rise on the info screen.
Used a hair dryer on the hotend and the temp started to rise on the info screen.
Thus telling me that both thermisters are good.

What my findings are telling me is that the einsy board is bad.

 

Jim
       

This topic was modified 1 year ago by jim.h9
Posted : 27/04/2019 3:45 pm
toaf
 toaf
(@toaf)
Noble Member

did you check the fuses?

I have a Prusa,therefore I research....
Posted : 27/04/2019 3:49 pm
jim.h9
(@jim-h9)
Eminent Member

Yes. They are fine.

Posted : 27/04/2019 3:53 pm
Tim
(@tim-m30)
Illustrious Member

Fuses can look good and be bad, but unlikely two show up with this at once, though the same logic follows for the two separate heater drivers failing at the same time.  

What does a self test tell you?

Have you probed the test points on the Einsy? 

It is always wise to get more than one opinion......
Posted : 27/04/2019 6:26 pm
jim.h9
(@jim-h9)
Eminent Member
Posted by: tim.m30

Fuses can look good and be bad, but unlikely two show up with this at once, though the same logic follows for the two separate heater drivers failing at the same time.  

What does a self test tell you?

Have you probed the test points on the Einsy? 

All 4 fuses have continuity.

"Selftest error! Please check: Heater/Thermister Not connected"

I am unfamiliar with probing the test points. Any link or how to.

Posted : 27/04/2019 6:38 pm
toaf
 toaf
(@toaf)
Noble Member

do you have a pi connected to the board?

I have a Prusa,therefore I research....
Posted : 27/04/2019 7:05 pm
jim.h9
(@jim-h9)
Eminent Member

I just printed 6 prints just before I received these errors. Just out of curiosity I disconnected the power panic connector from the einsy board and ran a self test. It tested fine. I am now printing an object.

Why would disconnecting the power panic connector from the einsy board make everything OK now??? Puzzled.

 

Jim

Posted : 27/04/2019 7:18 pm
jim.h9
(@jim-h9)
Eminent Member

Is there any difference between the Prusa einsy Rambo board and any other einsy Rambo board from ebay, amazon, etc? What version is Prusa board?

Jim

 

Posted : 27/04/2019 7:28 pm
toaf
 toaf
(@toaf)
Noble Member
Posted by: jim.h9

I just printed 6 prints just before I received these errors. Just out of curiosity I disconnected the power panic connector from the einsy board and ran a self test. It tested fine. I am now printing an object.

Why would disconnecting the power panic connector from the einsy board make everything OK now??? Puzzled.

 

Jim

maybe the switch is going bad.  an idea anyway glad you got it going

I have a Prusa,therefore I research....
Posted : 27/04/2019 7:56 pm
Tim
(@tim-m30)
Illustrious Member
Posted by: jim.h9

I just printed 6 prints just before I received these errors. Just out of curiosity I disconnected the power panic connector from the einsy board and ran a self test. It tested fine. I am now printing an object.

Why would disconnecting the power panic connector from the einsy board make everything OK now??? Puzzled.

 

Jim

Short answer - it didn't; longer answer, you bumped one of the cables that is going intermittent.  The failure is likely to come back.  Self test failing is a big clue. Continuity to the heater or thermistor was missing - and since you saw temp readings, the failing part is the heater itself.  Could be a bad wire - broken between extruder and einsy case - bad connector - etc.  Removing the panic wires you bumped something else.

It is always wise to get more than one opinion......
Posted : 27/04/2019 9:38 pm
jim.h9
(@jim-h9)
Eminent Member
Posted by: tim.m30
Posted by: jim.h9

I just printed 6 prints just before I received these errors. Just out of curiosity I disconnected the power panic connector from the einsy board and ran a self test. It tested fine. I am now printing an object.

Why would disconnecting the power panic connector from the einsy board make everything OK now??? Puzzled.

 

Jim

Short answer - it didn't; longer answer, you bumped one of the cables that is going intermittent.  The failure is likely to come back.  Self test failing is a big clue. Continuity to the heater or thermistor was missing - and since you saw temp readings, the failing part is the heater itself.  Could be a bad wire - broken between extruder and einsy case - bad connector - etc.  Removing the panic wires you bumped something else.

Logically you are correct. Why would the panic card have anything to do with the problem BUT I was very careful and replaced the cable into the Rambo. The problem came back again. Removed it and it was gone. Replaced it and it reappeared. Removed it and it was gone. Did this about 5 times and the same thing. This is telling me there is something wrong with the board. 

Posted : 29/04/2019 3:30 pm
Vojtěch
(@vojtech-p6)
Honorable Member

Are you sure you're plugging the power panic plug into the right connector on the Einsy? This looks like when plugged in, it's messing up the ADC in the ATMega.

Posted : 29/04/2019 3:44 pm
Tim
(@tim-m30)
Illustrious Member

I haven't confirmed it - but I suspect the front reset button connects to the EINSY reset function via the LCD panel via Header 14.  All it does is reset the EINSY, and has no connection to heaters that would affect them. There is an AC fault that connects in the same header, and if asserted could turn off bed and nozzle heat, but probably has other effects.  Then again, if you are only removing the PP wire - the one that is right next to the power strip - not much can go wrong there except flexing the exact wires that power the heaters.

Contact Prusa, and discuss the issue with them. After all, that is what a warranty is for.

This post was modified 1 year ago by Tim
It is always wise to get more than one opinion......
Posted : 29/04/2019 6:18 pm
Tim
(@tim-m30)
Illustrious Member

A photo showing the wire removed would be helpful.

It is always wise to get more than one opinion......
Posted : 29/04/2019 6:24 pm
jim.h9
(@jim-h9)
Eminent Member

This was from Prusa support.

"Hello,

When do you get those error messages? When you start the print?
Can you run the self-test and let me know the results?
 
I think to try would be to disconnect the Power-Panic cable from the Einsy board and see if it resolves the issue. It's black and white cable -  https://d17kynu4zpq5hy.cloudfront.net/igi/prusa3d/4YobwHH2WD64Aler.huge
 
Best regards,

Marek Míček

Customer Support"
 
They even asked me to remove the power-panic cable. 
This post was modified 1 year ago by jim.h9
Posted : 30/04/2019 8:17 pm
Tim
(@tim-m30)
Illustrious Member

The button might be shorted, but I would think there would be other side effects beyond simple no heat.  The circuit does affect the heaters, but also causes (or should cause) a CPU interrupt to turn off all print activity.  But, maybe the firmware is broken and doesn't check the switch state at power up ... probably good to know; I'll go check Github to see if there's a bug report.   In any case, ohm the PP connector - if shorted ask Prusa for a new switch with cable.

It is always wise to get more than one opinion......
Posted : 30/04/2019 9:06 pm
Tim
(@tim-m30)
Illustrious Member

I didn't see any related bug report so posted one; I placed it in MK3 - hopefully if there is an issue whoever looks will tag it for all affected printers.

It is always wise to get more than one opinion......
Posted : 30/04/2019 9:19 pm
nikolai.r
(@nikolai-r)
Noble Member

I would suggest to contact Prusa Live Support. It's nearly impossible to clarify such an issue through email.

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Posted : 30/04/2019 10:01 pm
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