Rostock V2 thermistor fail

[cgbobio]

Looks like a board problem with Rambo, wonder if clearing the eeprom would help.

Thanks for the suggestion. I did clear the board and reloaded it again. Gave me the same results. Started taking the head apart... again and noticed one heating resistor lead was close to the head so I bent it back and retested... working again! I hope that was the problem.

My question now is, when using the screw-in thermistor from Ebay, do I set the (#define EXT0_TEMPSENSOR_TYPE) to 1 or to 97 in the configuration.h file?

[Eaglezsoar]

Installed the "new" threaded thermistor from Ebay, modified the configuration.h file and updated the firmware. Still having the same issue during the Autotune test...
This is a video of the LCD as the autotune test heats up the hot end... at around 140C everything goes crazy. Prior to this, I had a working printer with the stock thermistor that just started acting the same way... I thought I had it fixed...

http://youtu.be/cS0JoPdBcPg

You are using type one in the firmware thermistor tables?

[cgbobio]

Installed the "new" threaded thermistor from Ebay, modified the configuration.h file and updated the firmware. Still having the same issue during the Autotune test...
This is a video of the LCD as the autotune test heats up the hot end... at around 140C everything goes crazy. Prior to this, I had a working printer with the stock thermistor that just started acting the same way... I thought I had it fixed...

http://youtu.be/cS0JoPdBcPg

You are using type one in the firmware thermistor tables?

If you are referring to the configuration.h file, yes I set it to 1 but it did the same thing as the video above shows. Since I checked the head and bent one of the heating resistor leads away from the metal, it seems to be working again... Still having issues with heating the head up to 230C though... it gets close but if the bed is on, it never gets to 230 and the print won't start. I've started preheating it above 230 with the bed off so when it drops in temperature, at least the print will start.

[Eaglezsoar]

Installed the "new" threaded thermistor from Ebay, modified the configuration.h file and updated the firmware. Still having the same issue during the Autotune test...
This is a video of the LCD as the autotune test heats up the hot end... at around 140C everything goes crazy. Prior to this, I had a working printer with the stock thermistor that just started acting the same way... I thought I had it fixed...

http://youtu.be/cS0JoPdBcPg

You are using type one in the firmware thermistor tables?

If you are referring to the configuration.h file, yes I set it to 1 but it did the same thing as the video above shows. Since I checked the head and bent one of the heating resistor leads away from the metal, it seems to be working again... Still having issues with heating the head up to 230C though... it gets close but if the bed is on, it never gets to 230 and the print won't start. I've started preheating it above 230 with the bed off so when it drops in temperature, at least the print will start.

It sounds as though your power supply cannot supply sufficient current to handle both the bed and the hotend at the same time, but I think you already knew that.

[joecnc2006]

Installed the "new" threaded thermistor from Ebay, modified the configuration.h file and updated the firmware. Still having the same issue during the Autotune test...
This is a video of the LCD as the autotune test heats up the hot end... at around 140C everything goes crazy. Prior to this, I had a working printer with the stock thermistor that just started acting the same way... I thought I had it fixed...

http://youtu.be/cS0JoPdBcPg

You are using type one in the firmware thermistor tables?

If you are referring to the configuration.h file, yes I set it to 1 but it did the same thing as the video above shows. Since I checked the head and bent one of the heating resistor leads away from the metal, it seems to be working again... Still having issues with heating the head up to 230C though... it gets close but if the bed is on, it never gets to 230 and the print won't start. I've started preheating it above 230 with the bed off so when it drops in temperature, at least the print will start.

I had a small 80 mm (from old PSU) fan blowing on the Rambo Board and today when I got home I wanted to change it out as it was load to I took it out and put a 120mm fan in which was real quite, when I went to fire the printer up and get up to temperature I could not reach the 90c on the bed, when I remover the new fan the Bed temp shot up like it was suppose to so i guess the fan was pulling to many amps, strange but it was an older fan.

[Eaglezsoar]

Joe is there a hole under the Onyx where air from the fan could go thus cooling the Onyx? The V1 Max had such a hole and many users had to tape up the hole when they added a fan to blow on the Rambo.

[joecnc2006]

Joe is there a hole under the Onyx where air from the fan could go thus cooling the Onyx? The V1 Max had such a hole and many users had to tape up the hole when they added a fan to blow on the Rambo.

Thats a good Point, Yes there is I can add some tape there around the wires to block air flow.