Specs for an MK2S Rambo system board replacement?  

RE: Specs for an MK2S Rambo system board replacement?

It is an Einsy Rambo 1.1b but a 1.2 will work.  I have 2 clones with one of each and they work fine.  

Posted by: @jpan

Hi, I've fried this board to a point that I need to replace it.  My question is... Will any Rambo board work, or do I need a specific version/configuration.  I'd like to get one from eBay if I could, but don't know what to look for exactly.  If there's a better place than eBay, let me know.  I just want to get something from the US because it should be faster.  Thanks!

RE: Specs for an MK2S Rambo system board replacement?

I'm pretty sure Mk2s firmware will not like an Einsy Rambo...   It is expecting to be used on a Mini Rambo.  

Mini Rambo is still around... You can get a USA-made one from Ultimaker complete with a Prusa-compatible bootloader or get a somewhat cheaper Chinese one which might not have a bootloader, which is a necessary pain to install.  

I have a USA-made Ultimaker one that worked great until I stopped using it.

RE: Specs for an MK2S Rambo system board replacement?

Good morning friend, all right, can you please help me, I bought rambo mini 1.3a from china because, at ultymachine it was not available and other stores, I need help with Bootloader Prusa, how to record, I will buy an ISP to record but no I'm getting it please if you have a step by step I will be grateful.

Posted by: @chicago-keri

I'm pretty sure Mk2s firmware will not like an Einsy Rambo...   It is expecting to be used on a Mini Rambo.  

Mini Rambo is still around... You can get a USA-made one from Ultimaker complete with a Prusa-compatible bootloader or get a somewhat cheaper Chinese one which might not have a bootloader, which is a necessary pain to install.  

I have a USA-made Ultimaker one that worked great until I stopped using it.

RE: Specs for an MK2S Rambo system board replacement?

Before going out and buying an ISP, just try the normal firmware flash... there's a good chance your board already has a boot loader, and if it doesn't have one there is no harm done.  

The MiniRambo does have to be powered up by the printer's power supply for a normal Firmware flash over USB... download  Mk2s firmware from here:   https://help.prusa3d.com/en/downloads/,  turn on the printer, start Prusa Slicer on your computer, connect the USB cable from the printer to the computer, select the device (USB) and try flashing the firmware.   

If the flash succeeds, you're done.  There was already a compatible boot loader on the board.

If the flash fails, then you need to get into the fine points of Arduino ISP flashing, figure out which ISP header to connect to, (probable one closest to the big chip) figure out the correct pinout, figure out the Arduino IDE program and find the source code.   This page seems to  get into the subject: https://forum.v1engineering.com/t/firmware-prusa-bootloader/29257

Good luck!