I initially blew my right extruder with the brass brush. I lazily just switched to the left extruder from then on until one day when that one blew as well (for no obvious reason though, no brass brush involved). I went ahead and bridged R271 and added an inline fuse and that repaired the left extruder.

I had read somewhere that R272 was for the right extruder but that fuse actually tests fine so I don't want to try to solder that for no reason. It has continuity across it. Also, while I was testing for continuity, R271 seems to be connected to R272 anyway. Is that normal? Can anyone check theirs if it's not too much trouble?

Does anyone know what fuse number is really used for the right extruder? Is it actually R272?

All I know is I don't have 12v coming out of the right extruder's connection on the board when I have the extruder attempting to heat up. I measured right on the board. The wiring itself, connectors, thermistor, etc. all seem to be in working order otherwise. Just no power coming out of the board for that right extruder.

I added a pic of my board. You can see my burnt up repair on R271. It's not pretty but it did work.

So here is another question. I was looking at the component (see image) and R271, from what I can see is marked with a "T". In my looking to see what that means, from what I can find, it is a fuse, not a zero Ohm resistor.

All the other 0 Ohm resistors on the board are marked with 000.

Sorry for all the newb questions, want to make sure I get it fixed correctly

Hey.

You're correct in that those small components are in fact, surface mounted fuses.
The marking of "T"; and from what I gathered so far, means that they're 5A rated 0603-Sized SMD fuses.

Closest fuses that match these may most likely be from Littelfuse (438 Series)

They're likely littelfuse's based on the fact that the DaVinci's hotend heater is rated at 12V 40W (3.333A) and the size/marking/color scheme is the same.

If you ever intend on replacing them with other surface mount fuses, make sure you find similar specced fast blow SMD fuses.
Or just simply replace it with an inline fuse holder, etc.
Stay safe!

As a sidenote:
There's a few kooky revisions XYZ did to their daVinci motherboards. (besides the different features between the variants)
The AIO's have that array of 0 ohm resistors near the hotbed's connection, where as the 1.0, 1.0a's, and 2.0's don't. People have different fuse setups.

All the other 0 Ohm resistors on the board are marked with 000.

Sorry for all the newb questions, want to make sure I get it fixed correctly

The resistor is a zero ohm resistor. Just need to order one of that value and same physical size.

Thanks! I suppose I could use a "normal" sized  zero ohm (non-SM) and replace it with that as well, correct? Since it is essentially a jumper?

Hey Scubadog
I am having the same problem.  Soldered r271 and heating up like a SOB.  Kicks a 014 error. So i pull the plug.
Did you find a solution to your priblem?
Thanks
Dave

Your thermistor is probably bad or shorted as well. Worse case you shorted the 12 volts at the heater to the thermistor and blew your AD converter on your mainboard.

Questions:

1. Do I need to replace r271, and if so, what is the resistance value of it? I can solder just fine, but determining resistances of already installed components I have difficulty.

2. If I do not have to replace r271, will adding the inline fuse allow it to function as normal again?

3. I should switch to the Repetier firmware?

Thanks for any responses.