EEVblog Electronics Community Forum

Electronics => Beginners => Topic started by: paul_allsopp on March 03, 2017, 09:44:14 pm

Title: What is this part?
Post by: paul_allsopp on March 03, 2017, 09:44:14 pm

Can someone tell me what this SMD component is (R56)? I assume it is a fuse, but not sure.
https://drive.google.com/file/d/0B1uriJhzSGi-bzRqQ284SFQ4ajlPS3NoNi04NS1mbnhiWVdR/view?usp=sharing (https://drive.google.com/file/d/0B1uriJhzSGi-bzRqQ284SFQ4ajlPS3NoNi04NS1mbnhiWVdR/view?usp=sharing)

It's part of this circuit I am trying to figure out (part is bottom left):
https://drive.google.com/file/d/0B1uriJhzSGi-WUF2MXNoMXhFOE9Zb05EZ0QwaWsxUHdGQ0dr/view?usp=sharing (https://drive.google.com/file/d/0B1uriJhzSGi-WUF2MXNoMXhFOE9Zb05EZ0QwaWsxUHdGQ0dr/view?usp=sharing)

This is the board:
https://drive.google.com/file/d/0B1uriJhzSGi-Yk9jQnNzZWk5WEk/view?usp=sharing (https://drive.google.com/file/d/0B1uriJhzSGi-Yk9jQnNzZWk5WEk/view?usp=sharing)

I have a 3D printer (DaVinci 2 Duo) and suddenly both extruders stopped heating. I remove them, put them on my bench PSU at 12v and 2.4A and they both heat up just fine. So I put a meter on the thermistor to make sure that was not faulty, but they both work. So I started looking at the board, and noticed that if I put a meter from ground on the PSU for the printer and the power pin on one of the extruder sockets, one socket reads zero. So I shorted one of those components to bypass it and the extruder is getting the required 12v@2.4A. This leads me to believe this component is a fuse that has blown.

Replacing it is just the tip of the iceberg though, as with the bypass in place, turning on the printer, the extruder starts to heat without any instruction to. Then the other extruder also has an issue whereby the component is not compromised, but I still get no power to the extruder...this could be a bad heating element in the extruder though, so I will replace that and test it again.

I'm loath to just replace the board because they cost $200USD, and I may be able to fix it for a few bucks.

ANY help at all is very appreciated. Talking to the DaVinci community, it seems that just about everyone is having similar issues, with some members on their 5th board within the 1-year warranty. Unfortunately I am outside my warranty.

Thanks all.
Paul

Title: Re: What is this part?
Post by: Benta on March 03, 2017, 10:03:35 pm

Your "Google Drive" links don't work.

Title: Re: What is this part?
Post by: bktemp on March 03, 2017, 10:04:00 pm

Looks like a fuse.
According to this it could be 5A, but is hard to guess without knowing the manufacturer and its marking code system.
http://www.farnell.com/datasheets/1716418.pdf (http://www.farnell.com/datasheets/1716418.pdf)

Title: Re: What is this part?
Post by: sleemanj on March 03, 2017, 10:06:55 pm

I expect you have already read these, but just in case...

https://www.3dprintingforum.org/forum/hardware/manufacturers/xyzprinting/3384-extruders-not-heating-on-da-vinci-2-0-duo (https://www.3dprintingforum.org/forum/hardware/manufacturers/xyzprinting/3384-extruders-not-heating-on-da-vinci-2-0-duo)
https://forum.voltivo.com/showthread.php?tid=8517 (https://forum.voltivo.com/showthread.php?tid=8517)

Title: Re: What is this part?
Post by: coyote20000 on March 05, 2017, 06:26:17 pm

Designation is 'R'.  Most likely a resistor.  Odd that it has no numbers.  Could be a 0 ohm.
bktemp might have it right, but why would the label be R?
Take it off and measure it..  :D