E1 Heater not working - check for board defect?
-
I checked the heater configuration on a duet 2 wifi and i can't get H2 to work there either. which makes a defective board less likely. Is there a jumper or something on the board I need to change?
-
please check the mosfet. see
https://forum.duet3d.com/topic/12237/duet-2-wifi-bed-no-longer-heating/25 -
I took a look at the mosfets, all 3 look identical and fine. Also checked the terminal connectors on the underside, no fault there.
I measured the two mosfets next to E1 and E2 from source to drain. has 24 V the other shows 0. So I guess the fault is somewhere further up the circuit. -
On the back of the board there are small soldered spots labeled TP6 to TP11, TP8 is not soldered, all others are. The Mosfet that is not working is labeled TR8. Could this be linked?
-
that has to be answered by @dc42
is it soldered on your duet wifi?
-
https://github.com/T3P3/Duet/raw/master/Duet2/Duet2v1.04/Duet2_1.04b_Schematic.pdf
TP8 is the test point for heater 2.
-
Should I still check on the Duet Wifi? I'd have to disassemble quite a bit of a printer to look at the underside so I'd rather not if this has already checked out as not related.
-
lets wait for what @dc42 has to say about the missing solder spot.
can you post a picture about the missing solder for him?
-
its on the bottom right of the picture
-
I might have found a work around. Since I have a expansion header there should be heaters 6 & 7 on there. I only need three so if H2 won't work I could switch to H6 instead, but I'm a little unsure if I got the wiring correct as there is a 5V pin in between. so based on this: https://duet3d.dozuki.com/Wiki/Duet_Expansion_Breakout_Board
I could connect my SSR to Heater 6 PWM and GND and just leave the 5V pin unused. Correct? -
So the system is running now. it would still be nice to know what causes the e1 heater not to work since I seem to have the same issue on both the duet 2 ethernet and duet 2 wifi I bought. it's either a huge coincidence or recurrent quality problem.
-
@PatrickC93 said in E1 Heater not working - check for board defect?:
its on the bottom right of the picture
The lesser amount of solder on TP8 is not significant. The tests run by our automated test equipment include the E1 heater output.
The only unusual thing I can see in your config.g file is that the heater name for the M305 P2 command includes an umlaut in the character string. That should be OK if you saved the file in UTF8 format, nevertheless I suggest you try it with the umlauted character removed or replaced.
-
Hi @dc42 ,
thank you for taking a look at it. I tried first without the Umlaut and it didn't work. I also switched around the name to heater H0 now, as that will be much more active than the "Einzugszone" which I'm controlling with H6 now.
I guess it may have been damaged during shipping or installation if you run testing on it but the packaging looked fine and with all the foam inside it's hard to imagine it beeing damaged during travel. During installation we were careful, but who knows, maybe not careful enough.
Anyway we have it running now and will start printing this week. -
@PatrickC93, I am happy to approve a warranty replacement for your Duet. It's possible that it has an intermittent fault that didn't show up during our testing.