Trouble getting hotend working on Expansion Board 3HC

Ivan Miranda

Hi everyone! I just fried my Toolboard 1LC (all my fault) and was trying to use an expansion board 3HC as a temporary replacement while a new Toolboard that I just ordered arrived as I need to keep my big printer running.

I managed to get the can bus working and communicating, updated the firmware and bootloader on the 3HC and the MB6HC that is being used as the mainboard is up to date too, both firmware and DWC.
Tried to just modify the "config.g" to work with the new board but got to a point where I could not activate the hotend on the DWC. Clicking on it does nothing, changing temp does nothing.

I removed most of the stuff on the "config.g" trying to pinpoint the issue and got to this point:

This works:
M950 H5 C"out0" T5 Q500
DWC VIDEO

This doesn't work:
M950 H5 C"1.out0" T5 Q500
DWC VIDEO

Things I tried:

If the heater is configured on the MB it works even if the thermistor is configured on the EXP BOARD.

M98 "config.g" runs just fine with no errors.

CAN diagnostics gives no errors, no lost packets or delays.

CAN communication works and the exp board is on address 1. I tried other addresses.

Heater is on out0 even though that shouldn't matter much as the DWC doesn't even attempt to heat it as it doesn't activate.

I also tried to have the hotend as heater 1, no difference.

I've tried have the fans on the EXP BOARD, on the MB, one on each, no difference.

Any tips or advice, things to try, tests... are welcome as I don't know where to look anymore. At this point is more a personal pride matter than anything else as I'm sure I overlooked something really simple and obvious but I cannot find it.

deckingman

@Ivan-Miranda You haven't said where the temperature sensor is located, but if that's on the main board or any board other than the one with the heater, then you'll have fallen foul of a (permanent) firmware limitation https://docs.duet3d.com/en/User_manual/RepRapFirmware/CAN_limitations

dc42

@Ivan-Miranda please post your complete config.g file, also config-override.g if you have one. Also please check and confirm the firmware versions on both boards using M115 and M115 B1. Latest MB6HC firmware is 3.4.5; latest 3HC firmware is 3.4.4.

Ivan Miranda

@deckingman I tried both, on the expansion board and on the mainboard, no difference. I've read the firmware limitstions and I'm not stepping on any of them that I know of.

Ivan Miranda

@dc42 Oh my! I had pasted the config.g file and checked that there was no config-override.g and was so smugly going to post that I had already checked firmware versions and M115 returned that the Mainboard was not on 3.4.5!! Updated it and it just works!! I had spent many hours trying to troubleshoot it and had read every single post on this forum but somehow I updated the firmware of my other big printer instead of this one and wrongly thought it was up to date.
I promise I will come here first next time. Thanks a lot Tony!!

T3P3Tony

@Ivan-Miranda glad it's sorted!