Duet 3 EB 3HC intermittent CAN/boot? failure

dc42

@max-0, thanks. We will replace your board under warranty. Please complete the reselleller warranty form at https://docs.google.com/forms/d/e/1FAIpQLSdXpbRCNxUc2j_OePtuWdwyKPJ9VEg2Ohq_80f-VCZ4SCJJ9w/viewform.

We would like you to send that board direct to me, at our cost. We will be in touch with you by email to arrange that.

Max 0

@dc42 thank you for your quick response on this. I have just filled out the warranty form.

Max 0

@dc42 my new board has arrived now, so I thought I would give you a quick update on this. I have tested power cycling the machine multiple times and so far the expansion board has worked flawlessly, establishing a connection every time. What I found quite interesting is that the serial number on the new board I received is only two lower than that on the old board and the crystal appears to be the same aswell.

According to the DHL tracking number my old board has left the import sorting facility in the U.K. already, so it should hopefully be with you some time at the beginning of next week.

Thank you once again for your help with solving this and if you need any more information about this please don´t hesitate to contact me.

Max

JuJuDelta

Hi Dave & Max,

I have 4 off 3HC boards and one of them has been a bit of a CAN bus nuisance since day 1, but I have persevered.

The board in question has the same crystal markings as the photo above "120 020a"

Since a recent update (3.3.2 and various 3.3 betas) there is no longer any CAN bus activity RED led flashing, it is off all the time.
Now there is a small chance that I may have inadvertently messed up by trying to load the boot loader and consequently there is no LED activity.

so, I have ordered a ST-Link V2 and JST 1.5mm harness so will try to re-install the boot loader at the correct location.

I will report back later during the week.

@dc42:
Dave, if I am unsuccessful, may I return the board back to you for a quick check, happy to paypal you return postage ? Based in Coventry, not a million miles from you.
Or I am happy to re-solder a different batch# XTAL if you can advise or signpost me to Farnell RS etc.

Board was originally purchased by my client from Oozenest.

PCB is v1.0 with a central hole near the processor, orange sticker dot and label "DUET3 EB1 WD01117"

T
Thanks & Regards,

Julian.

dc42

Sure, send it to me. I will investigate the problem and fit a new crystal if it needs one.

JuJuDelta

@dc42 said in Duet 3 EB 3HC intermittent CAN/boot? failure:

Sure, send it to me. I will investigate the problem and fit a new crystal if it needs one.

Hi Dave,

Thanks for the offer.
Can you PM your postal address please ?

skunkwerkzlabATgmailDOTcom

Regards,

Julian

dc42

@jujudelta I have sent you a PM.

ballanux

Hi all!

I'm new to the Duet platform so let me know if I'm missing something but I'm quite sure I have this same issue. I was experiencing very low torque on my 3 Z axis steppers, but good torque on the XY ones. The Z steppers are connected to the 3HC board ant the XY ones to the mainboard....

I didn't look into the forum until my "replacement" and more powerful steppers showed up and didn't perform any better

After finding this and other similar post, I tested sending manually the M906 command I got a CAN bus error:

CAN error

I really would had appreciated if this were also reported during normal boot of the mainboard... It would have reduced the time to find the issue...

Anyway, if this is related to a bad batch of crystals, here is mine:

alt text

I bought my board through FilaFarm, please let me know if I'm really affected by this, or how can I confirm it and If I have to manage a replacement either with Filafarm or directly here.

Thanks

dc42

@ballanux the key test is: when you power up the 3HC board, does the red LED between the CAN connectors start blinking almost immediately (within half a second)? If it doesn't always start blinking immediately, then it's a startup issue. If that's the case, please send M122 B1 when the board is responding, so that we can check whether you are running the correct firmware version.

If the red LED does always start blinking immediately after power up, then it's probably configuration issue, or perhaps you have incompatible firmware versions on the main board and the expansion board. So please share your config.g file and the results of running M115 and M122 B1.

ballanux

@dc42 Thanks for your quick reply and pointing me in the right direction

I had different firmware in the 3HC and the mainboard, I'm quite sure I uploaded both .bin files from the same release, but maybe the 3HC didn't update... anyway, I have now both of them on 3.2.2 version and the M906 command is being received and the stepper has the proper torque.