Posts made by visnu777

@t3p3tony
The replacement of the expansion board did the trick, thanks

@t3p3tony
For the mainboard or the expansion? After all this troubleshooting I'm somewhat sure that its the HC6s CAN fault but I have no spare to test if the HC3 works...

@t3p3tony
no, it was never light up so far.

@dc42 said in Duet 6HC and 3HC Expansion board CAN connection not working:

Regarding continuity, with power off, CAN cable connected and the termination jumpers removed from the 3HC, you should get 120 ohms between the two outer termination pins. With the jumpers fitted you should get 60 ohms between the two jumpers.

The 3hc has the right resistance

Hi dc42

@dc42 said in Duet 6HC and 3HC Expansion board CAN connection not working:

Is the green 3.3V LED on the 3HC board lit?

All LEDs are lit.

@dc42 said in Duet 6HC and 3HC Expansion board CAN connection not working:

Is anything connected to the 3HC apart from power and CAN, e.g. endstop switches? If so, please disconnect them and try again.

no, nothing connected but CAN and power
Regarding continuity, with power off, CAN cable connected and the termination jumpers removed from the 3HC, you should get 120 ohms between the two outer termination pins. With the jumpers fitted you should get 60 ohms between the two jumpers.

@dc42 said in Duet 6HC and 3HC Expansion board CAN connection not working:

Does the red LED between the CAN connectors on the 3HC light up at all?

No. Never did according to the builders

@dc42 said in Duet 6HC and 3HC Expansion board CAN connection not working:

Regarding continuity, with power off, CAN cable connected and the termination Regarding continuity, with power off, CAN cable connected and the termination jumpers removed from the 3HC, you should get 120 ohms between the two outer termination pins. With the jumpers fitted you should get 60 ohms between the two jumpers.jumpers removed from the 3HC, you should get 120 ohms between the two outer termination pins. With the jumpers fitted you should get 60 ohms between the two jumpers.

I'll check next week, its at university/work Thanks for your advice

@rjenkinsgb
I think I found another clue and it looks like it has nothing to do with the EXP HC3:

Without CAN connection a continuity test between the two CAN pins on the Mainboard beeps when the board is powered otherwise not. So something on board switches the two together when we have power. Is it possible to do that via firmware?
I told the students building the printer to do a check with an empty config to rule that out...

edit: I also checked the connectors, the one on the HC6 lokks ok connectorwise but is not well soldered at all, didnt notice before

edit: New clue: Empty Config makes it go away (with hard reset) but CAN indicator led still does nothing,
old firmware makes the weird thing come back.

@phaedrux
I just checked the cable for continuity again (works) and additionally I checked it on the exposed pins of the rj11 conenctor on the board (see picture)

Strange thing (or not, might be normal): When I check it like on the picture (left CAN pin), both CAN pins in the middle give me a beep on Mainboard side, is that normal? When the right pin on the EXP is tested only the right pin beeps

Pressing reset (with FW file in the right folder and all DIP off) does nothing, setting dip adress on 1 also.

Any clues? It never worked, never had connected anything else but the CAN cables and power supply and the diagnostic LED never showed any falshing or steady red light. Is the board DOA?

@phaedrux Its a custom RJ11 6pin cable with successful continuity check.
edit: We already tried another one, check made with the cable plugged in on the exposed pins on board.

@deckingman Thanks, will try that tomorrow but the LED should do something regardless of the address? I already tried the manual firmware flash by gcode from the DWC. We also tried the 1000 first but the CAN led between the two RJ11 ports never showed any sign of life yet

@deckingman Thanks for your reply It should be terminated correctly, as I understood it both jumpers should be closed on the last device on the bus (see the picture I posted)
The DIp switch was originally in 1000 position but it was the same result., no blinking status led. According to the documentation it should work with all off too

Hi there,

we're currently in the process of building a big printer with a pulsar pellet extruder.

The main board is a Duet3 6HC which is working great so far but now we need the 3HC Expansion to drive the Pulsar. We connected both via RJ11 but there is no reaction from the red Status LED everyone is talking about, no matter if the DIP switches are all off or not

Michael

Hello everyone
I/we recently purchased two Panel Due 7i, one for future use with a Duet3HC and one for our Duet2Wifi. After I connected it to the Duet2 to test it for defects it initially worked but on the next day the screen only went white (Backlight?). I successfully reflashed it with the current firmware but the screen stayed white, regardless if I connect it to USB power supply, USB port or the two connector options for the Duet.
The second display is working great so it seems to me its a hardware defect. Does anyone have an idea if I overlooked something that might be solveable?

Michael