LASER always on CNC/LASER mode-couldn't turn off

T3P3Tony

@sarvan what about with the pin on Pin 8 disconnected?

sarvan

@t3p3tony pin 8 connected to duet laser pwm board

sarvan

@sarvan let me take some more clear pics and infos tomorrow

T3P3Tony

@sarvan yes, so what i wondered was if the laser is still firing with pin 8 not connected (but with all the other pins still connected.

sarvan

@t3p3tony here my connection to the duet from pwm board

When I switch to laser mode, the laser firing could not turn off by any code (M5). then again if go switch to CNC mode also laser is still firing and could not turn off.

if I unplugged the Pin-8. the laser is not firing.

T3P3Tony

@sarvan thanks, can you try the following. in your Laser mode config.g, I am not currently looking at the CNC config.g so lets put that aside for now until we have the laser working.:

M452 C"!exp.heater3" R255 F200

If that that does not make the laser work as expected then Instead of connecting to pin 8 on the expansion header, try connecting to pin 13 and change the laser config to use heater4.

M452 C"exp.heater4" R255 F200

Also can you confirm this turns on as soon as the printer boots, and not after (say) homing or some other action?

sarvan

@t3p3tony Thanks. let me try these step and check

sarvan

@t3p3tony No luck on either way. i have tried those steps you have mentioned.
I have checked connections continuity. everything is fine.
Bu, i have a doubt. once if i configure a heater pin say exp.heater3 and i checked the voltage it shows 0v. but, not configured exp. heater pins shows 3.some volts. it this normal?

I have only the laser config files in my duet. when I switch on the duet . the laser starts to firing.
When in CNC/LASER mode- not firing in CNC mode. if I switch to laser mode it starts to firing.(and if i switch back to CNC mode also still the laser is firing)

and I have checked the voltage coming through the pwm port from the duet pwm board it shows 7.2V.

so, I am going to buy a connecter type 74hct0-https://www.tandyonline.com/74hct02-quad-2-input-nor-gate.html to try out wiring manually.

sarvan

I have tried manual connections as well. it doesn't work. Any other suggestions @T3P3Tony ?

FelixH

did you ever figured that out? I am running on the same issue here, although when I unplug the pin on exp.heater3, the laser fires up anyway...

https://forum.duet3d.com/topic/26245/laser-cnc-macros-for-rrf3-on-workbee/4?_=1638642690083