@Jason_Farrell sorry to repeat stuff but we have to be clear on the symptoms so I don’t take us down a rat hole 
1.0 The laser, the current meter and the “Test” function all now works?
2.0 The gantry won’t reset.
2.1 What do you mean by reset, not homing?
2.2 Can you post video?
3.0 On the controller card the voltages read:
3.1 5v
3.2 24V
3.3 LO 4.96 (that should be correct when not printing)
4.0 I dont understand the ground symptoms.
4.1 if you connect the mains ground to the chassis the laser won’t fire? Is the mains ground not connected?
4.2 on a separate issue the current does not go higher than 12ma?
Sorry Don,
#1 yes they do.
#2 /2.1 does move/doesn’t reset.
#3/3.1/3.2 all correct.
#4/4.1 I am only using ground taken from mains, nothing to chassis.
When connected to chassis laser won’t fire.
#4.2 Correct. Does not go higher than 12ma
@Jason_Farrell
It does seem like there is a ground problem.
1.0 with machine off measure OHMS from LPS gnd to chassis.
Sorry don , only getting a chance between work. I don’t know if I did it properly but took readings.
200- bat
2000- 983
20k- 0.99
200k- 01.0
2000k-001
I attach photos, I took readings between fg on power supply to chassis.
Don you are not going to believe this ! Its sorted, I am a total dumbass. I read your diagram wrong !
I reversed the wiring on the m2 nano. Completely stupid !
Thank you so so so so much for your help and your massive patience in listening to me !
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Seems to be don , test fires ok and can be adjusted ok, goes up to 30ma now also. Going to focus it today and get back to using it hopefully !
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