Hi all, just a quick one.
I got a new K40 laser (new to me) that had a faulty PSU.
one of the caps had blow and they did not want to bother with it so took it off them.
I replaced the capacitor and fuse but it keeps blowing fused so shorting some where.
I am getting a new psu but slightly different (not here yet) .
Question is
on input it has
FG (ground ?)
L- (to laser via a large green thing)
AC
AC
question which AC is positive?
Also i get continuity between L- and FG, I checked the tracks on back and it goes to both so why the dedicated L- why not just to ground.
Thanks its doing my head in at the moment.
Typically it’s the transformer that goes on easy fix is just buy a new on off of eBay for 85 dollars
Check out the linked blog for information on LPS’s.
I do not recommend repairing these supplies as the cost of a new one does not eclipse the cost of parts, time and the danger you expose yourself to.
As @3D_Laser suggests buy a new one …
FG = frame ground = safety ground
-L is the laser cathodes ground. A separate connection insures that the laser ionizing current has an isolated path back to the LPS ground. This wire and connection is necessary.
Insure that -L is connected to the cathode and FG is connected to the machines frame and the safety ground pin on the plug.
I am not home so I do not know what AC connection is HOT but I do not think it really matters in this supply. I will check when I get home.
the AC is interchangeable, I have tried it both ways. And that large green thing is the load resistor, these are known for failing.