Hello, I decided to get into powder coating as a hobby and as a way to make some extra revenue, so I bought an expensive used Nordson Surecoat powder coater which I was assured worked however when I plugged it in I saw a very quick flicker of the backlit screen then nothing. I took it apart and found the power supply board (LPT46) was not outputting the correct voltages (+5v +12v +24v) so I ordered a new LPT46 power supply board hoping that would fix the problem. When I received the new one I plugged it in and tried turning it on only to find it still was not operational. I then replaced the AC line filter as it was the only other component between the wall and the LPT46 40w power supply board (other than a mechanical switch which is working and tests 120v coming out of it) with no change.
When I try to bench test the LPT46 40w power supply board I hear a tiny *click* sound (almost like a tiny relay tripping/resetting) with a tiny spike of voltage at the output pins (about 0.5v for the duration of the click) then nothing until it clicks again (about every 3-4 seconds)
Here is a link to the LPT46 data sheet:
https://www.mouser.com/ds/2/633/lpt40series_ds_1184686732_ds-708059.pdf
Am I right to assume that both power supply boards are non-operational?
I found one wire from the output (SK2- pin 5) had come loose and was pushed back into an unused spot on the connector that goes to an unused pin on the control board (pretty sure this caused the replacement LPT46 board to fail)
Is there any special procedure for testing this LPT46 power supply board beyond hooking it up to power and checking its output pins with a multimeter? I don't have much of a background in electronics other than a lot of DIY repairs mainly involving observational testing.. I have always wanted to get into electronics as a hobby but as of yet I have only tinkered with fixing stuff when it breaks..
As far as I can tell I don't believe either LPT46 is functioning properly, I just don't want to buy ANOTHER one to try only to find out one (or both) of these LPT46's I have are operational and not be able to return any of them..
Any help you can provide is GREATLY appreciated!