I’ve check the low voltage side of things tomorrow. The visible damage I can see is to IC5, (maybe IC3 also), C24 and C23. see pic, after i’d cleaned them up a bit.
I’ll check in when i’ve had time to explore. Carefully!
@Calum_Stirling C23 and C24 are mis-labeled. They really are resistors. 1K-ohm. (You should confirm that the two associated diodes are acting like diodes as well.)
Thanks Nate, this is very helpful appreciating all your advice.
@Calum_Stirling yup definely the problem you got 220V on the L and 5V.
You might be better off to consider a new supply!
If the opti coupler blew then the rest of the psu should be okay. Try as suggested to replace the opti coupler and resistors.
Yeh planning on trying those things first. Thanks all!
@Paul_de_Groot if only the opto-coupler and resistor(s) is all that blew I would think that the on-board green led and fan will come on when power applied properly? If not there is a lot more wrong.
@donkjr Yes you’re right about that. The post was,very long so must have missed that part. The most likely scenario is indeed that someone swapped the connectors and blew the lowest voltage part. So probably most of the psu is toast. I’m like my father who repaired the washing machine 30 times. Sometimes you just have to replace it.
@Paul_de_Groot i find these are tough to repair because when something fails it usually takes a few parts with it. If you don’t find and replace all of them at once you just start lighting money on fire. You can get these supplies for <$70.
Well I am very pleased to report that after replacing two optocouplers and two resisters and reconnecting a blow circuit track the PSU was back in action. I connected it up and everything seems to work as it should. Tried a test engrave and that seemed ok too.
Feeling very lucky!!
@Calum_Stirling that confirms our hypothesis that the seller swapped the connectors😁
@Calum_Stirling nice another LPS victory under our belt, I have a LPS in my stack with a blown diode and never could logic why it blew, perhaps the user plugged the cables in incorrectly as well. Need to check out the opto-couplers probably.
@donkjr Thanks for your advice Don, was very pleasing to see it working.
It does seem however that a new problem has appeared today. See post
@Calum_Stirling what post?
@donkjr This one here, just 10mins ago. One giant leap forward and one back…
https://plus.google.com/106058704145699553667/posts/bjK9GE9WR5r
I responded to your other post.