30-01-2017, 09:03 AM
Hi again Lew,
I took the front panel off yesterday. I had a play with the heat gun around the board and heating/cooling around components C17, VR2 and R17 caused the unit to alternate between overload and normal operation fairly consistently.
First I replaced C17 which had no effect. Next I replaced VR2 and tested. I was not able to get it to go into the overload state. I replaced R17 for good measure and put it all back together. VR2 is the current limit setting. I suspect the pot was dirty and going intermittent, perhaps causing the current overload protection to constantly trigger.
It's been running overnight and has been fine. I'm now contemplating adding a crowbar circuit and running the fan a different way as it's way too loud.
Hayden
I took the front panel off yesterday. I had a play with the heat gun around the board and heating/cooling around components C17, VR2 and R17 caused the unit to alternate between overload and normal operation fairly consistently.
First I replaced C17 which had no effect. Next I replaced VR2 and tested. I was not able to get it to go into the overload state. I replaced R17 for good measure and put it all back together. VR2 is the current limit setting. I suspect the pot was dirty and going intermittent, perhaps causing the current overload protection to constantly trigger.
It's been running overnight and has been fine. I'm now contemplating adding a crowbar circuit and running the fan a different way as it's way too loud.
Hayden