I found one of my machines had died and it had an Allied 250W PSU in it...another Deer it looks.
5VSB is dead. Figures.
Anyway as I was searching around for that DR-0183 switch controller chip (DR=Deer? Did they get their own chips?) I found someone had a 400W supply with the same chip. Well, that's not that surprising, TL494/KA7500's are used everywhere.
As I looked closer at the guy's pictures...his 400W PSU looked very uncanny...it was an exact copy of my 250W-rated supply! Same 470uFx2 input caps, placement is identical... Well, almost. Mine has input filters, his has a (possibly fake) PPFC choke. And then looking at it even closer, it seems his just has a bigger TO-247 diode packs instead of the TO-220's in mine.
And his was working apparently, but wanted to mod it for a higher output voltage. I suspect his PSU would probably soon end up like mine soon anyway... dead.
Alas most likely another worthless repair coming right up! Once I figure out why the 2-transistor oscillator is dead...
TBC...
5VSB is dead. Figures.
Anyway as I was searching around for that DR-0183 switch controller chip (DR=Deer? Did they get their own chips?) I found someone had a 400W supply with the same chip. Well, that's not that surprising, TL494/KA7500's are used everywhere.
As I looked closer at the guy's pictures...his 400W PSU looked very uncanny...it was an exact copy of my 250W-rated supply! Same 470uFx2 input caps, placement is identical... Well, almost. Mine has input filters, his has a (possibly fake) PPFC choke. And then looking at it even closer, it seems his just has a bigger TO-247 diode packs instead of the TO-220's in mine.
And his was working apparently, but wanted to mod it for a higher output voltage. I suspect his PSU would probably soon end up like mine soon anyway... dead.
Alas most likely another worthless repair coming right up! Once I figure out why the 2-transistor oscillator is dead...
TBC...
Comment