Re: Spectroniq PLTV-3250 wont start
Mine had Q1 and Q2 shorted (and the fuse out), and it also looked like ZD3 was shorted. When I took ZD3 out I still measured low resistance, but not entirely 0 ohm (and more than my meter's leads). Apparently this is how the circuit should be.
I also took the time to verify if ZD3 was still allright after I baked it off the PCB (it was glued as well, so it got a bit hotter than I wanted). ZD3 was still okay, but it turns out to be a 15V zener, not 16V as someone suggested (I guess people keep copying what they find on the internet). It has marking code '15B' on it, which could very well be Vishay's TLZ15B. Page 3 of the datasheet shows this marking code:
On my PCB, Q1 and Q2 were 2SK3667 FETs, but this can vary by revision I suppose. I guess I'll replace them with an STP11NK50ZFP from ST. Only Pd is somewhat inferior, but I think the insulated TO-220FP will be the bottleneck in terms of dissipation anyways.
Mine had Q1 and Q2 shorted (and the fuse out), and it also looked like ZD3 was shorted. When I took ZD3 out I still measured low resistance, but not entirely 0 ohm (and more than my meter's leads). Apparently this is how the circuit should be.
I also took the time to verify if ZD3 was still allright after I baked it off the PCB (it was glued as well, so it got a bit hotter than I wanted). ZD3 was still okay, but it turns out to be a 15V zener, not 16V as someone suggested (I guess people keep copying what they find on the internet). It has marking code '15B' on it, which could very well be Vishay's TLZ15B. Page 3 of the datasheet shows this marking code:
On my PCB, Q1 and Q2 were 2SK3667 FETs, but this can vary by revision I suppose. I guess I'll replace them with an STP11NK50ZFP from ST. Only Pd is somewhat inferior, but I think the insulated TO-220FP will be the bottleneck in terms of dissipation anyways.
Comment