![]() ![]() That's basically what I'm asking, Why is it doing this? Then I might have some idea of how to fix it. I have the schematic for it but I cant work out why its arcing across the resistor? Could it be that the fly-back transformer has had the bomb? I have the parts list for this scope but nowhere to order them from? Where I live is fairly remote and the local repair shop cant be trusted to change the battery's in a TV remote.LOL Ive included some photos,one shows the big brown 2 watt resistor that has the arcing across it, next to the fly-back transformer. ![]() ![]() 5v calibration pin? and there's a spark that jumps across a 2 watt resistor in the power supply on start-up and intermittently after? I checked the scope out and found a broken (shattered) plastic voltage adjuster for 100v,120v,220v,230v,on the back next to the power plug.Ive got it set for 230v for here in Aussie land, with the fuse on the yellow 240v wire. 5v square wave when the probe was connected to the. Ive been trying to fix my Hung Chang brand, (Protek 6502 model) scope that I bought second hand (in good working condition)? After it was delivered in the post I noticed that it couldn't get a.
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