I have an old 25mhz Heath 4552 oscilloscope that I want to get running properly so I can sell it. Everything appears to be working except Channel A. When I select that input the trace never shows up. It seems as if the vertical position is slammed off the screen since there is a slight glow that can be seen if the room is dark.
I have several other 100mhz scopes and I plan on using one of them to isolate this problem. It would make this a great deal easier if I had the schematic. I noticed some time ago someone had a power supply issue with the same model oscilloscope and a member sent him that section of the schematic from a service manual. I was wondering if someone might have the rest of that manual.
I did see a couple of sites that would sell me a copy, and if I was fixing it for my lab I would go that route, but since I have a new 200mhz digital storage scope on the way, I don't want to spend any money on this one. Heck, if the price to fix this one is too much, I will sell it as-is for about $20.
I have several other 100mhz scopes and I plan on using one of them to isolate this problem. It would make this a great deal easier if I had the schematic. I noticed some time ago someone had a power supply issue with the same model oscilloscope and a member sent him that section of the schematic from a service manual. I was wondering if someone might have the rest of that manual.
I did see a couple of sites that would sell me a copy, and if I was fixing it for my lab I would go that route, but since I have a new 200mhz digital storage scope on the way, I don't want to spend any money on this one. Heck, if the price to fix this one is too much, I will sell it as-is for about $20.
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