Greetings all, I am hoping to get some advice on where to focus on a repair I’m tinkering around with. I have an old hp1742a that I’ve had for several years that worked well except for the delay function. It never worked since I bought it but I never bothered to look into it since I was using the scope and didn’t really need that feature. I’ve since upgraded my stable and this scope is not in use anymore so I figured I’d tinker with it to see if I can repair that issue. I’m not going near any high voltage so if anything points to that portion of the scope I’ll probably wave off and call it a wash. There is a service manual online for the scope but the pdf is pretty unreadable so I ordered a paper copy and am waiting for that to arrive. So, down to the issue. I took the cover off to visually inspect for issues and there was an exploded capacitor on the main sweep integrator card so I cleaned it up a bit and put a new one in. When I powered the unit back on, nothing changed, scope still worked fine but still no delay functionality. So I took the cover off again to look for other issues and didn’t see anything obvious so I closed it back up since I wanted to wait until I had a readable service manual before I continued. When I powered it back up, I found that I had no trace anymore. If I push the beam finder, the test signal shows when the channel is connected to the calibration output but it disappears when I release it. So after all that, does anyone have any suggestions on where to start looking for the fault once I get the service manual? I have basic ee knowledge but not specific scope function so any pointers on where to focus would be appreciated. I’m using this more as a learning experience than anything but it would be nice to be able to fix the scope too. Oh, I did pull the horizontal preamplifier/ horizontal output card out to get access to the blown capacitor and I’m assuming that’s where I flexed something a bit taking the card out if that helps any.
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