I just got my first CRO ever. But the seller didn't pack it properly and so the "cal" buttons for chan A & chan B got banged and bent. I've mostly unbent them by pushing sideways the other way but it's not perfect. What's the best way to undo this damage? The buttons still work, they're just off axis.
Another thing is that when I turn it on, it makes a buzzing sound. It's not the 15kHz hum that CRT TVs used to do, it's lower frequency than that. The display lights up and shows a flat line. I can't test it because I have no probes yet, but it turns on and powers the CRT. Is this normal, or is something dying in there and I should investigate?
Also, the CRO reeks of a WD40-like smell. I can't find any evidence of WD40 spraying (was looking for greasy streaks anywhere inside or outside), but when I open it the smells comes out. It's really powerful and bothersome. I tried smelling around, but it's just the general area that smell. Is it how old CROs smell because something inside is off-gasing? Is it a failed/failing component? Or is there a spot that people typically spray with lubricant that I should find and clean to remove the smell?
Finally, I'm attaching a picture of a suspicious component that looks like a capacitor that has leaked. But the component doesn't look anything like a capacitor to me. It's stamped I901-0638, but I couldn't find anything on the Internet with this reference. What is it, should I replace it, and how to find an equivalent? On the schematics, it's on board A16, low voltage power supply, component CR4. It looks like a bridge rectifier, but why would it leak? There is no electrolyte in these as far as I can tell (with my very limited knowledge). I attached the schematics and highlighted CR4.
--edit: I found what I think is CR4 from board A16 in the components list, it just calls it a "diode full wave bridge 100V 5A". When I search for this on eBay, I can't find one that has this long, rectangular shape like on the board...