My dad's poor old Philips PM3070 scope died in a sizzle and a puff of smoke a few days back, after being sat in the garage for a year or so. He donated it to me and it seemed to work at first, but unfortunately it didn't last more than a couple of hours.
Whilst I was taking a photo of my new toy, it started crackling and began exuding some pretty acrid smelling bright-white smoke. The screen remained on whilst this was happening, though I very quickly unplugged it and didn't get to test any functionality. I'm hoping that this indicates a non-fatal fault; it would be a shame to have to commit it to the great electronic beyond.
I've now got it at home and have taken it apart, and pretty quickly discovered the culprit:
Well, no wonder it made such an awful stench! The cap's a bit dead it seems. Since the scale is not immediately obvious: I'd say it's about 22mm across, by 17mm high, by 12mm deep. The traces leading to it are about 2mm wide.
I've got a service manual that shows the circuit diagram as follows. I circled the failed capacitor in red.
(excerpt of circuit used under assumption of fair use allowance)
For clarity, X6014 is a standard Molex connector that brings the 240V mains in from the external plug. S6001 is the main power switch. I don't know a huge amount about power supply design, but I'm going to guess that this is some kind of filter or choke.
I'm looking for a replacement, but don't really know what to look for. I can't tell whether this is a standard cap, or whether it has some special properties specific to its role. I also don't know what current rating I need to look for. Any ideas on what I should be looking for, and how I should come to such a decision?
For example, is this an appropriate replacement? If not, which properties are incorrect?
