One positive point is that there is high voltage. If it were Hung Chang OS-620, that would be easy, I have already repaired several.* But this model, I've never seen it. It seems that there are multiple failures and even problems resulting from attempts at repair. Without service manual or, at the very least, schematics, it seems difficult to repair this oscilloscope. Without the Y, the trace should revert to somewhere center, but it would be easier if it has the 'Find trace' button like the Tektronix scope.
'Visually' as long as the CRT is not meddled with, you should be checking the preamplifier and the vertical amplifier first.Ĭlean the contacts and meddle with the front panel buttons would help, channel 1 or Channel 2, chop or invert etc. If you have a oscilloscope to trace the signal, it would be much easier to troubleshoot the scope. Vertical off the screen, can use the 'common moding' technique. I search the internet but non is available also. I don't have the manual, maybe others have it. If you have not done it before, and not comfortable in dealing with it, then I suggest you ask a friend to help you out with the repair. The scope does carry High voltage and proper discharge and safety technique must be used. You'll need the service manual to proceed far with this unless you've had considerable CRO repair experience but as you have something on the display you're a long way towards getting it sorted. Here's another for the 5504 of which it seems the 5510 is of the same series. Looks suspect but if your antivirus is all up to date it could be worth looking at. On a bit of chase to find Hung Chang manuals I found this dubious link: Clicking on it gives a 620 Kb zipped file that when unzipped offers a link to an 84 Mb Manuals file from. Im not sure if this was from factory or someone troubleshooting:S So what are the chances of repair, and I cant find the correct service manual anywhere:S cheers. Pretty much all the caps are done, either low capacitence, high (some very high) ESR and some up to 40% voltage loss. This also looks like its been attempted to repair before, there is new markings on the various sockets where the baords been taken out and solder points have been re soldered. Ltd., Protek Seoul Here you find 22 models, 22 with images and 9 with schematics for wireless sets etc. The oscilloscope features 2 analog channels, 0 digital channels and runs on a Embedded Operating System. The OS-635 from Hung Chang, part of the OS, is a Benchtop oscilloscope with a maximum bandwidth of 35 Mhz.
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